The relationship of selected physiological and hormonal variables on resting metabolic rate in college wrestlers following dehydration and subsequent rehydration

Il Young Paik, Purdue University

Abstract

The purpose of this study was to examine the effects of acute passive thermal dehydration and temperature elevation on metabolic rate in college wrestlers. Secondary purposes include the study of hormonal responses, core temperature changes, and plasma volume changes. Subjects (N = 7) were tested under 4 different treatment conditions: treatment 1 (dehydration and elevated temperature), treatment 2 (no dehydration and elevated temperature), treatment 3 (dehydration and no elevated temperature), and treatment 4 (no dehydration and no elevated temperature). Each treatment required 2 days of testing which included 2 measurements of resting metabolic rate and 4 measurements of metabolic rate. Hematocrit changes, hemoglobin changes, plasma volume change, thyroid hormones (total T4, free T4, and total T3), cortisol, and ADH (Vasopressin) level change were measured at each metabolic measurement. Significant interactions were found between temperature and repeated measurement at the various treatments. No significant interactions were found between dehydration and repeated measurement at various treatments. Significant changes in core temperature occurred one hour during the post elevated temperature treatments. Subjects' plasma volume changes data revealed that there were no uniform pattern of plasma volume changes between subjects. There was no significant difference in total T4 level change among the treatments. However, there were significant difference in free T4 and Total T3 level change among the measurements. There was a significant difference in cortisol level change among the measurements. Analysis of variance of ADH showed that temperature and dehydration were the main factors that differentiate the ADH level throughout the measurements. Also, there was a significant difference in ADH level change among the measurements. It was concluded that when wrestlers are subjected to $2{1\over2}$ hours of passive thermal stress temperature elevation become the major factor that changes in metabolic rate. It was also found that the thyroid hormones, cortisol, and ADH support the temperature, metabolic rate, and dehydration findings.

Degree

Ph.D.

Advisors

Corrigan, Purdue University.

Subject Area

Nutrition|Anatomy & physiology|Animals|Physical education

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