Relationship between ventilatory response and body temperature during prolonged submaximal exercise
Relationship between ventilatory response and body temperature during prolonged submaximal exercise
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DOI：
10.1152/japplphysiol.00541.2005
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发表时间：
2006-02-01
影响因子：
3.3
通讯作者：
Nishiyasu, T
中科院分区：
文献类型：
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作者：
Hayashi, K;Honda, Y;Nishiyasu, T
我们研究了在高温下长时间锻炼时，皮肤温度的升高或核心体温的上升速度是否会影响分钟通气量(V.E)和核心温度之间的关系。13名受试者穿着在10摄氏度(T10)、35摄氏度(T35)或45摄氏度(T45)下浸泡水的西装，在峰值摄氧量的50%的自行车功率计上锻炼60分钟。在运动中测量食道温度(TES)、皮温、心率(HR)、VE、潮气量、呼吸频率(F)、呼吸气体、血压(BP)和血乳酸。我们发现，氧摄取量、二氧化碳排出量、血压和血乳酸在不同的疗程中没有差异。TES、HR、VE和f在T10时段从第10分钟开始几乎保持不变，但所有这些参数在T35和T45时段逐渐增加，且T45时段的水平显著高于T35时段。在T35和T45组中，除两名受试者外，所有受试者绘制的VE与TES的函数关系图显示没有过度换气的阈值；相反，VE的增加与TES呈线性相关，T35和T45组之间的斜率或截距没有显著差异。因此，在高温下长时间的亚极量运动中，VE随核心温度的升高而增加，而皮肤温度和TES的增加速率对VE与TES的关系的影响明显较小。
We examined whether an increase in skin temperature or the rate of increase in core body temperature influences the relationship between minute ventilation (V.E) and core temperature during prolonged exercise in the heat. Thirteen subjects exercised for 60 min on a cycle ergometer at 50% of peak oxygen uptake while wearing a suit perfused with water at 10 degrees C (T10), 35 degrees C (T35), or 45 degrees C (T45). During the exercise, esophageal temperature (Tes), skin temperature, heart rate (HR), V. E, tidal volume, respiratory frequency (f), respiratory gases, blood pressure ( BP), and blood lactate were all measured. We found that oxygen uptake, carbon dioxide output, BP, and blood lactate did not differ among the sessions. Tes, HR, V. E, and f remained nearly constant from minute 10 onward in the T10 session, but all of these parameters progressively increased in the T35 and T45 sessions, and significantly higher levels were seen in the T45 than the T35 session. For all but two subjects in the T35 and T45 sessions, plotting V. E as a function of Tes revealed no threshold for hyperventilation; instead, increases in V. E were linearly related to Tes, and there were no significant differences in the slopes or intercepts between the T35 and T45 sessions. Thus, during prolonged submaximal exercise in the heat, V. E increases with core temperature, and the influences of skin temperature and the rate of increase in Tes on the relationship between V. E and Tes are apparently small.