title: Effects of Exercise Induced Dehydration and Glycerol Rehydration on Anaerobic Power in Male Collegiate Wrestlers.
abstract: McKenna, ZJ and Gillum, TL. Effects of exercise induced dehydration and glycerol rehydration on anaerobic power in male collegiate wrestlers. J Strength Cond Res 31(11): 2965-2968, 2017-Wrestlers attempting to reach a specific weight class often use rapid weight loss (RWL). Rapid weight loss is associated with high levels of dehydration, which may hinder athletic performance. Thus, there is a need for wrestlers to optimize rehydration after achieving a specific weight. We sought to observe the effects of RWL on anaerobic power and the impact of glycerol on rehydration and power in male collegiate wrestlers (n = 7, 19.75 ± 1.67 years, 76.8 ± 4.32 kg, 11.6 ± 4.32% body fat, 59.9 ± 6.42 ml·kg·min). Subjects were assessed for body mass (BM), hydration, and mean power output (Wmean) before exercise (pre), immediately after exercise (3% dehydrated), and 60 minutes after exercise (rehydrated). Participants ran at 70% of V[Combining Dot Above]O2max in a heated room (30° C) until 3% BM loss (BML). Subjects rehydrated drinking either 26 ml·kg of water (control) or a 3% glycerol (treatment) solution containing 26 ml·kg of water and 1 g·kg of glycerol. Participants lost 3.00 ± 0.31% (control) and 2.89 ± 0.26% (treatment) of their BM from the pre- to dehydrated conditions. Wmean (control: 659.29 ± 79.12, 651.43 ± 70.71, 659.71 ± 82.78; treatment: 647.71 ± 110.64, 644.57 ± 118.15, 638.14 ± 100.71) did not differ across time (p = 0.87) nor condition (p = 0.80). In addition, glycerol had no significant impact on acute hydration (control: urine-specific gravity [SG] = 1.019 ± 0.010; treatment: SG = 1.017 ± 0.017). These data show that 3% BML did not impair anaerobic performance, and furthermore that glycerol proved ineffective for rehydration in a match like scenario for the competing wrestler.
authors.affiliation: Department of Kinesiology, California Baptist University, Riverside, California.
authors.forename: Zachary J
authors.initials: ZJ
authors.lastname: McKenna
authors.forename: Trevor L
authors.initials: TL
authors.lastname: Gillum
mesh_terms: D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D015992:Body Mass Index; D001834:Body Water; D003681:Dehydration / Q000503:physiopathology*; D060766:Drinking Water; D005440:Fluid Therapy / Q000379:methods*; D005990:Glycerol / Q000494:pharmacology*; D006801:Humans; D008297:Male; D013178:Sports Medicine; D014495:Universities; D014882:Water-Electrolyte Balance; D014952:Wrestling / Q000502:physiology*; D055815:Young Adult
chemical_list: D060766:Drinking Water; D005990:Glycerol