Carbohydrate supplementation during prolonged intermittent exercise in endurance trained women
Abstract
The effect of carbohydrate supplementation on performance following prolonged intermittent exercise in women was evaluated in this study. Seventeen endurance trained women completed a 6% carbohydrate beverage trial (0.6g.kg-1 ·hr-1) and placebo trial (double-blind and counterbalanced) separated by one month (follicular phase). Trials consisted of four 20 min steady state (SS) running bouts (70%VO2max) separated by 5 min rest and a subsequent 5k time trial (TT). Beverages were ingested during rest periods. Blood samples obtained during each SS bout and upon TT completion were analyzed for glucose, glycerol, and lactate concentration. Participants ran the TT significantly faster with carbohydrate (Mean±SE=7.06±0.28 mph) versus placebo (6.85±0.24 mph) (P<0.03). Glycerol concentration but not RER was significantly lower at 80 min with carbohydrate (0.31±0.04 mmol·l-1) versus placebo (0.36±0.03 mmol·l -1). Carbohydrate supplementation did not differentially shift SS substrate metabolism, but significantly improved average 5k running speed when preceded by 80 min of intermittent running.
Degree
M.S.
Advisors
Sedlock, Purdue University.
Subject Area
Kinesiology|Physiology
Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server.