Tohoku J. Exp. Med., 2014 October, 234(2)

Higher Sweating Rate and Skin Blood Flow during the Luteal Phase of the Menstrual Cycle

HANEUL LEE,¹ JERROLD PETROFSKY,¹ NIRALI SHAH,¹ ABDULAZIZ AWALI,¹ KARAN SHAH,¹ MOHAMMED ALOTAIBI¹ and JONGEUN YIM²

¹Department of Physical Therapy, Loma Linda University, Loma Linda, CA, USA
²Department of Physical Therapy, Sahmyook University, Seoul, Korea

Evaporation by sweating is the most effective way to remove heat from the body. Sweat rates increase under both local and whole-body heat stress. Men and women differ in how they respond to heat, because sexual steroids alter resting body core temperature and the threshold for sweating and skin blood flow (SBF) during heating. The purpose of the present study was to compare local sweat rates and cutaneous vasodilatation during heat exposure in women with a regular menstrual cycle. The cutaneous vasodilatation was judged by measuring the SBF. Eight female and nine male subjects participated in this study, and their age range was 24-29 years. Female subjects were tested twice throughout one full menstrual cycle: once during the middle follicular phases and once during the luteal phase. Subjects remained in a temperature-regulated room at 41°C and 21% of relative humidity for 40 minutes. Sweat rate was recorded from the forehead, forearm, and thigh, and skin temperature and SBF were measured on the thigh and forehead. We found that the sweating rate and SBF were greater in the luteal phase compared to follicular phase (p < 0.05). Since both SBF and sweating were controlled by the sympathetic nerve system, the sympathetic outflow was greater during whole body heat exposure in the luteal phase. In contrast, for men, there was no significant difference in sweating and SBF over the same calendar period (p > 0.05). We propose the enhanced sympathetic activity in the luteal phase with a regular menstrual cycle.

keywords —— cutaneous vasodilatation; estrogen; menstrual cycle; progesterone; sweat rate

© 2014 Tohoku University Medical Press

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Tohoku J. Exp. Med., 2014, 234, 117-122

Correspondence: JongEun Yim, Department of Physical Therapy, Sahmyook University, Hwarangro 815, Nowon-gu, Seoul 139-742, Republic of Korea.

e-mail: jeyim@syu.ac.kr