著者

曽根 涼子 山崎 文夫 藤井 宣晴 鍋倉 賢治 池上 晴夫

出版者

The Japanese Society of Physical Fitness and Sports Medicine

雑誌

体力科学 (ISSN:0039906X)

巻号頁・発行日

vol.42, no.5, pp.465-474, 1993-10-01 (Released:2010-09-30)

参考文献数

29

被引用文献数

1

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激運動後における迷走神経活動の回復過程を呼吸性心周期変動の大きさの変化から検討することおよび呼吸性心周期変動の位相の変化を明らかにし1その変化の発生機構について検討することを目的として, 健康な男子大学生6名を被検者としてトレッドミルによるexhaustive走を行なわせ, 心周期および血圧の呼吸性変動の大きさおよび位相の変化を運動後5時間にわたって追跡調査した.呼吸周期および一回換気量は, それぞれ全測定を通して6秒および21に規制した.1) 呼吸性心周期変動の大きさはexhaustive走によって著しく減少するが, 運動後約2時間で前値に復した.呼吸運動を基準とした呼吸性心周期変動の位相は運動によって有意に遅れた.そして運動後2時間は急速に, それ以後は徐々に回復する傾向を示した.2) 呼吸性SBPの大きさおよび位相には運動後に顕著な変化は認められなかった.以上の結果から, 激運動によって抑制された迷走神経活動は運動終了から約2時間で回復すると考えられる.また, 運動後には呼吸性心周期変動の位相は明らかに遅れた.これは迷走神経の活動度の低下を反映している可能性がある.

著者

白井 祐介 品田 貴恵子 吉岡 利貢 鍋倉 賢治

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.59, no.1, pp.263-274, 2014 (Released:2014-06-13)

参考文献数

30

被引用文献数

2 1

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The aim of this study was to investigate the effect of differences in stroke rate (SR) on energy expenditure during rowing. Oxygen uptake (VO2) was measured under different SR conditions with the same power output. Eight male collegiate rowers (age: 21.6±1.4 yr, height: 171.1±1.8 cm, weight: 68.7±1.9 kg) participated in the study. First, they performed an incremental test on a rowing ergometer to determine power output at the blood lactate threshold (PLT). On other days, they performed 6 different SR trials maintaining their power output at 80% PLT (80% LT test) and 90% PLT (90% LT test), respectively. During the 80% and 90% LT tests, each subject used a triaxial accelerometer sensor placed on the back, and integrals of the absolute value of the accelerometer output from three directions (IAA) were calculated as an index of physical activity level. The most economical SR, at which VO2 was lowest, was found at 80% and 90% LT. In both tests, a higher IAA was observed with increasing SR. Under SR conditions higher than the economical point, there was a significant correlation between the increasing amount of IAA (ΔIAA) and VO2 (ΔVO2) from the economical SR during the 90% LT test (r=0.673, P<0.001). There were strong correlations (r>0.9) between IAA and VO2 in many subjects at a SR higher than the economical point. These results suggest that there is an economical SR point with the same power output during rowing. Additionally, an increasing amount of VO2 associated with IAA at a higher SR than the economical point. This suggests that IAA is useful for estimation of energy expended by the moving body during rowing.

著者

嶋津 航 髙山 史徳 丹治 史弥 鍋倉 賢治

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.18089, (Released:2019-05-15)

参考文献数

42

被引用文献数

2

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Heart rate (HR) monitoring, which reflects exercise intensity and environmental factors, is often used for pacing strategies in the marathon race. However, it is difficult to obtain appropriate feedback for only the HR value since cardiovascular drift (CV drift) occurs during prolonged exercise. Recently, cardiac cost (CC: HR divided by running velocity) has been shown to be a potential index for evaluation of CV drift during the marathon race. The aim of this study was to clarify the relationship between CV drift and performance in the marathon race. Fourteen male university student runners participated. They carried out incremental tests on a treadmill and took part in an actual marathon race. CV drift was evaluated from differences between CC in the 0-5-km section and over every 5-km section (ΔCC). The marathon performance was examined from two viewpoints: absolute performance (average running velocity during the race: Vmar), and relative performance (Vmar against velocity corresponding to ventilatory threshold: vVT achv.). Significant correlations were found between ΔCC and vVT achv. in the 25-30 km, 30-35 km and 35-40 km sections (r = −0.672, −0.671 and −0.661, respectively), suggesting that excessive CV drift had a negative impact on relative performance. We can therefore conclude that suppression of CV drift after 25 km is an important factor for improvement of relative performance.

