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首页> 外文期刊>Medicine and science in sports and exercise >The impact of prolonged exercise in a cold environment upon cardiac function.
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The impact of prolonged exercise in a cold environment upon cardiac function.

机译：在寒冷环境中长时间运动对心脏功能的影响。

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PURPOSE: The purpose of the present study was to examine the impact of cold exposure coupled with prolonged exercise upon postexercise left ventricular (LV) function and markers of myocardial damage. METHODS: colon; Eight highly trained male athletes (mean +/- SD; age: 28.2 +/- 8.8 yr; height: 1.78 +/- 0.07 m; body mass: 74.9 +/- 7.6 kg; VO2max: 65.6 +/- 7.0 mL x kg(-1) x min(-1)) performed two 100-mile cycle trials, the first in an ambient temperature of 0 degrees C, the second in an ambient temperature of 19 degrees C. Echocardiographic assessment was completed and blood samples drawn before, immediately postexercise, and 24-h postexercise. Left ventricular systolic (stroke volume [SV], ejection fraction [EF], and systolic blood pressure/end systolic volume ratio [SBP/ESV]) and diastolic (early [E] to late [A] filling ratio [E:A]) parameters were calculated. Serum was analyzed for creatine kinase isoenzyme MB (CK-MBmass) and cardiac troponin T (cTnT). cTnT was analyzed descriptively whereas other variables were assessed using two-way repeated-measures ANOVA. RESULTS: No significant change was observed in systolic function across time or between trials. A significant difference between trials was observed in E:A immediately after exercise (1.4 +/- 0.4 [19 degrees C] vs 1.8 +/- 0.3 [0 degrees C]) (P < 0.05). CK-MBmass was significantly elevated immediately after exercise in both trials (P < 0.05). Positive cTnT concentrations were observed in two subjects immediately after the 19 degrees C trial (0.012 microg x L(-1) and 0.034 microg x L(-1)). CONCLUSIONS: Cycling 100 miles in an ambient temperature of 19 degrees C is associated with an acute change in diastolic filling that is not observed after prolonged exercise at 0 degrees C. Prolonged exercise is associated with minimal cardiac damage in some individuals; it appears that this is a separate phenomenon to the change in diastolic filling.
机译：目的：本研究的目的是检查冷暴露与长时间运动对运动后左心室（LV）功能和心肌损伤标志物的影响。方法：结肠八名训练有素的男运动员（平均+/- SD;年龄：28.2 +/- 8.8岁;身高：1.78 +/- 0.07 m;体重：74.9 +/- 7.6 kg;最大摄氧量：65.6 +/- 7.0 mL x kg （-1）x min（-1））进行了两个100英里的周期试验，第一个在环境温度为0摄氏度的环境中进行，第二个在环境温度为19摄氏度的环境中。 ，立即运动后和24小时运动后。左心室收缩期（中风量[SV]，射血分数[EF]和收缩压/收缩期末容积比[SBP / ESV]）和舒张期（早期[E]与晚期[A]充盈率[E：A] ）参数进行了计算。分析血清中的肌酸激酶同工酶MB（CK-MBmass）和心肌肌钙蛋白T（cTnT）。描述性地分析了cTnT，而其他变量则使用双向重复测量方差分析进行了评估。结果：在整个时间或试验之间，未观察到收缩功能的明显变化。运动后立即在E：A中观察到试验之间的显着差异（1.4 +/- 0.4 [19摄氏度]与1.8 +/- 0.3 [0摄氏度]）（P <0.05）。在两项试验中，运动后立即CK-MBmass显着升高（P <0.05）。在19摄氏度试验后立即在两名受试者中观察到cTnT阳性（0.012 microg x L（-1）和0.034 microg x L（-1））。结论：在19°C的环境温度下骑行100英里会导致舒张压充盈的急剧变化，而长时间在0°C下运动则未观察到。看来这是舒张期充盈改变的独立现象。

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