Overtraining and glycogen depletion hypothesis

Low muscle glycogen levels due to consecutive days of extensive exercise have been shown to cause fatigue and thus decrements in performance. Low muscle glycogen levels could also lead to oxidation of the branched chain amino acids and central fatigue. Therefore, the questions become, can low muscle...

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Bibliographic Details
Published in:Medicine and science in sports and exercise 1998-07, Vol.30 (7), p.1146-1150
Main Author: Snyder, A C
Format: Article
Language:English
Subjects:
Athletic Injuries - etiology
Bicycling - physiology
Bicycling - psychology
Dietary Carbohydrates - administration & dosage
Energy Metabolism - physiology
Fatigue - etiology
Glycogen - metabolism
Humans
Hydrocortisone - blood
Lactic Acid - blood
Male
Muscle, Skeletal - chemistry
Physical Education and Training - methods
Space life sciences
Stress, Psychological - etiology
Syndrome
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Summary:Low muscle glycogen levels due to consecutive days of extensive exercise have been shown to cause fatigue and thus decrements in performance. Low muscle glycogen levels could also lead to oxidation of the branched chain amino acids and central fatigue. Therefore, the questions become, can low muscle glycogen not only lead to peripheral and central fatigue but also to overtraining, and if so can overtraining be avoided by consuming sufficient quantities of carbohydrates? Research on swimmers has shown that those who were nonresponsive to an increase in their training load had low levels of muscle glycogen and consumed insufficient energy and carbohydrates. However, cyclists who increased their training load for 2 wk but also increased carbohydrate intake to maintain muscle glycogen levels still met the criteria of over-reaching (short-term overtraining) and might have met the criteria for overtraining had the subjects been followed for a longer period of time. Thus, some other mechanism than reduced muscle glycogen levels must be responsible for the development and occurrence of overtraining.
ISSN:0195-9131
DOI:10.1097/00005768-199807000-00020