Fujii Naoto, Aoki-Murakami Erii, Tsuji Bun, Kenny Glen P, Nagashima Kei, Kondo Narihiko, Nishiyasu Takeshi
Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba City, Japan.
Human and Environmental Physiology Research Unit University of Ottawa, Ottawa, Canada.
Physiol Rep. 2017 Nov;5(20). doi: 10.14814/phy2.13465.
We evaluated cold sensation at rest and in response to exercise-induced changes in core and skin temperatures in cold-sensitive exercise trained females. Fifty-eight trained young females were screened by a questionnaire, selecting cold-sensitive (Cold-sensitive, = 7) and non-cold-sensitive (Control, = 7) individuals. Participants rested in a room at 29.5°C for 100 min after which ambient temperature was reduced to 23.5°C where they remained resting for 60 min. Participants then performed 30-min of moderate intensity cycling (50% peak oxygen uptake) followed by a 60-min recovery. Core and mean skin temperatures and cold sensation over the whole-body and extremities (fingers and toes) were assessed throughout. Resting core temperature was lower in the Cold-sensitive relative to Control group (36.4 ± 0.3 vs. 36.7 ± 0.2°C). Core temperature increased to similar levels at end-exercise (37.2°C) and gradually returned to near preexercise rest levels at the end of recovery (>36.6°C). Whole-body cold sensation was greater in the Cold-sensitive relative to Control group during resting at a room temperature of 23.5°C only without a difference in mean skin temperature between groups. In contrast, cold sensation of the extremities was greater in the Cold-sensitive group prior to, during and following exercise albeit this was not paralleled by differences in mean extremity skin temperature. We show that young trained females who are sensitive to cold exhibit augmented whole-body cold sensation during rest under temperate ambient conditions. However, this response is diminished during and following exercise. In contrast, cold sensation of extremities is augmented during resting that persists during and following exercise.
我们评估了对寒冷敏感的、经过运动训练的女性在静息状态下以及运动引起的核心体温和皮肤温度变化时的冷觉感受。通过问卷调查对58名经过训练的年轻女性进行筛选，选出了对寒冷敏感的个体（冷敏组，n = 7）和对寒冷不敏感的个体（对照组，n = 7）。参与者在29.5°C的房间里休息约100分钟，之后环境温度降至23.5°C，他们在该温度下继续休息60分钟。然后参与者进行30分钟的中等强度骑行（摄氧量峰值的50%），随后进行60分钟的恢复。在整个过程中评估核心体温、平均皮肤温度以及全身和四肢（手指和脚趾）的冷觉感受。与对照组相比，冷敏组的静息核心体温较低（36.4±0.3 vs. 36.7±0.2°C）。运动结束时核心体温升高至相似水平（约37.2°C），并在恢复结束时逐渐回到接近运动前静息水平（>36.6°C）。仅在室温为23.5°C静息时，冷敏组的全身冷觉感受比对照组更强，而两组间平均皮肤温度无差异。相比之下，冷敏组在运动前、运动期间和运动后四肢的冷觉感受更强，尽管这与四肢平均皮肤温度的差异并不平行。我们发现，对寒冷敏感的年轻训练女性在温和的环境条件下休息时，全身冷觉感受增强。然而，这种反应在运动期间和运动后会减弱。相比之下，四肢的冷觉感受在休息时增强，并在运动期间和运动后持续存在。
