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<strong>Fatigue, aging, and recuperation</strong>
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<hr />- Old people and sick people tire easily. Surprisingly, little is known to explain that common fact.-
Myths about lactic acid and oxygen debt have misdirected most fatigue research.- The cellular processes involved
in fatigue overlap with those of aging.- Knowledge about the mechanisms of fatigue should be useful in
preventing some tissue swelling disorders, organ failure, degenerative calcification, and other energy-related
problems.&nbsp;<hr />GLOSSARY:* Uncoupling--In cellular respiration, oxidation of "fuel" in the mitochondrion is
coupled to the phosphorylation of ADP, forming ATP. Uncouplers are chemicals that allow oxidation to proceed
without producing the usual amount of ATP.* DNP--Dinitrophenol, an uncoupler that was once popular as a
weight-loss drug.* NAD+ and NADH--Nicotinamide adenine dinucleotide, and its reduced form are coenzymes for many
oxidation and reduction reactions in cells.* Hyperammonemia--The presence of too much ammonia in the blood.*
Vicinal water--water near surfaces, especially hydrophobic surfaces, that is physically and chemically different
from ordinary water.* Hydrophobic--insoluble in water, a nonpolar oil-like molecule that repels water.<hr
/>Unlike the somewhat technical medical concept of "stress," the idea of fatigue is something everyone
understands, to some extent. Hans Selye's studies of stress weren't widely accepted until about 40 years after
their publication, but some of the main investigators of the fatigue phenomenon are still practically unknown in
the universities, many years after they published their work.&nbsp;Several things have kept fatigue research
from advancing, including the common feeling that fatigue is already sufficiently understood, and that it is
somehow trivial, compared to problems such as growth, reproduction, and disease.Fatigue is usually described as
decreased responsiveness resulting from over-exertion: For example, a muscle's decreased strength or speed of
contraction, or a nerve's decreased speed of conduction, or a sense organ's decreased ability to detect or to
discriminate. Another meaning of fatigue, a decreased resistance or strength, can be applied to materials, as
well as to some biological functions, for example when fatigue leads to sickness or
infections.&nbsp;"Responsiveness" implies sensitivity, and decreased sensitivity to stimulation can be seen in
fatigued sense organs, nerves, muscles, and many other types of cell--immune cells, secretory cells, etc. Even
plant cells have very similar processes of excitability that can be depleted by repetition.In a series of
lectures to the Royal Society in England (1895-1901), the physicist Jagadis Chandra Bose described work that at
first excited, and then disturbed, many physicists and biologists. He had invented devices for both producing
and detecting electromagnetic waves, and he had been the first to produce millimeter length radio waves
(microwaves). In Marconi's first transatlantic radio transmission Bose's signal detecting device was used. This
device was based on the fact that two pieces of metal in superficial contact became electrically fused (cohered)
in the presence of an electrical or electromagnetic field. After they cohered, a mechanical shock would separate
them, breaking the electrical fusion.When Bose was experimenting with his "self-restoring coherer," a
semiconducting device that spontaneously broke the connection without being mechanically shaken, he observed
that it became insensitive after prolonged use, that is, it lost its self-restoring capacity, but that after a
rest, it recovered its sensitivity. He recognized the complex behavior of his instrument as being very similar
to the electrical physiology of living cells.He then began a series of experiments on plants, animals, and
minerals, that showed similar responses to all kinds of stimulation, including mechanical and thermal and
electromagnetic.The idea of metal fatigue wasn't new, but Bose was able to think far beyond the ideas of the
metallurgists. Biologists were thinking of electrical responsiveness as a defining feature of life, and Bose
demonstrated that plants had electrical responsiveness very similar to that of animals, but also that similar
reactions could be demonstrated in minerals.This was what disturbed the English scientists. Sensitivity,
irritability, fatigue, and memory were supposed to be special properties related to life, and maybe to
consciousness. For the Englishmen, there were religious implications in this Hindu's research.There were several
reasons that European and American scientists couldn't accept the universal nature of the electrical properties
that they were studying in animals. One of their motives was to see life as something immaterial, or of an
absolutely different nature than inorganic matter. Another problem had to do with the developing belief that the
