- 著者
- 吉本 隆哉 千葉 佳裕 為末 大 大沼 勇人 谷中 拓哉 松林 武生 杉崎 範英 礒 繁雄 山崎 一彦
- 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.65, pp.495-505, 2020 (Released:2020-08-26)
- 参考文献数
- 33
This study was designed to clarify the relationships between the muscle cross-sectional area of the trunk and thigh and 400-m hurdle time in 12 young adult male athletes include a bronze medalist in the world championships (height 175.4 ± 6.0 cm, body mass 67.9 ± 5.8 kg, 400-m hurdle time 47.89―55.41 s). Crosssectional images from the origin to insertion of the trunk and thigh muscles were obtained using magnetic resonance imaging (MRI). These images were used to calculate the absolute cross-sectional areas of each muscle as indices of muscularity. Stepwise multiple regression analysis was performed to examine the association between the indices and 400-m hurdle time. This analysis produced an equation (adjusted R2 = .868) with the semitendinosus (β = −0.611, P = .001), quadratus lumborum (β = −0.300, P = .044) and adductor brevis (β = −0.395, P = .014) as the explanatory variables. It was concluded that individual differences in 400-m hurdle performance can be explained by the semitendinosus, quadratus lumborum and adductor brevis.
- 著者
- 山中 亮 松林 武生 佐伯 徹郎 榎本 靖士 山崎 一彦 杉田 正明
- 出版者
- 一般社団法人日本体力医学会
- 雑誌
- 体力科学 (ISSN:0039906X)
- 巻号頁・発行日
- vol.65, no.3, pp.307-313, 2016-06-01 (Released:2016-05-14)
- 参考文献数
- 24
- 被引用文献数
- 1 1
The purpose of this study was to examine the relationships between running performance and the cross–sectional area of the psoas major, peak oxygen uptake, and running economy in male junior long–distance runners. The subjects were 37 male junior athletes who achieved good records in interscholastic athletic competition during 5 years (2011–2015). Their seasonal best times in a 5,000 m race (5,000m–SB) were 14:04.11 ± 0:07.25 (13:53.64–14:16.15). In a multiple regression analysis, 5,000m–SB was statistical significantly correlated with the cross–sectional area of psoas major (16.0 ± 1.7 cm2) measured on magnetic resonance imaging and peak oxygen uptake (4.25 ± 0.36 l min-1 [76.9 ± 5.8 ml min-1 kg-1]) during a lactate curve test comprising five stages. However, 5,000m–SB was not related to oxygen uptake at the work–load which was less than the load at the lactate threshold estimated by using the lactate curve test results. These results suggest that a high volume of the psoas major, the largest hip–flexor muscle, and peak oxygen uptake are among the important factors for junior long–distance runner performance.
- 著者
- 田村 俊和 加藤 仁美 松林 武 古田 智弘 チャタリジ デボスリ 李 穎
- 出版者
- 日本地形学連合
- 雑誌
- 地形 (ISSN:03891755)
- 巻号頁・発行日
- vol.23, no.4, pp.675-694, 2002-10-25
- 参考文献数
- 17
- 被引用文献数
- 4
This paper presents the results of observations at different hilly watersheds in Sendai area in different periods with the aim at contributing to the study of pipe-flow initiation, pipe-outlet shift and surface-slide occurrence on valley-head slopes with increase in rainfall. The critical rainfall for the initiation of pipe-flow at channel-heads is variable with rainfall characteristics including antecedent precipitation, and with micro-topographic, pedologic and geologic conditions of the valley-head. Soil pipes at more upstream position begin to operate when total rainfall increases, for instance, in a 2 or 3 hour storm with the intensity of more than 5-10 mm/h without antecedent precipitation. This is considered the results of stepwise expansion of contributing areas and contributing soil-mass. Sediment discharge and opening of new pipes as results of intra-pipe erosion and small-scale failures occur in the case of an almost yearly storm, i.e., several tens of millimeter of total rainfall with over 10 mm/h of maximum intensity After a storm, pipe-flow continues longer on the hilislopes where deep weathering crust of andesite is distributed than on the hilislopes composed of semi-consolidated siltstone or sandstone. It is considered to be due to water-supply from saprolite to soil pipes. Surface slides are triggered with an intense rain of about 30 mm/h following to a 10 to 15 hour storm with the intensity over 10 mm/h on lower hillslope segments, particularly immediately below the convex break of slope at the lower margin of head hollows. Stronger storm, for instance, a 80 mm/h rain following to a 3 hour storm reaching to 170 mm, induces surface slides on upper hillslope segments, particularly headmost walls. Pipe outlets are observed on any slide scar. These phenomena suggest that working pipe network is switched several times with the increase of both total rainfall and rainfall intensity.