著者

有川 一 坂本 太一

出版者

日本武道学会

雑誌

武道学研究 (ISSN:02879700)

巻号頁・発行日

vol.56, no.1, pp.13-18, 2023 (Released:2023-11-14)

参考文献数

14

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Nitric oxide (NO), an endogenous vasodilator that relaxes vascular endothelial cells and which is synthesized in the body, is primarily released from the sinuses into the nasal cavity during the continuous vocalization of “humming” nasal sounds. One of the vocalizations performed during kendo is “men”, which produces nasal sounds. We hypothesized that during these vocalizations, the fractional exhaled NO (FeNO) via the nasal cavity may increase. In this study, we measured FeNO through the nasal cavity of nine experienced kendo players when they vocalized “men” with a nasal sound in kendo. As a result, compared with humming (151.4±30.1 ppb), which involves continuous nasal sounds, the single vowel vocalization of “meeen” showed a significantly lower FeNO value (41.6±11.0 ppb, P=0.005). However, the repeated vocalization of “men”, which consists of two repeated nasal sounds, showed a similar value to that during humming (141.9±25.2 ppb, P=0.977). Our results illustrated that FeNO release via the nasal cavity increased during repeated vocalizations of “men” in one breath, such as during “kirikaeshi”. Therefore, we were able to further the current understanding of the physiological characteristics of the manner of kendo exercise.

著者

有川 一 吉田 貫司 久保 あゆみ 坂本 太一 渡邉 孝士郎 今井 一

出版者

日本武道学会

雑誌

武道学研究 (ISSN:02879700)

巻号頁・発行日

vol.53, no.1, pp.1-9, 2020 (Released:2020-09-19)

参考文献数

24

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Research suggests that psychological stress due to competing against opponents of different skill levels affects exercise intensity during kendo gokaku-geiko. However, few studies have clarified the relationship between psychological stress measured using objective indices and exercise intensity. In this study, we measured psychological stress, exercise intensity, and physical activity in players during kendo gokaku-geiko with opponents of different skill levels using objective, non-invasive, simple measures.Six male members of the university kendo team participated in this study. They performed kendo gokaku-geiko for 3 minutes with highly skilled, equivalently skilled, and non-highly skilled opponents. We measured psychological stress indices (salivary amylase activity and autonomic balance [LF/HF]), exercise intensity indices (heart rate [HR], peripheral oxygen saturation [SpO2], rate of perceived exertion [RPE]), and physical activity indices (number of steps and strikes) during keiko.We observed an increasing tendency of salivary amylase activity, HR, RPE, and physical activity indices during keiko with highly, but not with non-highly, skilled opponents. On the other hand, we detected an increasing tendency of LF/HF with both types of opponents.These results suggest that in keiko with highly skilled opponents, the participants experienced tension (i.e. a “fight-or-flight response”) caused by strong pressure and attacks from their opponents; thus, they increased their physical activity and exercise intensity and were likely to experience high stress. On the other hand, in keiko with non-highly skilled opponents, the participants experienced low stress due to a lack of exercise intensity and low physical activity.