special properties of life were enclosed in the hereditary substance of each cell, and that the electrical
functions of cells were produced entirely by the presence of a membrane, surrounding a drop of water containing
randomly moving dissolved chemicals.&nbsp; For the membrane electricity theory, it was essential to believe in
the random behavior of things dissolved in the cell water.So they considered the electrical-mechanical reactions
and interactions of minerals to be so unlike the processes of life that it was inappropriate to see analogies
between them. Minerals were composed of atoms, and, according to the doctrine of the time, they could have no
"physiological" functions except on the atomic scale. It was more than 20 years before mainstream physicists
began thinking about "delocalized" forces and fields in minerals.&nbsp;Between 1915 and 1934, Michael Polanyi
made many observations that made it clear that the old kind of electrical atomism was completely unfounded. The
behavior of mineral crystals, and the interactions between different phases of material, such as gas or liquid
with a solid, could be understood only in terms of relatively long-range forces. Polanyi's experiments showed,
for example, that events on the surface of a crystal modified the strength and deformability of the
crystal.&nbsp;Many others between 1900 and 1940-- Lepeschkin, Nasonov, Bungenberg de Jong, and Solco Tromp, for
example--argued that the sensitivity of protoplasm had to be understood in terms of long range order, something
like a liquid crystalline state of matter that would require some of the kinds of knowledge of matter that were
being developed by physicists, metallurgists, and a variety of others investigating the condensed states of
matter.But the mainstream biologists preferred to describe cells in terms that would make impossible any of the
responsivities or sensitivities seen in the "simple" solid state of minerals. To defend their ideology of the
immateriality of life, they denied that the subtlest features of matter had anything to do with life, reducing
life to a debased set of special, merely theoretical, mechanisms. The now defunct physical theory of merely
localized atomic electrical forces became the paradigm for the new biology. The many demonstrations of coherent,
ordered physical behavior of the cytoplasm, for example Gurwitch's mitogenic radiation, were dismissed with
prejudice.&nbsp;During G. W. Crile's long career (1889-1941), understanding shock, biological energy, and
fatigue were his main concerns. He believed that shock was the result of brain exhaustion, and in one of his
last publications he showed that the brains from exhausted animals produced less bioluminescence than those from
rested animals. His importance was in demonstrating that fatigue and shock are systemic conditions of the
organism, rather than isolated events in muscles and nerves. Recent publications are showing the validity of
this view. Crile's approach to the prevention and treatment of shock was based on isolating the damaged area
with local anesthetics. Blocking the nerves from one injured part of the body, for example the sciatic nerve in
the leg, could preserve energy production (and normal cell functions) throughout the rest of the body.About 30
years earlier (1901), Vvedensky had demonstrated that some types of fatigue appear to be a defensive blocking of
responsiveness, such that intense stimulation would produce no response, while weak stimulation could sometimes
produce a response. These changes affected cell functions in a variety of ways, that he called narcosis and
parabiosis.There have been two popular ways to "explain" fatigue, one by saying that the cell's energy (usually
thought of as ATP or glycogen) is used up, the other saying that the accumulation of a metabolic product
(usually lactic acid) prevents further functioning. The obvious problem with these explanations is that the
fatigue response is quite independent of those metabolic changes. Another problem is that those ideas don't
explain the real changes that occur in cells that are demonstrating fatigue.Fatigued cells take up water, and
become heavier. They also become more permeable, and leak. When more oxygen is made available, they are less
resistant to fatigue, and when the organism is made slightly hypoxic, as at high altitude, muscles have more
endurance, and are stronger, and nerves conduct more quickly. These facts don't fit with the standard model of
the cell, in which its sensitivity is strictly governed by the behavior of its "membrane." (For example, how can
a membrane leak large molecules at the same time that it is intact and causing the cell to swell osmotically?)
They are consistent with the model of the cell that treats protoplasm as a special phase of matter.Another
feature of fatigue (and often of aging, stress, and sickness) is that the relaxation of muscles is retarded and
impaired.Hypothyroidism causes muscle relaxation to be slowed, both in skeletal muscles and in the heart. F/Z.
