Rossi L, Schaefer Cardoso M, Torres H, Ragasso Casalenovo V
Centro Universitário São Camilo, São Paulo, Brazil.
J Sports Med Phys Fitness. 2011 Dec;51(4):603-8.
This study aimed to analyze sweat rate, water percentage alteration, and temperature variation during kendo practice in order to relate the thermal stress induced by such sports and draw recommendations for its secure practice.
Participants were 12 male individuals. The studied variables were: age, weight, stature, body mass index, fat percentage, water loss percentage, tympanic temperature, and sweat rate. Measures were obtained in one day of 120 min practice (T: 24.1 ± 2.5 °C; RH: 73 ± 8.5%) using obligatory training equipment.
The age of participants was on average 26 ± 6.2 years, stature 1.8 ± 0.03 m, weight 78 ± 13.7 kg, BMI 24.12 ± 4.03 kg/m² and fat percentage 15.7 ± 5.1%. Weight and temperature final values were significantly different from the initial ones (P<0.01). Estimated sweat rate was 0.35 L.h-1 (95% CI = [0.299; 0.400]) and estimated percentage of water loss was 0.946% (95% CI = [0.694; 1.174]).
Kendo practice using obligatory equipment significantly increases temperature, even when sweat rate and water loss percentage are low. The almost complete obstruction of the evaporative surface leads to heat accumulation, which may result in risks comparable to those of American football players. Thus, preventive measures must be established to minimize the risks of the combination among environment (tropical climate), equipment (bogu) and the high physiological demand of this sport in order to prevent greater damages to the health of practitioners.
本研究旨在分析剑道练习过程中的出汗率、水分百分比变化和温度变化，以便关联此类运动引起的热应激，并为安全练习提出建议。
参与者为12名男性个体。研究变量包括：年龄、体重、身高、体重指数、脂肪百分比、水分流失百分比、鼓膜温度和出汗率。在一天120分钟的练习中（温度：24.1±2.5°C；相对湿度：73±8.5%）使用必备训练装备获取测量数据。
参与者的平均年龄为26±6.2岁，身高1.8±0.03米，体重78±13.7千克，体重指数24.12±4.03千克/平方米，脂肪百分比15.7±5.1%。体重和温度的最终值与初始值有显著差异（P<0.01）。估计出汗率为0.35升/小时（95%置信区间=[0.299；0.400]），估计水分流失百分比为0.946%（95%置信区间=[0.694；1.174]）。
即使出汗率和水分流失百分比很低，使用必备装备进行剑道练习也会显著提高体温。蒸发表面几乎完全受阻导致热量积聚，这可能导致与美式橄榄球运动员类似的风险。因此，必须制定预防措施，以尽量减少环境（热带气候）、装备（护具）和这项运动的高生理需求相结合带来的风险，从而防止对练习者健康造成更大损害。
