- 著者
- 谷中 拓哉 中里 浩介 藤田 善也 石毛 勇介
- 出版者
- 一般社団法人 日本体育・スポーツ・健康学会
- 雑誌
- 体育学研究 (ISSN:04846710)
- 巻号頁・発行日
- pp.18050, (Released:2019-03-18)
- 参考文献数
- 23
Cross-country skiers perform over a long distance using poles and skis. Physical fitness, in terms of factors such as VO2max and muscle strength, skiing technique and race strategy are important for winning competitions. To plan the race strategy, investigations of the course profile and race analysis are needed. The purposes of this study were to investigate cross-country skiing course profiles which were planned for the Winter Olympic Games at Peyongchang, and to analyze the men’s 15km+15km World Cup skiathlon race (SA) as a pre-competition event. A cross-country skier followed the classical and skating courses using a GNSS (Global Navigation Satellite System) antenna. The antenna instantly measured the latitude, longitude and height of the skier on the courses. The coordinate values on a plane were calculated from latitude and longitude, after the inclination was then calculated from the coordinate values and height every 10 m. The overall finish time and transit time at 24 points for 12 skiers in SA were retrieved from the Official Home Page of the International Ski Federation (FIS), and the segment times among the various points were calculated. Three segment times formed a lap, and each segment speed was calculated by dividing the segment distance by the segment time. For the classical course profile, the distance was 3819 m and the maximum inclination was 18.6%. In contrast, for the skating course, the distance was 3777 m and the maximum inclination was 20.6%. No correlation was found between the overall finish time and the segment times for the classical course. This result was attributable to small variations in the lap times for the classical course because of the skiers’ use strategy, checking among competitors, and the mass-start. On the other hand, positive correlations were found between the overall finish time and the segment times on skating. In skating, the segment speeds from the final phase of the 2nd lap to the middle phase of the 3rd lap indicated deceleration relative to the 1st lap. These results suggest that gliding on a skating course in a short time is important for shortening the overall finish-time. Especially, it is important to minimize the deceleration of the 2nd and 3rd lap segment speed. The race pattern for the Olympic Games was similar to that of pre-competition, except for the time taken. These results indicate that pre-competition race analysis is useful for devising a strategy for target competition.
5 0 0 0 OA 第30 回公開研究フォーラム報告 : 女性とオリンピック
- 著者
- 星川 佳広 來田 享子 宮嶋 泰子 溝口 紀子 石毛 勇介 湯田 淳
- 雑誌
- 日本女子体育大学附属基礎体力研究所紀要 = Journal of exercise science (ISSN:09183825)
- 巻号頁・発行日
- vol.30, pp.30-55, 2021-03
- 著者
- 藤田 善也 石毛 勇介 吉岡 伸輔 竹田 正樹
- 出版者
- 一般社団法人 日本体育・スポーツ・健康学会
- 雑誌
- 体育学研究 (ISSN:04846710)
- 巻号頁・発行日
- vol.59, no.1, pp.275-282, 2014 (Released:2014-06-13)
- 参考文献数
- 10
The purpose of this study was to evaluate the relationships between race performance and cycle characteristics in a 10-km classic-style men's cross-country ski competition. The subjects were competitors in the 89th Japan National Ski Championships. Skiing motions of the subjects on flat stretches (1.5 km and 6.5 km) and uphill slopes (1.7 km and 6.7 km) were videotaped using two high-speed cameras. Cycle characteristics were calculated based on measurement of hip displacement and cycle time. It was revealed that elite competitors (1) performed at high velocity at all measurement points, (2) reduced their velocity in the last half of the race, (3) achieved a high velocity in double poling and diagonal stride, (4) increased their cycle length and cycle rate when employing the double poling technique, and (5) increased their cycle length when employing the diagonal stride technique.