Meerson showed that stress causes heart muscles to be exposed to increased calcium, followed by breakdown of
fats and proteins, and that these changes keep the injured heart in a continuous state of partial contraction,
making it stiff, and resistant to complete contractile shortening. When many cardiologists talk about the
heart's stiffness, they are thinking of muscular thickening and fibrosis, but those are late consequences of the
kind of contractile, unrelaxed stiffness that Meerson described.The hypothyroid heart does eventually become
fibrotic, but before that, it is just unable to relax properly, and unable to contract fully. This failure to
empty fully with each contraction is a kind of "heart failure," but it can be corrected very quickly by
supplementing thyroid. Even the fibrotic heart can recover under the influence of adequate thyroid.The analogy
of the "coherer" would suggest that the overstimulated muscle isn't able to decohere itself, until it has had a
rest. It responds to stimulation, lets the energy flow, but then can't turn it off, and the energy keeps
flowing, because of a change in physical state.&nbsp;Albert Szent-Gyorgyi was probably the first person to
seriously investigate the semiconducting properties of living material. Since he was aware of W.F. Koch's idea
of a free radical catalyst to support oxidative metabolism, his suggestion in 1941 that cellular proteins could
function as electrical conductors (or semiconductors) was very likely based on his research in cellular
respiration, as well as on his work with muscle proteins. He had observed that ATP lowers the viscosity of a
solution of the muscle protein myosin, and that it would cause a filament formed by precipitating myosin to
contract. The polymerization and contraction of proteins under the influence of free radicals was at the heart
of F.W. Koch's therapeutic ideas, but Koch's work was about 100 years too early, by medical
standards.Szent-Gyorgyi observed that, although ATP was involved in the contraction of muscles, its post-mortem
disappearance caused the contraction and hardening of muscles known as rigor mortis. When he put hardened dead
muscles into a solution of ATP, they relaxed and softened. The relaxed state is a state with adequate energy
reserves.After Szent-Gyorgyi moved to the U.S., in 1947, he demonstrated the effect of muscle cytoplasm on the
behavior of fluorescent substances, which was analogous to that of ice, until the muscle was stimulated. During
contraction, the fluorescent material behaved as it would in ordinary liquid water. This effect involved the
stabilization of the excited state of electrons. This single demonstration should have caused biologists to
abandon the membrane theory of cellular excitation, and to return to basic physics for their understanding of
cell behavior. The implications of Szent-Gyorgyi's work were enormous for biology and medicine, and even for the
understanding of semiconductors, but most of the world was hypnotized by a simple textbook model of cell
membranes.Szent-Gyorgyi also demonstrated that the combination of properly balanced electron donors and electron
acceptors (D-A pairs) would cause a muscle to contract. He compared this to "doping" an inorganic
superconductor, to regulate its electronic behavior. Although these experiments were done half a century after
Koch's application of free radical chemistry to medicine, they still didn't rouse the pharmaceutical industry
from its toxic slumber.I suspect that it was Szent-Gyorgyi's research with those interesting electronic
properties of cellular water and proteins that in 1960 gave Linus Pauling the idea to explain anesthesia,
specifically noble gas anesthesia, in terms of water clathrate formation, the restructuring of cellular water by
the hydrophobic atom or molecule of an anesthetic. His suggestion caused a reaction among biologists that
discouraged research into the subject for about 40 years.Gilbert Ling's view of cytoplasmic structure gives a
different emphasis to the function of electrons, which I think is an essential complement to Szent-Gyorgyi's
view. Ling's emphasis is on how the inductive effect of adsorbed substances (for example, ATP and progesterone
has powerful adsorptive effects) on proteins changes the charge concentration on ionizable groups. When the
charge concentration is in one configuration (more acidic), the preferred counterion is potassium, and in
another (less acidic) configuration, it is sodium.&nbsp;Gilbert Ling's biophysical calculations were useful to
physical chemists, and were soon put to practical use for understanding ion exchange resins, such as water
softeners. Many sorts of evidence showed their validity for cell physiology, but nearly all biologists rejected
them, preferring to talk about membranes, pumps, and channels, despite the evidence showing that the properties
ascribed to those are simply impossible. NMR imaging (MRI) was developed by Raymond Damadian specifically as an
application of Ling's description of cell physiology.Although metals are conductors, the function of the
coherers of Bose and others shows that the surface is a semiconductor, that requires the slight excitation of an
electromagnetic wave to become conductive, at which point the conduction band of electrons in the metal becomes
