- 著者一覧
- Saito Hiroyuki
Saito Hiroyuki
Affiliate Master
Yamaguchi University
None
The bulletin of the Yamaguchi Medical School Volume 68 Issue 3-4
pp. 31 - 39
published_at 2021
Creators :
Ishimaru Yasutaka
Mahbub MH
Yamaguchi Natsu
Hase Ryosuke
Nakagami Yuki
Takahashi Hidekazu
Watanabe Rie
Saito Hiroyuki
Shimokawa Junki
Yamamoto Hiroshi
Kikuchi Shinya
Tanabe Tsuyoshi
Publishers : Yamaguchi University School of Medicine
The bulletin of the Yamaguchi Medical School Volume 69 Issue 3-4
pp. 45 - 56
published_at 2022-12
Abstract Purpose: The purpose of this study was to investigate the effects of two different postures (sitting and standing) and three different ambient temperatures (10℃, 20℃, and 30℃) on heart rate variability (HRV) among healthy young adults. Methods: Twelve young adult volunteers (males 6, females 6) were recruited. Following acclimatization to any the room temperature (10℃, 20℃ or 30℃), 5-min measurements of HRV were conducted in sitting and standing postures of the subjects. Results: Compared to the sitting posture, measurements obtained in the standing posture revealed a significant decrease in high-frequency power/HF, root mean square of successive differences between RR intervals, standard deviation of Poincaré plot perpendicular to the line-of-identity or SD1 and SD1/standard deviation of Poincaré plot along the line-of-identity or SD2, and a significant increase in lowfrequency power/LF and LF/HF under all experimental conditions (p<0.05 to 0.005). Majority of HRV parameters showed significant differences while the values obtained under 10℃ were compared with 20℃ and 30℃ conditions, respectively (p<0.05 to 0.001). Conclusions: Our findings suggest the predominance of sympathetic tone in the standing compared with sitting posture. Furthermore, colder conditions caused a predominance of the parasympathetic activity in both sitting and standing postures, and such effects of ambient temperature on the sympathovagal balance were stronger in the latter posture.
Creators :
Wada Sunao
Mahbub MH
Nakagami Yuki
Hase Ryosuke
Yamaguchi Natsu
Takahashi Hidekazu
Saito Hiroyuki
Shimokawa Junki
Watanabe Rie
Harada Noriaki
Tanabe Tsuyoshi
Publishers : Yamaguchi University School of Medicine