- 著者
- 吉野 昌恵 袴田 智子 元永 恵子 石毛 勇介
- 出版者
- 独立行政法人 日本スポーツ振興センター国立スポーツ科学センター
- 雑誌
- Sports Science in Elite Athlete Support (ISSN:24322091)
- 巻号頁・発行日
- vol.3, pp.79-92, 2018
This paper reports the efforts undertaken to provide nutritional support for the Japanese National Paralympic Alpine Ski Team from the 2015/2016 season to the Pyeongchang 2018 Paralympic Winter Games. According to the team coaches, increased fatigue and reduced performance was observed around the end of a season. They attributed this to deficient fluid intake during training sessions and deficient food intake after exercise. At first, we examined the dehydration status and body mass variation of the athletes during the 2015/2016 season. Dehydration is usually detected by measuring the subject's body weight both before and after exercise, but body weight measurement during ski training may be difficult for paralympic alpine skiers. We tried to assess the hydration status of the athletes by measuring urine specific gravity (USG) on the first morning and checked urine color using a color chart as well as measured the body weight. Both parameters were monitored for 7days in the early 2015/2016 season. Some athletes had high USG (≥1.030), and showed body weight loss during the examination. We were concerned about dehydration on the first morning and body weight loss during the long season. Preventing dehydration and maintaining body weight during the season was crucial for the team. However, drinking large volumes of water on snow is difficult. Therefore, we encouraged fluid intake after a training session or competition so that they could be rehydrated by the next morning. Furthermore, consuming a snack (for example, bread, banana, and energy bar) after exercise would help in preventing energy deficiency, even if the athlete missed a meal. Additionally, we encouraged the athletes to regularly self monitor their body weight and urine color until the 2017/2018 season. With the establishment of these routines in the team, the athletes were able to maintain body weight and prevented dehydration.
- 著者
- 青田 洋一 飯塚 晴彦 石毛 勇介 持田 尚 吉久 武志 斉藤 知行
- 出版者
- 日本腰痛学会
- 雑誌
- 日本腰痛学会雑誌 (ISSN:13459074)
- 巻号頁・発行日
- vol.11, no.1, pp.179-185, 2005
- 被引用文献数
- 2 1
長時間の着座に伴う腰痛を緩和する試みとして,椅子の背もたれ部の突出(Lumbar support)の収縮による腰椎用CPMを作成した.日常生活で腰痛のない10人の健常者(平均21歳)を対象とし,2時間の持続的着座姿勢を維持させ腰痛,腰の張り,疲労感,臀部の痺れをLumbar supportのない椅子,Lumbar supportのある椅子,CPMの3つの状態でのvisual analogue scalesを用いて比較検討した.Lumbar supportのない椅子と比べLumbar support付きでは腰痛と全身の疲労感は有意に改善したが,CPMではさらに臀部のしびれも有意に改善した.また追加実験によりCPMによる全身の動きは骨盤の動きに比べ,頭部や下腿で動きが軽微なこと,さらにCPMにより座面の臀部表面の接触圧分布が有意に変化することを明らかにした.CPMは長時間の着座に伴う腰痛,疲労感,臀部の痺れを包括的に改善する機器として発展する可能性がある
1 0 0 0 OA アルペンスキーにおける膝前十字靭帯損傷発生メカニズムの解明およびその予防へ向けて
- 著者
- 藤田 善也 石毛 勇介 吉岡 伸輔 竹田 正樹
- 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.13047, (Released:2014-01-23)
- 参考文献数
- 10
The purpose of this study was to evaluate the relationships between race performance and cycle characteristics in a 10-km classic-style men's cross-country ski competition. The subjects were competitors in the 89th Japan National Ski Championships. Skiing motions of the subjects on flat stretches (1.5 km and 6.5 km) and uphill slopes (1.7 km and 6.7 km) were videotaped using two high-speed cameras. Cycle characteristics were calculated based on measurement of hip displacement and cycle time. It was revealed that elite competitors (1) performed at high velocity at all measurement points, (2) reduced their velocity in the last half of the race, (3) achieved a high velocity in double poling and diagonal stride, (4) increased their cycle length and cycle rate when employing the double poling technique, and (5) increased their cycle length when employing the diagonal stride technique.