coherent and extends from one particle into the others. The surface of any phase of a substance has electronic
properties distinct from those of the bulk phase, and in a sense the interface constitutes a special phase of
matter.&nbsp; When the electrons of the interface lose their special properties, the structure of the whole
system changes.When a muscle cell is stimulated enough to cause a contraction, the interruption of its resting
phase causes a shift in the charge concentration on the proteins, potassium ions are exchanged for sodium ions,
calcium ions enter, and phosphate ions separate from ATP, and are replaced by the transfer of phosphate to ADP
from creatine phosphate.&nbsp;Since the quantum physicist E. Schroedinger wrote his book, Time's Arrow, people
have often thought of life in terms of negentropy, going against the general tendency of entropy to increase,
except for aging and death, which are seen as obeying a law of increasing entropy. But A. Zotin investigated
organisms, rather than abstractions about electrons, and shows that aging involves a decrease in entropy, and a
slowing of metabolism. The decrease of entropy with aging, according to his view, would be analogous to
crystallization, a sort of progressive freezing.When a nerve is stimulated, it releases energy suddenly, and
much of this heat seems to be the result of a change of structure in the cytoplasm, since (in crustaceans'
nerves, which can function at low temperature) during the resting recovery of the nerve, its temperature goes
slightly below the ambient temperature, despite the release of some heat from the chemical changes of
metabolism, stimulated by the nerve's activity.&nbsp;When a physical change is endothermic, as the nerve's
recovery is, that can be interpreted as an increase in overall entropy, as when a rubber band spontaneously
contracts, and becomes cooler.Bose's rested coherer, which, with time, spontaneously recovered its
semiconductive (i.e., relatively insulating) property, wasn't being powered by metabolism. As the particles
returned to their relatively isolated state, there was a decrease of order, and the change was probably somewhat
like the spontaneous energy change in the stimulated crustacean nerve. I assume the change would result from the
absorption of environmental heat, possibly with infrared resonance with electron conduction bands.Seeing the
structure of the cytoplasm as something like a spring-driven mechanism, able to bounce between two states or
"phases," makes it easier to see cellular fatigue as something different from the various metabolic energy
sources, ATP, glycogen, and oxygen, which--contrary to conventional assumptions--aren't closely tied to the
functional losses occurring in fatigue.The role of metabolism, then, becomes analogous to the role of the
"tapper" in the early forms of the coherer.Water in its normal state is a dielectric. But when it is polarized
by an electrical charge, or by the presence of a phase boundary, its normal state is altered. This is the
special interfacial water, or vicinal water. With the movement of ions (mainly potassium, sodium, calcium, and
magnesium) during excitation, the state of the cellular water is necessarily changed by the presence of
different substances. In the excited state, cell water is less hydrophobic, more hydrophilic than in the relaxed
state. A network of "hydrophobic" interactions extends through the relaxed cell. One of the properties of a
dielectric is that it tends to move into the space between charges, with a force similar in principle to that
involved in dielectrophoresis.&nbsp;In the resting state, potassium is the main inorganic ion, and it is
associated with acidic groups, such as aspartic and glutamic acid. During excitation, potassium is partly
exchanged for sodium, which becomes the preferred counter-ion for the acid groups, and calcium enters the cell
along with the sodium. Potassium's interaction with water is very weak (its hydration has been called negative),
allowing water to form the structures that are stable in the presence of hydrophobic surfaces. Sodium and
especially calcium (smaller atoms, with higher surface charge concentration) powerfully interact with water
molecules, more strongly than water interacts with itself, disrupting the delicate somewhat hydrophobic
structures of the intracellular water.(Calcium, with its two charges, has important binding and stabilizing
functions in the resting cell. In the excited cell, these internal calcium ions are released, while
extracellular calcium ions enter the cell.)With the increased movement of charged particles during the
stimulation of a nerve or muscle, as one kind of counterion is exchanged for another, and the destruction of
some of the water's structure, there are more opportunities for bulk dielectric water to enter cells,
interfering with the arrangement of proteins, and tending to cause swelling and separation of the structural
elements of the cell. Electron micrographs of fatigued muscle show a remarkable separation of the actin and
myosin proteins.In the excited state, NMR studies show that cell water behaves more like bulk water, that is,
its molecular movements are relatively free, indicating the momentary loss of the interfacial state. In this
