PMID: 11915777Mar 28, 2002Paper

Three days fast in sportsmen decreases physical work capacity but not strength or perception-reaction time

International Journal of Sport Nutrition and Exercise Metabolism
A GutiérrezM J Castillo

Abstract

This study investigates, in young nonobese healthy athletes, the consequences of a 3-day fast coupled, or not, to enhanced physical activity. Eight male subjects, aged 21+/-2 years, fasted for 3 days on two separate occasions, 4 weeks apart. On the first occasion, subjects continued their daily training activities. On the second occasion, a daily physical exercise program was added to these activities. Subjects were evaluated before and after 24 hours and 72 hours of fasting. Evaluation consisted of body composition, basal respiratory exchange ratio, plasma metabolic parameters, perception-reaction time (both simple and discriminant), hand grip strength, and physical work capacity at 170 beats per minute (PWC170). Fasting determined significant reductions in body weight, body fat, and muscle mass. These reductions were not affected by enhanced physical activity. Basal respiratory exchange ratio decreased with fasting but was not influenced by increased training activities. Fasting determined a significant decrease in blood glucose levels, while plasma proteins, urea, uric acid, and free fatty acids increased. Perception-reaction time and hand grip strength were unmodified during fasting. By contrast, PWC170 was significantly an...Continue Reading

Citations

Dec 12, 2007·European Journal of Applied Physiology·Yoav MeckelAlon Eliakim
Mar 1, 2012·Asian Journal of Sports Medicine·Ho-Heng TianAi-Li Constance Png
Dec 24, 2015·Scientifica·Mahboubeh Ghayour NajafabadiSara Beygi
Apr 22, 2016·Journal of the International Society of Sports Nutrition·Nidhal ZarroukMohamed Dogui
Nov 30, 2018·Journal of Applied Physiology·James L NuzzoSimon C Gandevia
Nov 19, 2003·Perceptual and Motor Skills·Barry S Kendler, Tedd M Keating
Nov 20, 2002·Medicine and Science in Sports and Exercise·Bradley C NindlScott J Montain
Mar 21, 2017·Journal of the American College of Nutrition·Anissa CherifBart Roelands

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