Effect of stride frequency on thermoregulatory responses during endurance running in distance runners.
Effect of stride frequency on thermoregulatory responses during endurance running in distance runners.
复制标题
步频对长跑运动员耐力跑期间体温调节反应的影响。
DOI：
10.1016/j.jtherbio.2016.08.005
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发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
Kondo N
中科院分区：
文献类型：
--
作者：
Amano T;Ishitobi M;Ogura Y;Inoue Y;Koga S;Nishiyasu T;Kondo N
改变步频可能会影响在跑步过程中的氧摄取和心率，作为跑步经济性和中央命令的函数。本研究探讨步频调控对耐力跑时体温调节反应的影响。七名健康的耐力跑步者在受控环境室（环境温度27 °C和相对湿度50%）中以15 km/h的速度在跑步机上跑步60分钟，并且控制步频。通过将频率从预定的首选频率增加和降低10%来间歇性地操纵步频。这些增加或减少的时间段通过自由频率跑步分开，自由步频，步频操纵（增加或减少），自由步频，步频操纵（增加或减少）的顺序，各15分钟。增加和减少的步频分别为自由跑频率的110%和91%（分别为196±6、162±5和178±5步/分钟，P<0.01）。与对照组相比，步频操作并没有影响直肠温度，心率，或在运行过程中感知疲惫的速度。当控制步频时，全身出汗量显著增加（控制和控制步频分别为1.48±0.11和1.57±0.11 kg，P<0.05），但步频对整体出汗量的影响很小（Cohen's d=0.31）。混合频率条件下的平均皮肤温度也高于对照组（P<0.05）。虽然这些变化背后的确切机制仍然未知（例如，跑步经济或中央命令），但我们的研究结果表明，步频的操纵对出汗或其他生理变量没有很大的影响，但在耐力跑步期间确实会增加平均皮肤温度。
Changing stride frequency may influence oxygen uptake and heart rate during running as a function of running economy and central command. This study investigated the influence of stride frequency manipulation on thermoregulatory responses during endurance running. Seven healthy endurance runners ran on a treadmill at a velocity of 15 km/h for 60 min in a controlled environmental chamber (ambient temperature 27 °C and relative humidity 50%), and stride frequency was manipulated. Stride frequency was intermittently manipulated by increasing and decreasing frequency by 10% from the pre-determined preferred frequency. These periods of increase or decrease were separated by free frequency running in the order of free stride frequency, stride frequency manipulation (increase or decrease), free stride frequency, and stride frequency manipulation (increase or decrease) for 15 min each. The increased and decreased stride frequencies were 110% and 91% of the free running frequency, respectively (196±6, 162±5, and 178±5 steps/min, respectively,P<0.01). Compared to the control, stride frequency manipulation did not affect rectal temperature, heart rate, or the rate of perceived exhaustion during running. Whole-body sweat loss increased significantly when stride frequency was manipulated (1.48±0.11 and 1.57±0.11 kg for control and manipulated stride frequencies, respectively,P<0.05), but stride frequency had a small effect on sweat loss overall (Cohen's d=0.31). A higher mean skin temperature was also observed under mixed frequency conditions compared to that in the control (P<0.05). While the precise mechanisms underlying these changes remain unknown (e.g. running economy or central command), our results suggest that manipulation of stride frequency does not have a large effect on sweat loss or other physiological variables, but does increase mean skin temperature during endurance running.