state, the uptake of water, and the fatigue-related swelling of nerves and muscles, would be driven at least
partly by the principle that a dielectric tends to be pulled into the spaces separating charges. The bulk water
that enters a cell during the breakdown of vicinal water functions as an extraneous material somewhat beyond the
cell's control.These bulk-like high dielectric properties of water in the excited cellular state can explain
many changes of enzyme activity. Previously nonpolar lipids would develop a negative surface charge (from
accumulating hydroxyl groups: Marinova, et al., 1996), which would tend to increase their oxidation and
degradation. With the loss of the interfacial water, the cell's high energy resting state is replaced by an
active mobilization of its resources, to maintain and restore the cell's structure. Metabolic energy begins to
flow into the processes of restoration, serving the function of the tapper in the earliest coherers.Looking at
fatigability, muscle contraction, and nerve conduction in a variety of situations, we can test some of the
traditional explanations, and see how well the newer "bioelectronic" explanations fits the facts. Osmotic
pressure, hydrostatic pressure, atmospheric pressure, and the degree of metabolic stimulation by thyroid hormone
affect fatigue in ways that aren't consistent with the membrane-electrical doctrine.The production of lactic
acid during intense muscle activity led some people to suggest that fatigue occurred when the muscle wasn't
getting enough oxygen, but experiments show that fatigue sets in while adequate oxygen is being delivered to the
muscle. Underwater divers sometimes get an excess of oxygen, and that often causes muscle fatigue and soreness.
At high altitudes, where there is relatively little oxygen, strength and endurance can increase.An excess of
oxygen can slow nerve conduction, while hypoxia can accelerate it. (Increasing the delivery of oxygen at higher
pressure doesn't increase the cellular use of oxygen or decrease lactic acid production in the exercising muscle
[Kohzuki, et al., 2000], but it will increase lipid peroxidation.)High hydrostatic pressure causes muscles to
contract, though for many years the membrane-doctrinaires couldn't accept that. Underwater divers experience
brain excitation under very high pressure. Since vicinal water has a larger volume than ordinary water
(analogous to the expansion when ice is formed, though the volume increase in cell water is slightly less, about
4%, than in ice, which is 11% more voluminous than liquid water), compression under high pressure converts
vicinal cell water to the state that occurs in the excited cell, the way ice melts under pressure. The excited
state exists as long as water remains in that state.These changes of state under pressure are reminiscent of
Bose's use of pressure in some of his coherers, and of the fact that pressure alters the sensitivity of
electrons in a semiconductor, by altering their "band gap," the amount of energy needed to make them enter the
conductive zone.One of the early demonstrations that cell water undergoes a phase change during muscle
contraction involved simply measuring the volume of an isolated muscle. With stimulation and contraction, the
volume of the muscle decreases slightly. (The muscle was immersed in water in a sealed chamber, and the volume
decrease in the whole chamber was measured.)&nbsp; This corresponds to the conversion of vicinal water to
bulk-like (dielectric) water.&nbsp; (The threatening implications of those experiments with spontaneous volume
change were very annoying to many biologists of my professors' generation.)In the stimulated state, the cell's
uptake of water from its environment coincides closely with its electrical and thermal activity, and its
expulsion of water coincides with its recovery. In a small nerve fiber, or near the surface of a larger fiber,
these changes are very fast, and in a large muscle the uptake of water is faster than the flow of water from
capillaries can match, but it will become massive if stimulation is continued for several minutes. For example,
two minutes of stimulation can cause a muscle's overall weight to increase by 6%, but its extracellular
compartment loses 4%, so the muscle cells gain much more than 6% of their weight in that short time (Ward, et
al., 1996). The water that is taken up by cells is taken from the blood, which becomes relatively dehydrated and
thicker in the process.The belief in "semipermeable membranes" (which hasn't been a viable explanation of cell
physiology for a very long time) forces people to explain cell swelling osmotically, which means that they
simply assume that the number of solute particles inside the cell has drastically increased in a very short
time. In Tasaki's experiments (1980, 1981, 1982), the swelling in a nerve coincides with the electrical action
potential, which, according to the osmotic explanation, means that a very large increase in internal osmolarity
happened in essentially no time. The action potential comes and goes in about 2 milliseconds. The swelling also
coincides with heat production and shortening of the nerve fiber. The shrinkage of the nerve fiber after the end
of the action potential may be just as rapid, and the membrane theory offers no explanation for that, either.
