Szymanski Michael, Miller Kevin C, O'Connor Paul, Hildebrandt Leslie, Umberger Leah
Central Michigan University, School of Rehabilitation and Medical Sciences, Mount Pleasant, Michigan.
Central Michigan University, School of Health Sciences, Mount Pleasant, Michigan; and.
J Strength Cond Res. 2022 May 1;36(5):1171-1176. doi: 10.1519/JSC.0000000000003605. Epub 2020 Jun 19.
Szymanski, M, Miller, KC, O'Connor, P, Hildebrandt, L, and Umberger, L. Sweat characteristics in individuals with varying susceptibilities of exercise-associated muscle cramps. J Strength Cond Res 36(5): 1171-1176, 2022-Many medical professionals believe dehydration and electrolyte losses cause exercise-associated muscle cramping (EAMC). Unlike prior field studies, we compared sweat characteristics in crampers and noncrampers but accounted for numerous factors that affect sweat characteristics including initial hydration status, diet and fluid intake, exercise conditions, and environmental conditions. Sixteen women and 14 men (mean ± SD; age = 21 ± 2 year, body mass = 69.1 ± 11.6 kg, height = 171.4 ± 9.9 cm) self-reported either no EAMC history (n = 8), low EAMC history (n = 10), or high EAMC history (n = 12). We measured V̇o2max, and subjects recorded their diet. At least 3 days later, subjects ran at 70% of their V̇o2max for 30 minutes in the heat (39.9 ± 0.6° C, 36 ± 2% relative humidity). Dorsal forearm sweat was collected and analyzed for sweat sodium concentration ([Na+]sw), sweat potassium concentration ([K+]sw), and sweat chloride concentration ([Cl-]sw). Sweat rate (SWR) was estimated from body mass and normalized using body surface area (BSA). Dietary fluid, Na+, and K+ ingestion was estimated from a 3-day diet log. We observed no differences for any variable among the original 3 groups (p = 0.05-p = 0.73). Thus, we combined the high and low cramp groups and reanalyzed the data against the noncramping group. Again, there were no differences for [Na+]sw (p = 0.68), [K+]sw (p = 0.86), [Cl-]sw, (p = 0.69), SWR/BSA (p = 0.11), dietary Na+ (p = 0.14), dietary K+ (p = 0.66), and fluid intake (p = 0.28). Fluid and electrolyte losses may play a more minor role in EAMC genesis than previously thought.
希曼斯基、M、米勒、KC、奥康纳、P、希尔德布兰特、L和昂贝格尔、L。不同运动相关性肌肉痉挛易感性个体的汗液特征。《力量与体能研究杂志》36(5): 1171 - 1176，2022年 - 许多医学专业人员认为脱水和电解质流失会导致运动相关性肌肉痉挛（EAMC）。与之前的现场研究不同，我们比较了痉挛者和非痉挛者的汗液特征，但考虑了许多影响汗液特征的因素，包括初始水合状态、饮食和液体摄入量、运动条件以及环境条件。16名女性和14名男性（平均值±标准差；年龄 = 21±2岁，体重 = 69.1±11.6千克，身高 = 171.4±9.9厘米）自我报告无EAMC病史（n = 8）、低EAMC病史（n = 10）或高EAMC病史（n = 12）。我们测量了最大摄氧量（V̇o2max），受试者记录了他们的饮食。至少3天后，受试者在高温环境（39.9±0.6°C，相对湿度36±2%）下以其V̇o2max的70%跑步30分钟。收集前臂背部汗液并分析汗液钠浓度（[Na⁺]sw）、汗液钾浓度（[K⁺]sw）和汗液氯浓度（[Cl⁻]sw）。汗液率（SWR）通过体重估算并使用体表面积（BSA）进行标准化。饮食中的液体、钠和钾摄入量通过3天饮食记录估算。我们观察到最初的3组之间任何变量均无差异（p = 0.05 - p = 0.73）。因此，我们将高痉挛组和低痉挛组合并，并与非痉挛组重新分析数据。同样，[Na⁺]sw（p = 0.68）、[K⁺]sw（p = 0.86）、[Cl⁻]sw（p = 0.69）、SWR/BSA（p = 0.11）、饮食中的钠（p = 0.14）、饮食中的钾（p = 0.66）和液体摄入量（p = 0.28）均无差异。与之前的想法相比，液体和电解质流失在EAMC发生过程中可能起的作用更小。
