PHYS30005 Lecture Notes - Lecture 5: Glycogen, Glycogen Phosphorylase, Reactive Nitrogen Species

• School: University of Melbourne
• Department: Physiology
• Course: PHYS30005
• Professor: Professor

Document Summary

Force loss during a sustained max. voluntary contraction. Subject attempted to maintain a maximal contraction of quadriceps muscle w/ visual feedback of force record and with verbal encouragement. Imply some physical activity but not always eg. mentally taxing but little physical effort. Fatigue presents differently in different conditions: hot and humid vs. cool and dry. **need to be clear about which aspect is under consideration ie. sensations and perceptions of exhaustion or changes in muscle function. Extent of fatigue may vary according to method of testing. Changes in function may appear greater for voluntary contractions than for tetanic (electrical) stimulation. May differ if muscle is tested at one frequency of stimulation than another. Whether a muscle is isometric or shortening. **in each situation, need to identify the type of change in muscle function that is being described as fatigue". Defined as loss of maximum or potential performance.