(But the restoration of the unswollen state can be very prolonged, depending on conditions extrinsic to the
particular muscle or cell.) Troshin's survey of the theory of osmotic regulation of cell volume showed that the
idea of the cell as a membrane osmometer was false, but very few biologists read his book.Since the excited or
fatigued muscle or nerve swells and gains weight, it's interesting to see what happens to their sensitivity and
strength when they are exposed to hypotonic solutions that tend to promote swelling, or to hypertonic solutions,
that help to prevent swelling.In a hypotonic solution, cells are excited (Lang, et al., 1995: "Exposure of
aortic strips from guinea-pigs to hypotonic extracellular fluid is followed by marked vasoconstriction..."), but
the early excitation is followed by decreased responsiveness (Ohba, et al., 1984: "Exposure of muscle to
hypotonic solutions [70% of normal solution] produced initially a transient increase in twitch after which
twitch declined below the control level"). Hypertonic solutions tend to produce relaxation in normal muscles,
including the aorta (Tabrizchi, 1999), but when muscle function is impaired (especially in the circulatory
system, as in shock) they improve contractile function (Elgjo, et al., 1998: "The maximum contraction force
measured in isolated right papillary muscles ex vivo was significantly greater in HSD-treated than normal
saline-treated animals"). Athletes can lose 4% of their weight by dehydration without decreasing their muscular
strength.Hypothyroidism tends to cause loss of sodium from the blood, and the hyponatremia sometimes leads to a
generalized hypotonicity of the body fluids. The thyroid hormone itself functions as an antioxidant, but much of
its protective effect against cell damage is probably the result of preventing cell swelling and accelerating
the removal of calcium from the cell. (Swelling, like fatigue, causes intracellular calcium to increase.)The
electrical surface charging of lipids in bulk water probably accounts for the increased lipid peroxidation that
occurs in fatigue, edema, and hypothyroidism, when water loses its normal partial hydrophobicity. Increased
carbon dioxide is known to decrease lipid peroxidation, and its production requires adequate thyroid
function.Thyroid stimulation of oxygen consumption tends to prevent lactic acid production, because it keeps the
cytoplasm in a state of relative oxidation, i.e., it keeps the concentration of NAD+ hundreds of times higher
than that of NADH. NADH is required for the conversion of pyruvate to lactate. It is also the source of reducing
potential in many kinds of toxic redox cycling, that generate lipid peroxides, and it maintains the sulfhydryl
system, involving the balance of reduced glutathione with the sulfhydryl-disulfide system of protein bonds,
which governs the cell's electronic state and affects its balance of hydrophobicity and hydrophilicity.The
harmful lipid oxidation interferes with energy production and regulatory processes, and is responsible for some
of the prolonged effects of fatigue, swelling, and hypothyroidism. These lingering effects of lipid oxidation
are undoubtedly amplified by the presence of larger amounts of unstable polyunsaturated fats, as the energy
demands of the fatigued state mobilize free fatty acids from the tissues.&nbsp;One of the oldest tests for
hypothyroidism was the Achilles tendon reflex test, in which the rate of relaxation of the calf muscle
corresponded to thyroid function--the relaxation is slow in hypothyroid people. Water, sodium and calcium are
more slowly expelled by the hypothyroid muscle. Exactly the same slow relaxation occurs in the hypothyroid heart
muscle, contributing to congestive heart failure, because the semi-contracted heart can't receive as much blood
as the normally relaxed heart. The hypothyroid blood vessels are unable to relax properly, contributing to
hypertension. Hypothyroid nerves don't easily return to their energized relaxed state, leading to insomnia,
paresthesias, movement disorders, and nerves that are swollen and very susceptible to pressure damage.&nbsp;With
aging, hypothyroidism, stress, and fatigue, the amount of estrogen in the body typically rises. Estrogen is
catabolic for muscle, and causes systemic edema, and nerve excitation. It weakens muscle contraction in the
bladder, although it lowers the threshold for stimulation of sensation and contraction (Dambros, et al., 2004).
