Carbohydrate Supplementation and Resistance Exercise Performance in Males Undergoing Energy Restriction
Year: 1997
Type: dissertation
Abstract: Athletes frequently reduce their caloric intake to lower their body weight. Wrestlers need to make a weight class, runners want to reduce the energy cost of exercise, and body builders are interested in appearance and reducing subcutaneous fat. This reduction in caloric intake may negatively influence resistance exercise performance. When a group of body builders decreased their body weight by 7.3 kg over 12 weeks, maximal isometric dead-lift force decreased significantly (3). Our laboratory has shown that short-term energy restriction can result in significant reductions in muscle endurance of resistance trainers (34) and in intermittent anaerobic performance in wrestlers (35). This decrease in anaerobic performance may be associated with a decrease in muscle glycogen after energy restriction.. It is possible that a reduction in muscle glycogen that could occur with energy restriction may mediate impaired performance because resistance exercise uses muscle glycogen as a fuel (23,30). Blood cortisol levels may be higher in athletes undergoing energy restriction. Significant increases in cortisol levels have been reported in fasting subjects (3, 4, 8, 32). Resistance exercise has also been reported to increase cortisol levels (20, 21, 25). Combining
Source: VTechWorks (Virginia Tech)
Author: Renee A. Dalton
Language: English
Subfield: Nutrition and Dietetics
Field: Nursing
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2583393741