The effect of menstrual cycle phase on foot skin temperature during mild local cooling in young women
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Japanese women can experience a sensation of cold feet in daily life. It is possible that this sensation of coldness in feet may be associated with female hormones, but to date the effect of menstrual cycle phase on the skin temperature (Tsk) of the foot during local cooling is unknown. We therefore examined Tsk and partial cutaneous blood flow in the foot during the follicular (F) and luteal (L) phases of the menstrual cycle in women experiencing local cooling. Tsk was measured in the toes and the dorsum of the left foot using infrared thermography, while cutaneous blood flow was evaluated in the big toe of the left foot using laser Doppler flowmetry (LDF), both at 28 °C. Mild local cooling (24.7 °C) was then applied for 30 min to the right foot. During cooling of the right foot, no significant differences in Tsk were observed between the F and L phases in either the toes of the left foot or the dorsum of the left foot of all subjects. However, cutaneous blood flow determined by LDF in the big toe of the left foot was greater in the F phase than in the L phase. These results suggest that the menstrual cycle phase did not affect Tsk in the foot, but it did affect cutaneous blood flow in the big toe during mild local cooling.
KeywordsMenstrual cycle Skin temperature Skin blood flow Toes Dorsum of foot
We are grateful to Yuri Mizukami, Koko Kano (Nara Women’s University), Dr. Ken Tokizawa (National Institute of Occupational Safety and Health), and to Dr. Mayumi Matsuda-Nakamura (International University of Health and Welfare) for support of this research. The present research was partially supported by the Ministry of Education, Science, Sports, and Culture; Grant-in-Aids for Scientific Research (B), No. 17K17882; Nara Women’s University; Intramural and Mental and Physical Health Project Research Grants.
This study was funded by the Ministry of Education, Science, Sports, and Culture; Grant-in-Aids for Scientific Research (B), No. 17K17882; Nara Women’s University; Intramural and Mental and Physical Health Project Research Grants.
Compliance with Ethical Standards:
Conflict of Interest
All authors declare that they have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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