This is the pattern that causes people to wake up frequently, to pass a small amount of urine. (Progesterone has
the opposite effect in the urinary bladder, raising the threshold of response, but strengthening contraction, as
it does in the gallbladder.) Estrogen lowers stimulation threshold in the gallbladder, as it does in the brain.
Part of its excitatory action might be the result of increased hypotonic tissue water, but its effects on nerve
thresholds are practically instantaneous.&nbsp;In 1971 and '72, I gave some of the reasons for thinking that
estrogen's biological effects result from its direct effects on cell water, causing it to become more like bulk
(high dielectric) water. For example, NMR (spin echo) of estrogen treated uterus and of the uterus from an old
animal were closer to bulk water than that of a young animal. Estrogen, like fatigue or excessive oxygen, slows
nerve conduction.Lactic acid production increases with fatigue, aging, hypothyroidism, estrogen excess, and
other inefficient biological states. Its presence, when oxygen is available, indicates that something is
interfering with efficient oxidative energy metabolism. Ammonia, free fatty acids, and various inflammatory
cytokines are also likely to increase in those stress states.A dangerously high level of ammonia in the blood
(hyperammonemia) can be produced by exhaustive exercise, but also by hyperbaric oxygen (or a high concentration
of oxygen), by high estrogen, and by hypothyroidism. It tends to be associated with an excess of lactic acid,
probably because ammonia stimulates glycolysis. Excess oxygen, like hypothyroidism, is equivalent to
"hyperventilation," in producing an abnormally low level of carbon dioxide in the blood. The Krebs cycle, during
stress, is limited by the unavailability of carbon dioxide. These factors result in the waste of glucose,
turning it into lactic acid, rather than carbon dioxide and energy. In these ways, the metabolism of fatigued
muscle (or any cell under stress) is similar to tumor metabolism.Hyperammonemia disturbs excitatory processes,
and can cause seizures, as well as stupor, and is probably involved in mania and depression. Lithium happens to
complex electronically with ammonia, and I think that accounts for some of its therapeutic effects, but carbon
dioxide is the main physiological factor in the elimination of ammonia, since it combines with it to form urea.
