Center for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia.
Australian Institute of Sport, Bruce, Australian Capital Territory, Australia.
J Strength Cond Res. 2018 Sep;32(9):2555-2561. doi: 10.1519/JSC.0000000000002249.
Barley, OR, Iredale, F, Chapman, DW, Hopper, A, and Abbiss, C. Repeat effort performance is reduced 24 hours after acute dehydration in mixed martial arts athletes. J Strength Cond Res 32(9): 2555-2561, 2018-This study sought to determine the influence of acute dehydration on physical performance and physiology in mixed martial arts (MMA). Mixed martial arts athletes (n = 14; age: 23 ± 4 years) completed in a randomized counterbalanced order a dehydration protocol, (DHY: 3-hour cycling at 60 W in 40° C to induce 5% dehydration) or thermoneutral control (25° C: CONT) exercise, followed by ad libitum fluid/food intake. Performance testing (a repeat sled push test, medicine ball chest throw, and vertical jump) was completed 3 hours and 24 hours after the intervention, whereas urine and blood samples were collected before, 20 minutes, 3 hours, and 24 hours after the intervention. Body mass was reduced (4.8 ± 0.8%) after DHY (p < 0.001) and remained lower than CONT at 3 hours and 24 hours after DHY (p = 0.003 and p = 0.024, respectively). Compared with CONT, average sled push times were slower 3 hours and 24 hours after DHY (19 ± 15%; p = 0.001; g = 1.229 and 14 ± 15%; p = 0.012; g = 0.671, respectively). When compared with the CONT, handgrip was weaker 3 hours after DHY (53 ± 8 and 51 ± 8 kg; p = 0.044, g = 0.243, respectively) and medicine ball chest throw distances were shorter 24 hours after DHY (474 ± 52 and 449 ± 44 cm; p = 0.016, g = 0.253, respectively). No significant differences were observed in vertical jump (p = 0.467). Urine specific gravity was higher than CONT 20 minutes (p = 0.035) and 24 hours (p = 0.035) after DHY. Acute dehydration of 4.8% body mass results in reduced physical performance 3 and 24 hours after DHY. There is need for caution when athletes use dehydration for weight loss 24 hours before competition.
奥勒冈州的巴利、伊雷代尔、查普曼、霍珀和阿比思。急性脱水会降低综合格斗运动员 24 小时后的重复努力表现。《力量与调节研究杂志》32（9）：2555-2561，2018-本研究旨在确定急性脱水对综合格斗（MMA）运动员生理和体能的影响。14 名综合格斗运动员（年龄：23±4 岁）以随机交叉平衡的方式完成脱水方案（DHY：在 40°C 下以 60 W 进行 3 小时的骑行以造成 5%的脱水）或热中性对照（25°C：CONT）运动，随后进行随意的液体/食物摄入。干预后 3 小时和 24 小时进行了性能测试（重复雪橇推测试、药球胸部投掷和垂直跳跃），而在干预前、20 分钟、3 小时和 24 小时后采集了尿液和血液样本。DHY 后体重减轻（4.8±0.8%）（p<0.001），DHY 后 3 小时和 24 小时体重仍低于 CONT（p=0.003 和 p=0.024）。与 CONT 相比，DHY 后 3 小时和 24 小时的平均雪橇推时间较慢（19±15%；p=0.001；g=1.229 和 14±15%；p=0.012；g=0.671，分别）。与 CONT 相比，DHY 后 3 小时握力较弱（53±8 和 51±8 千克；p=0.044，g=0.243，分别），DHY 后 24 小时药球胸部投掷距离较短（474±52 和 449±44 厘米；p=0.016，g=0.253，分别）。垂直跳跃无显著差异（p=0.467）。DHY 后 20 分钟（p=0.035）和 24 小时（p=0.035）尿液比重高于 CONT。体重减轻 4.8%的急性脱水会导致 DHY 后 3 小时和 24 小时的身体表现下降。运动员在比赛前 24 小时使用脱水法减重时需要谨慎。
