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 田下 智栄子 中村 浩二 高橋 哲平 三川 浩太郎 寺田 知新 渡邉 孝士郎 今井 一 惠良 聖一

出版者

日本教育医学会

雑誌

教育医学 (ISSN:02850990)

巻号頁・発行日

vol.65, no.3, pp.192-201, 2020 (Released:2020-03-01)

参考文献数

11

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In our previous study, we found that FetCO2 (PaCO2) increased during kendo with vocalization. Cerebral blood flow may increase during kendo exercises because PaCO2 has cerebral vasodilator effects. In this study, we measured the blood flow of the common carotid artery during intermittent bicycle ergometer exercise with vocalization as a basic study to elucidate the physiological characteristics of kendo. As a result, at the 80% V・O2peak with vocalization (same load as “kakari-keiko”), we observed a significant increase in FetCO2 (P = 0.022) and blood flow in the common carotid artery (P = 0.040). At the 60%V・O2peak with vocalization (same load as “kirikaeshi”), there was no significant increase in FetCO2; however, we observed a significant increase in blood flow in the common carotid artery (P = 0.035). In addition, in an ultrasonic image of the common jugular vein during exercise with vocalization, we observed the over-swelling of an internal jugular vein with partial blood regurgitation. This indicated that blood flow was temporarily stagnant. These results suggest that the increase in common carotid arteryblood flow was induced during exercise with vocalization. The increase in FetCO2 caused by vocalization, however, was not considered to be the main factor. One of the factors causing the increased common carotid artery blood flow was revealed to be related to an increasing-canceling of intrathoracic pressure due to vocalization-no-vocalization.

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.