title: Effect of hydration state on resistance exercise-induced endocrine markers of anabolism, catabolism, and metabolism.
abstract: Hypohydration (decreased total body water) exacerbates the catabolic hormonal response to endurance exercise with unclear effects on anabolic hormones. Limited research exists that evaluates the effect of hypohydration on endocrine responses to resistance exercise; this work merits attention as the acute postexercise hormonal environment potently modulates resistance training adaptations. The purpose of this study was to examine the effect of hydration state on the endocrine and metabolic responses to resistance exercise. Seven healthy resistance-trained men (age = 23 +/- 4 yr, body mass = 87.8 +/- 6.8 kg, body fat = 11.5 +/- 5.2%) completed three identical resistance exercise bouts in different hydration states: euhydrated (EU), hypohydrated by approximately 2.5% body mass (HY25), and hypohydrated by approximately 5.0% body mass (HY50). Investigators manipulated hydration status via controlled water deprivation and exercise-heat stress. Cortisol, epinephrine, norepinephrine, testosterone, growth hormone, insulin-like growth factor-I, insulin, glucose, lactate, glycerol, and free fatty acids were measured during euhydrated rest, immediately preceding resistance exercise, immediately postexercise, and during 60 min of recovery. Body mass decreased 0.2 +/- 0.4, 2.4 +/- 0.4, and 4.8 +/- 0.4% during EU, HY25, and HY50, respectively, supported by humoral and urinary changes that clearly indicated subjects achieved three distinct hydration states. Hypohydration significantly 1) increased circulating concentrations of cortisol and norepinephrine, 2) attenuated the testosterone response to exercise, and 3) altered carbohydrate and lipid metabolism. These results suggest that hypohydration can modify the hormonal and metabolic response to resistance exercise, influencing the postexercise circulatory milieu.
authors.affiliation: Dept. of Kinesiology, California State Univ., Fullerton, CA 92834, USA. djudelson@fullerton.edu
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Judelson
authors.forename: Carl M
authors.initials: CM
authors.lastname: Maresh
authors.forename: Linda M
authors.initials: LM
authors.lastname: Yamamoto
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Farrell
authors.forename: Lawrence E
authors.initials: LE
authors.lastname: Armstrong
authors.forename: William J
authors.initials: WJ
authors.lastname: Kraemer
authors.forename: Jeff S
authors.initials: JS
authors.lastname: Volek
authors.forename: Barry A
authors.initials: BA
authors.lastname: Spiering
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Casa
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Anderson
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D015415:Biomarkers / Q000097:blood; D001835:Body Weight; D050260:Carbohydrate Metabolism; D003681:Dehydration / Q000378:metabolism / Q000503:physiopathology*; D004734:Energy Metabolism; D015444:Exercise; D018882:Heat Stress Disorders / Q000503:physiopathology; D006728:Hormones / Q000097:blood*; D006801:Humans; D050356:Lipid Metabolism; D008297:Male; D008660:Metabolism; D009119:Muscle Contraction; D013997:Time Factors; D014868:Water Deprivation; D014882:Water-Electrolyte Balance
chemical_list: D015415:Biomarkers; D006728:Hormones