31 May '13, 3pm

Does "afferent" feedback from muscle to brain explain exhaustion? I'm not convinced...

Does "afferent" feedback from muscle to brain explain exhaustion? I'm not convinced...

My take? This view of afferent feedback from muscle to brain playing a role in fatigue seems eminently reasonable and intuitive. That being said, I'm not particularly convinced that they've entirely eliminated other possible explanations. They only very briefly acknowledge the potential role that afferent feedback from other parts of the body -- like the heart and lungs -- could play (heart rate at the start of the second exercise session was over 130 bpm, for example), as well as the possible role of cognitive demand (it takes effort and concentration to exercise to exhaustion, and numerous recent studies have shown that these are finite and depletable quantities). The scientific debate seems to involve a lot of "either-or" thinking, but I suspect the eventual conclusion will be more along the lines of "all (or at least many) of the above."

Full article: http://www.runnersworld.com/race-training/muscle-feedback...

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