Chapter 14

an explanation of muscle fatigue in terms of the building up of metabolites such as lactate, hydrogen ions, inorganic phosphate, and ammonia, within muscle fibers

a decrease in motor performance due to mechanisms proximal to the motor neurons

a model postulating that the central nervous system regulates exercise performance to ensure that physiological failure does not occur during normal exercise

a possible explanation of muscle fatigue; involves the concept of the depletion of glycogen, glucose, or phosphagen stores

the state following a period of mental or bodily activity characterized by a lessened capacity for work and reduced efficiency of accomplishment, usually accompanied by a feeling of weariness, sleepiness, or irritability; may also supervene when, from any cause, energy expenditure outstrips restorative processes

the exhaustion or emptying of stored glucose (glycogen) as a result of long duration activities such as distance running or cycling

a transient decrease in muscular performance usually seen as a failure to maintain or develop a certain expected force or power output

a decrease in motor performance due to mechanisms in the motor units

the exhaustion or emptying of phosphocreatine (PC) stores and extensive reduction of adenosine triphosphate (ATP) as a result of very high intensity physical activity

fatigue experienced by long-distance runners at approximately 18 to 20 miles, probably caused by glycogen depletion in the quadriceps

the fact that more work can be produced after a pause with diverting activity than after a passive rest pause

a model that suggests the cause of neuromuscular fatigue is dependent upon the characteristics of the exercise task that is being performed