The changes in cell water in the excited/fatigued state represent an increase in the water's "structural
temperature," and that would imply that less carbon dioxide could remain dissolved during excitation.Eating
sugar and using caffeine, which increases the oxidation of sugar (Yeo, et al., 2005), can reduce fatigue, both
subjectively and objectively. Metabolically, they increase the production of carbon dioxide. Increasing sugar
decreases the liberation and use of fatty acids, and by a variety of mechanisms, helps to lower the production
of ammonia, lactate, and inflammatory cytokines. (Lactic acid, in combination with acidosis and free
phospholipids, can interfere with efficient cell functions [Pacini and Kane, 1991; Boachie-Ansah, et al.,
1992].) Free fatty acids release tryptophan from albumin, contributing to the formation of serotonin, which
increases the sense of fatigue.Aspirin and niacin help to prevent fatigue symptoms, and to prevent many of the
harmful systemic oxidative after-effects. (Both are antilipolytic; aspirin uncouples mitochondria.)Uncoupling of
mitochondrial oxidative metabolism from ATP production helps to consume the sugar which otherwise would be
diverted into lactic acid, and converts it into carbon dioxide instead. Mild hypoxia, as at high altitude,
suppresses lactic acid production ("the lactate paradox"), and increases the amount of carbon dioxide in
tissues.&nbsp;Aspirin and thyroid (T3) increase uncoupling. A drug that used to be used for weight reduction,
DNP, also uncouples mitochondrial metabolism, and, surprisingly, it has some of the beneficial effects of
thyroid and aspirin. It stimulates the consumption of lactic acid and the formation of carbon dioxide.The
squirrel monkey, which on average weighs about 2 or 3 pounds as an adult, lives much longer than other mammals
of its size, usually about 20 years, as long as 27. It has an extremely high rate of oxygen consumption. This is
probably the result of natural uncoupling of the mitochondria, similar to that seen in long-lived mice. Mice
with 17% higher resting oxygen consumption lived 36% longer than slow respiring mice of a related strain
(Speakman, et al., 2004).Living at a high altitude, people tend to eat more and stay leaner than when they live
near sea level. Apparently, their mitochondria are relatively uncoupled, and they have more mitochondria, which
would partly account for their lower production of lactic acid during muscular exertion. Increased thyroid
activity, too, tends to increase mitochondrial mass, as well as their uncoupling.Most of the things that we
think of as fatigue result from disturbances of the hydration of cells, whose sensitivity, composition, and
structure change according to the extent of the disturbance. The hydration is governed by the cells'
"electrical" properties, which are regulated by internal metabolic processes and by systemic processes. When
cellular fatigue reaches a certain point, only the interactions of all the organs can restore stable cellular
structure and functions. The liver eliminates lactic acid and ammonia, the adrenals and gonads provide
stabilizing steroids, and the brain alters activity and behavior, in ways that can reverse most of the effects
of fatigue.But, when the tissues contain large amounts of polyunsaturated fats, every episode of fatigue and
prolonged excitation leaves a residue of oxidative damage, and the adaptive mechanisms become progressively less
effective. When the most powerful adaptive mechanisms, such as the timely synthesis of progesterone,
pregnenolone, DHEA, T3, and the inhibitory transmitters, GABA and glycine, fail, then some of the primitive
defense mechanisms will become chronically activated, and even sleep may fail to restore normal cellular water
and metabolism. Hyperventilation often becomes a problem, making capillary leakiness worse.Water in the body
occupies three major compartments--blood vessels, extracellular matrix, and the moist cell substance itself--and
its condition in each compartment is a little different, and subject to variation. There are no textbooks in use
in the U.S. that treat intracellular water scientifically, and the result is that physicians are confused when
they see patients with edema or with disturbances in blood volume. It rarely occurs to physicians to consider
disturbances of water distribution in problems such as chronic fatigue, fibromyalgia, sleep disturbances,
frequent urination, slow bladder emptying, anxiety, paresthesia, movement disorders, the tunnel syndromes, or
even slowed thinking, but "intracellular fatigue" leading to over-hydration is probably the central problem in
these, and many other degenerative and inflammatory problems.&nbsp;The improvements in cell functions and water
distribution that are inversely related to oxygen pressure, and directly related to carbon dioxide, won't be
discussed in medical textbooks until they have given up the idea of membrane-regulated cells.&nbsp;The
"treatment" for intracellular fatigue consists of normalizing thyroid and steroid metabolism, and eating a diet
including fruit juice, milk, some eggs or liver, and gelatin, assuring adequate calcium, potassium sodium, and
magnesium, and using supplements of niacin-amide, aspirin, and carbon dioxide when necessary. Simply increasing
carbon dioxide decreases lactic acid and ammonia, increases GABA (the sleep improving nerve inhibitor), and
regulates mineral and water disposition.One of the outcomes of the study of the physiology of fatigue is that it
leads to a better understanding of cells in general, and offers some new insights into aging, inflammation, and
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