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目的 :观察早晨和下午运动对体液变化的影响。方法 :16名身体健康的男性大学生 (2 2± 2岁 )参加两次相同的运动强度为心率 14 0次 /分的实验 ,受试者在功率自行车上运动 1小时 ,之后休息 1小时。第 1次在早晨 5时 ,第 2次在 1周后的下午 5时。分别在运动前、中 (第 30分钟 )、后即刻 (第 6 0分钟 )及休息期间的第 30分钟、第 6 0分钟采集血液 ;运动前、运动后即刻、休息结束(第 6 0分钟 )采集尿液标本。测定血浆容量的变化 (△PV)、体重的变化 (△W ) ,同时测定血红蛋白(Hb)、红细胞压积 (Hct)和血、尿离子及渗透压变化 (OSM) ,以体重减少来估算体液的丢失程度。结果 :运动导致的血浆容量减少早晨比下午明显 (早晨减少 :6 1± 0 9% ;下午减少 4 1± 0 6 % ,P <0 0 5 ) ;运动导致的体重减轻早晨比下午严重 (早晨 :1 0 3± 0 0 4kg ;下午 :0 87± 0 0 2kg ,P <0 0 5 ) ;运动后的尿量排出下午比早晨多 (早晨 :75± 10ml ;下午 :14 9± 14ml ,P <0 0 5 )。这些都反映了进行相同强度的运动机体早晨脱水比下午严重。结论 :(1)在早晨和下午进行相同运动负荷对体液产生的影响 ,主要表现为 :早晨运动导致的体液丢失比下午严重。 (2 )从体液和电解质变化的角度来分析 ,由于早晨运动导致脱水较严重 ,建?
Objective: To observe the effects of morning and afternoon exercise on body fluid changes. METHODS: Six healthy male college students (22 ± 2 years) participated in two identical exercises with a heart rate of 140 beats per minute. Subjects exercised on power bicycles for 1 hour and then for 1 hour. The first time was at 5:00 in the morning and the second time was at 5:00 PM in the next week. The blood was collected before the exercise, in the middle (30th minute), immediately after the 60th minute (60th minute), and at the 30th minute and the 60th minute during the rest, before exercise, immediately after exercise and at rest (60th minute) Collect urine samples. The changes of plasma volume (△ PV) and body weight (△ W) were measured and the hemoglobin (Hb), hematocrit (Hct) and blood, urine and osmotic pressure were measured simultaneously The degree of loss. RESULTS: Exercise-induced reduction of plasma volume was more pronounced in the morning than in the afternoon (morning reduction: 6 1 ± 0 9%; afternoon reduction 4 1 ± 0 6%, P 0 05); exercise-induced weight loss was more severe in the morning than in the afternoon : 0 103 ± 0 0 4 kg; Afternoon 0 87 ± 0 0 2 kg, P 0 05). Excretion of urine after exercise was more in the afternoon than in the morning (morning: 75 ± 10 ml; afternoon: 14 9 ± 14 ml, P <0 0 5). These are all reflected in the exercise of the same intensity of exercise in the morning dehydration more severe than the afternoon. CONCLUSIONS: (1) The effects of the same exercise load on body fluids during the morning and afternoon are mainly as follows: The fluid loss caused by morning exercise is more serious than the afternoon. (2) from the perspective of changes in body fluids and electrolytes, as a result of morning exercise more serious dehydration, built?