Title page for ETD etd-7697-22201


Type of Document Master's Thesis
Author Dalton, Renee A. III
Author's Email Address redalton@vt.edu
URN etd-7697-22201
Title Carbohydrate Supplementation and Resistance Exercise Performance in Males Undergoing Energy Restriction
Degree Master of Science
Department Human Nutrition, Foods, and Exercise
Advisory Committee
Advisor Name Title
Rankin, Janet L. Walberg Committee Chair
Sebolt, Don R. Committee Member
Webb, Kenneth E. Jr. Committee Member
Keywords
  • carbohydrate supplementation
  • resistance exercise
  • energy restriction
  • cortisol
  • creatine kinase
Date of Defense 1997-07-25
Availability unrestricted
Abstract
CARBOHYDRATE SUPPLEMENTATION AND RESISTANCE EXERCISE PERFORMANCE IN MALES UNDERGOING ENERGY RESTRICTION

Renee Dalton

(Abstract)

This study examined the effects of carbohydrate supplementation on resistance exercise performance, cortisol levels, and creatine kinase levels in trained males undergoing energy restriction. Sixteen experimental subjects were randomly assigned to a carbohydrate (C, n=8) or placebo group (P, n=8). The remaining six subjects served as controls (N). Performance tests were done before (Trials 1 and 2) and after (Trial 3) energy restriction. Experimental subjects consumed a low calorie formula diet for three days (18 kcal-1 kg-1 d-1). They had blood drawn before and after T2 and T3. For T3, they consumed either a carbohydrate (1g kg-1) or a placebo beverage 30 minutes before exercise.

There was a significant increase in resting cortisol levels following energy restriction.

CK levels were significantly elevated after exercise, suggestion muscle damage. Carbohydrate supplementation had no effect on blood glucose, cortisol, creatine kinase, or RPE. The number of repetitions performed during the final set of bench press showed significant interaction between groups and time. P and N increased the number of repetitions performed from T2 to T3 (15.0 + 1.4 to 17.3 + 0.8 for P, 15.0 + 2.7 to 16.7 + 2.3 for N). C decreased the number of repetitions performed 17.6 + 0.7 to 17.3 + 1.0). The number of repetitions performed during the final set of leg extensions showed no interaction between groups and time (p=0.801). This study did not support a benefit of consuming carbohydrate prior to resistance exercise for dieting athletes but illustrates that energy restriction increases a catabolic hormone.

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