Graduate Program in Human Movement Science, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
J Pediatr. 2013 May;162(5):1054-60. doi: 10.1016/j.jpeds.2012.10.047. Epub 2012 Dec 7.
To compare thermoregulatory and perceptual responses between lean and obese girls during and after exercise under heat (HC) and thermoneutral (TC) conditions.
In a randomized order, 27 girls (14 lean [16.6 ± 6.7% fat and 9.1 ± 1.3 years] and 13 obese [41.3 ± 6.7% fat and 9.4 ± 1.1 years]) cycled 30 minutes at ~55% peak oxygen uptake in 2 sessions, which only differed in the thermal conditions (35 °C and 40% relative humidity vs 24 °C and 50% relative humidity).
Initial rectal temperature (T(re)) was higher in obese versus lean during HC (37.5 ± 0.3 °C vs 37.3 ± 0.3 °C, P = .03) and TC (37.6 ± 0.3 °C vs 37.3 ± 0.2 °C; P = .03) sessions. During cycling, Tre remained higher in the obese, but the rate of increase was greater in the lean. This change occurred mainly in the HC, when final Tre of the lean surpassed that of the obese (37.8 ± 0.2 vs 38.0 ± 0.2 °C, P = .04). Sweat volume (in mL · m(-2)) was similar between lean and obese in the HC (167 ± 119 and 120 ± 145) and TC (200 ± 196 vs 72 ± 20). Heart rate, rate of perceived exertion, and thermal sensation were similar between groups, independent of the thermal condition. Cycling in HC produced decreased thermal comfort (P = .009) and increased irritation (P = .02) within the lean girls.
Thermoregulatory and perceptual responses of prepubescent obese girls during 30 minutes of cycling at a similar relative intensity do not seem to be impaired when comparing with a lean group either in TC or HC.
比较肥胖女孩和瘦女孩在热环境（HC）和热中性（TC）条件下运动中和运动后的体温调节和感觉反应。
按照随机顺序，27 名女孩（14 名瘦女孩[16.6 ± 6.7%脂肪和 9.1 ± 1.3 岁]和 13 名肥胖女孩[41.3 ± 6.7%脂肪和 9.4 ± 1.1 岁]）在 2 个会话中以约 55%的峰值摄氧量进行 30 分钟的自行车运动，这两个会话仅在热条件（35°C 和 40%相对湿度与 24°C 和 50%相对湿度）上有所不同。
在 HC（37.5 ± 0.3°C 与 37.3 ± 0.3°C，P =.03）和 TC（37.6 ± 0.3°C 与 37.3 ± 0.2°C，P =.03）期间，肥胖女孩的初始直肠温度（Tre）高于瘦女孩。在骑自行车期间，Tre 仍然在肥胖女孩中较高，但在瘦女孩中增加的速度更快。这种变化主要发生在 HC 中，当时瘦女孩的最终 Tre 超过了肥胖女孩（37.8 ± 0.2 与 38.0 ± 0.2°C，P =.04）。在 HC（167 ± 119 和 120 ± 145）和 TC（200 ± 196 与 72 ± 20）中，瘦女孩和肥胖女孩的汗量（以 mL·m(-2)表示）相似。在 TC 或 HC 中，无论热条件如何，心率、感觉用力程度和热感觉在组间相似。在 HC 中进行自行车运动导致瘦女孩的热舒适度降低（P =.009）和刺激感增加（P =.02）。
在相对强度相似的情况下，肥胖女孩在进行 30 分钟的自行车运动期间，其体温调节和感觉反应在 TC 或 HC 中似乎并不比瘦女孩受损。
