Jung Dahee, Kim Dami, Park Joonhee, Lee Joo Young
College of Human Ecology, Seoul National University, Seoul, South Korea.
Research Institute of Human Ecology, Seoul National University, Seoul, South Korea.
J Physiol Anthropol. 2016 Aug 22;35(1):16. doi: 10.1186/s40101-016-0105-7.
Insensible body mass loss (IBL) from the human body continuously occurs, which is an important component in body heat exchange. The purpose of this study was to examine the relevance of IBL to anthropometric characteristics and self-identified thermal tolerance.
A total of 289 healthy young Korean males were chosen and sorted into the following three groups: heat tolerable only (HTO, N = 79), cold tolerable only (CTO, N = 104), neither heat nor cold tolerable (NHC, N = 106). They weighed before and after a 30-min rest under lightly clothed condition at an air temperature of 23 ± 1 °C with a relative humidity 55 ± 5 %RH.
(1) The IBL of 289 males had a mean of 90 ± 75 g h(-1) (48 ± 40 g h(-1) m(-2)); (2) No significant difference in IBL among the three groups were found; (3) Significant differences in body weight and body mass index (BMI) among three groups were found (P < 0.05), but insignificance was found for height (P = 0.726) or body surface area (P = 0.059); (4) CTO was approximately 4.1 kg heavier in body weight (P < 0.05) and higher in BMI (P < 0.01) than in HTO; (5) Only for the group CTO, IBL (g h(-1)) showed a positive relationship to BMI (P < 0.05, R (2) = 0.056), but there was no relationship between IBL and body surface area.
For healthy young males within normal anthropometric ranges in Korea, IBL was positively related to BMI, and individuals with greater BMI showed greater self-identified cold tolerance, but no direct relationship was found between IBL and self-identified cold tolerance. This suggests that body physique (e.g., BMI) could be an explanatory factor between insensible body heat loss and subjective cognition on cold tolerance.
人体的不显性体重丢失（IBL）持续发生，这是体热交换的一个重要组成部分。本研究的目的是探讨IBL与人体测量学特征及自我认定的热耐受性之间的相关性。
共选取289名健康的韩国年轻男性，并将其分为以下三组：仅耐热组（HTO，N = 79）、仅耐寒组（CTO，N = 104）、既不耐热也不耐寒组（NHC，N = 106）。他们在气温23±1°C、相对湿度55±5%RH的轻度着装条件下休息30分钟前后分别称重。
（1）289名男性的IBL平均值为90±75 g·h⁻¹（48±40 g·h⁻¹·m⁻²）；（2）三组之间的IBL未发现显著差异；（3）三组之间的体重和体重指数（BMI）存在显著差异（P < 0.05），但身高（P = 0.726）或体表面积（P = 0.059）无显著差异；（4）CTO组的体重比HTO组重约4.1 kg（P < 0.05），BMI也更高（P < 0.01）；（5）仅在CTO组中，IBL（g·h⁻¹）与BMI呈正相关（P < 0.05，R² = 0.056），但IBL与体表面积之间无相关性。
对于韩国正常人体测量范围内的健康年轻男性，IBL与BMI呈正相关，BMI较高的个体表现出更强的自我认定的耐寒性，但未发现IBL与自我认定的耐寒性之间存在直接关系。这表明身体体格（如BMI）可能是不显性体热丢失与耐寒性主观认知之间的一个解释因素。
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