著者

丹治 史弥 榎本 靖士 鍋倉 賢治

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.62, no.2, pp.523-534, 2017 (Released:2017-12-19)

参考文献数

33

被引用文献数

2

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This study investigated the relationships between running economy and various step parameters (ground contact time, step length and step frequency), as well as the effects of these relationships on differences in foot strike pattern at intensities ranging from below to above the lactate threshold in well-trained distance runners. Thirty-one male distance runners (20 middle-distance and 11 long-distance; age 19.5±1.2 years, height 171.7±4.5 cm, mass 57.6±3.5 kg, BMI 19.5±0.7) participated. Their seasonal best performance was 804.0±121.0 points, expressed as the IAAF score. Both running economy and step parameters were calculated for speeds of 15.0, 16.2 and 17.4 km·h−1, which corresponded to intensities below, equivalent to and above the lactate threshold, i.e. 93.2%±6.4%, 100.6%±6.9% and 108.1%±7.4%, respectively. As running speed increased, running economy, step length and step frequency increased, whereas the ground contact time decreased. A significant positive relationship was observed between ground contact time and running economy at an intensity above the lactate threshold (r=0.46, p<0.01). A significant positive relationship was observed between step length and running economy (r=0.54 and 0.52, p<0.01), and a negative relationship was observed between step frequency and running economy (r=−0.55 and −0.53, p<0.01) at intensities equivalent to and above the lactate threshold, respectively. Middle-foot strikers exhibited a shorter ground contact time than rear-foot strikers at intensities equivalent to and above the lactate threshold, whereas running economy exhibited no significant difference in terms of foot strike pattern. From the present results, it can be concluded that a shorter ground contact time enhances running economy; however, running economy is not related to the foot strike pattern at an intensity of 90%—110% of the lactate threshold.

著者

丹治 史弥 榎本 靖士 鍋倉 賢治

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.17013, (Released:2017-07-25)

参考文献数

33

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This study investigated the relationships between running economy and various step parameters (ground contact time, step length and step frequency), as well as the effects of these relationships on differences in foot strike pattern at intensities ranging from below to above the lactate threshold in well-trained distance runners. Thirty-one male distance runners (20 middle-distance and 11 long-distance; age 19.5±1.2 years, height 171.7±4.5 cm, mass 57.6±3.5 kg, BMI 19.5±0.7) participated. Their seasonal best performance was 804.0±121.0 points, expressed as the IAAF score. Both running economy and step parameters were calculated for speeds of 15.0, 16.2 and 17.4 km·h−1, which corresponded to intensities below, equivalent to and above the lactate threshold, i.e. 93.2%±6.4%, 100.6%±6.9% and 108.1%±7.4%, respectively. As running speed increased, running economy, step length and step frequency increased, whereas the ground contact time decreased. A significant positive relationship was observed between ground contact time and running economy at an intensity above the lactate threshold (r=0.46; p<0.01). A significant positive relationship was observed between step length and running economy (r=0.54 and 0.52; p<0.01), and a negative relationship was observed between step frequency and running economy (r=−0.55 and −0.53; p<0.01) at intensities equivalent to and above the lactate threshold, respectively. Rear-foot strikers exhibited a shorter ground contact time than middle-foot strikers at intensities equivalent to and above the lactate threshold, whereas running economy exhibited no significant difference in terms of foot strike pattern. From the present results, it can be concluded that a shorter ground contact time enhances running economy; however, running economy is not related to the foot strike pattern at an intensity of 90%—110% of the lactate threshold.

著者

白井 克佳 中里 信立 斉藤 実 鍋倉 賢治 松田 光生

出版者

人間環境大学

雑誌

人間と環境 (ISSN:13434780)

巻号頁・発行日

no.3, pp.69-77, 1999-06

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本研究は夏期合宿における競技選手のコンディションの変動を調査した。対象は男子陸上長距離選手8名とし、対象の起床時、朝練習時心拍数、主観的体調、尿(量、濃度)、及び走行距離と、練習を行った環境の計測を行った。その結果、起床時、朝練習時心拍数と主観的体調が、合宿が進行するに従い、低下することが観察された。起床時、朝練習時心拍数の低下は合宿によるトレーニング効果によるものか、合宿の環境に慣れたためか、今回の検討では明らかにすることができなかった。主観的体調の低下は先行研究では心拍数の増加とともに観察されたが、今回はそれと異なった結果となった。合宿中に脱水症状を起こし、練習を中止した選手がいたが、この選手の当日の尿量は前日までと比べ、著しく高値であった。このことは尿量の観察がコンディションを把握する上で有用であり、熱中症などの事故を未然に防ぐ手がかりとなる可能性があることを示している。

著者

鍋倉 賢治 榎本 靖士 門野 洋介 品田 貴恵子 白井 祐介 丹治 史弥 小林 優史

出版者

筑波大学

雑誌

基盤研究(C)

巻号頁・発行日

2011-04-28

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長距離走は、有酸素性能力(最大酸素摂取量、乳酸性代謝閾値、走の経済性の3要因)によってパフォーマンスの大部分を説明できると言われている。本研究では、レース中の生理応答、縦断的な体力測定などから中・長距離走のパフォーマンスと体力特性について検討した。中距離走の場合、有酸素性能力だけでなく無酸素性能力の貢献も大きく、また、体力特性に応じたレース戦略が重要であることが明らかとなった。一方、優れた長距離ランナーでは、3要因の中でも走の経済性の貢献が特に大きいこと、そして脂質をエネルギーに利用する能力が優れていることが明らかとなった。

著者

鍋倉 賢治

出版者

筑波大学

雑誌

筑波フォーラム (ISSN:03851850)

巻号頁・発行日

vol.57, pp.74-77, 2000-11

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昼休みや夕刻の学内ループに、ジョギングやウォーキングをする人を多く見かけます。健康・体力を維持するため?仕事の息抜き?気晴らし?ダイエット?それともマラソンで記録を更新するため? 学内関係者にとって、ループは手頃なジョギング(ジョグ)コースといえるでしょう。 ...