著者

萩原 正大 山本 正嘉

出版者

一般社団法人日本体力医学会

雑誌

体力科學 (ISSN:0039906X)

巻号頁・発行日

vol.60, no.3, pp.327-341, 2011-06-01

参考文献数

58

被引用文献数

5

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We simulated mountain climbing using walking on a treadmill in order to systematically evaluate the physical load during mountain climbing. The conditions of three types of load-(1) inclination of the walking path (walking uphill and downhill), (2) walking speed, and (3) backpack weight-were varied within the range assumed for normal mountain climbing (40 sets of conditions in total). When the three types of load were expressed as vertical work rate, energy expenditure (VO₂) during walking uphill and downhill was distributed along roughly the same curve. The following characteristics of walking uphill and downhill were observed.<br>A. Walking uphill<br>For all three types of load, increase in load gave a linear increase in VO₂ and heart rate (HR). A lactate threshold (LT) appeared at an intensity of 62%VO_2max, when HR was 78% HR_max. Rating of perceived exertion (RPE) was evaluated for the &ldquo;Breathlessness&rdquo; and &ldquo;Leg Fatigue&rdquo;, and both of these increased roughly in proportion to %VO_2max.<br>B. Walking downhill<br>When walking downhill, VO₂ was 35-50% the intensity of VO₂ when walking uphill on the same slope and at the same speed. Energy expenditure did not exceed 60%VO_2max in any of the load conditions, and no LT was seen. RPE values were higher for walking downhill than walking uphill, even when %VO_2max values were the same. RPE values for the &ldquo;Leg Fatigue&rdquo; tended to be higher than for the &ldquo;Breathlessness&rdquo; at the same speed in downhill walking.<br>Using these data, we created a table giving the intensity of exercise of mountain climbing expressed as VO₂ per unit body mass and metabolic equivalents (Mets) with vertical migration velocity and total weight (Body weight + Backpack weight) as variables. This table gives mountain climbers a systematic understanding of the physical load under various mountain climbing conditions. It is likely to be of use as a reference for mountain climbers of different levels of physical fitness when practicing mountain climbing appropriate to their individual level. The present results suggest that in downhill walking, it is insufficient to express the physical load in energy expenditure (VO₂ and Mets) alone, and the load on the leg muscles must also be judged using the RPE in the &ldquo;Leg Fatigue&rdquo;.

著者

鎌田 真光

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.69, no.1, pp.95, 2020

著者

寺田 新

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.1, pp.127, 2016 (Released:2016-01-24)

著者

大森 肇 八田 秀雄

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.69, no.1, pp.123, 2020

著者

矢野 博己 小栁 えり

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.67, no.1, pp.68, 2018 (Released:2018-01-19)

著者

山本 直史 萩 裕美子 吉武 裕

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.56, no.2, pp.257-268, 2007-04-01 (Released:2007-05-25)

参考文献数

52

被引用文献数

1 6

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The purpose of this study was to examine the effects of walking 10,000 steps/day on the body composition, blood pressure, blood biochemical parameters and physical fitness. Sixty-one women, aged 56.0±5.3 yrs (mean±SD), participated in a hyperlipemia prevention program. The length of the program was 90-min and it was performed one time per week for 3 months. The program consisted of stretching and aerobic exercise (cycle exercise, walking or aerobic rhythmic gymnastics). The participants were asked to walk 10,000 steps/day or more during the program. The number of steps and physical activity (PA) were monitored using a single-axis accelerometer during the program. PA was categorized into three activity levels, namely light (L), moderate (M) and vigorous (V) PA. After 3 months in the program, the participants were divided into two groups according to the average number of steps taken daily during the program : one group (GA) walked more than 10,000 steps/day, while the other (GB) walked below 10,000 steps/day. The time spent in LPA, MPA and VPA in GA were significantly longer than in GB (LPA : 79.4±19.2 min VS 58.2±10.0 min, MPA : 38.5±9.6 min VS 21.6±6.1 min, VPA : 6.3±4.9 min VS 2.6±2.0 min, p<0.001). Decreases in the percent body fat (p<0.001), body fat mass (p<0.001), fasting glucose (p<0.001), hemoglobin A1c (p=0.026), and triglyceride (p=0.036) and an improved performance when balancing on one leg while standing with eyes closed (p=0.027) were found respectively after the program for GA. These findings indicated that GA affected the percent body fat (p=0.036), body fat mass (p=0.040) and fasting glucose (p=0.009). According to a stepwise multiple regression analysis, the time spent in MPA showed a significantly negative correlation with the change in the body fat mass (p=0.025), and the change in the body fat mass showed a significantly positive correlation with the change in the fasting glucose (p<0.001), hemoglobin A1c (p=0.002) and triglyceride (p<0.001). We thus concluded that walking 10,000 steps/day resulted in an increased amount of time spent in MPA, and thus leading to decrease in the amount of body fat. This decrease in body fat is also considered to contribute to improvement in the coronary risk factor profiles.

著者

長谷川 伸 岡田 純一 加藤 清忠

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.57, no.1, pp.131-140, 2008-02-01 (Released:2008-08-06)

参考文献数

23

被引用文献数

1

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The purpose of this study was to investigate sex differences in the muscle volume (MV) of the iliopsoas, psoas major, and iliacus muscles, normalized by fat free mass (FFM), in the elderly. The subjects were 15 males and 15 females 65 years of age or over. Serial transverse 1.5T magnetic images (10 mm slice) of each subject were taken between the 12th thoracic vertebrae and the lesser trochanter. FFM was measured with a bioelectrical impedance analyzer. The mean MV of each muscle on the right and left sides were calculated and used for regression analysis of the relationship between MV and FFM.A significant correlation was observed between MV and FFM of the iliacus in both sexes (p<0.01), but not between the MV and FFM of the psoas major. MV normalized by FFM and cross-sectional area (CSA) normalized by FFM2/3 showed significantly greater values for the psoas major in the males than in the females (p<0.001), but there was no sex difference in the MV or CSA normalized by FFM of the iliacus.These results suggest that elderly males tend to have a greater muscle volume and cross-sectional area of the iliopsoas than elderly females, and that these sex differences are attributable to differences in the psoas major.

著者

森田 恵美子 横山 久代 竹田 良祐 山科 吉弘 河合 英理子 福村 智恵

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.69, no.4, pp.317-325, 2020-08-01 (Released:2020-07-15)

参考文献数

49

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We examined the relationship between masticatory ability and bone mineral density (BMD) and the role of muscle strength in those relationships in 156 female university students. Masticatory ability was assessed using a color-changeable chewing gum method. The BMD of the calcaneus was measured using quantitative ultrasonography and represented by a T-score, the standard deviation (SD) from the mean BMD of young adults. Body composition, grip strength, physical activity level, and daily nutrient intake were also assessed. Osteopenia, defined as the T-score < ‒1.0 SD, was present in 43 participants (27.6%). There was no significant relationship between masticatory ability (ΔE) and T-score in all participants. In participants with normal BMD (T-score ≧ ‒1.0 SD: the normal BMD group), masticatory ability significantly correlated to BMD (r = 0.289, p = 0.002). There was significant correlation between ΔE and grip strength neither in all participants nor in either group, although the grip strength in the normal BMD group was greater than that in the participants with osteopenia (the low BMD group) (p = 0.039). Physical activity level was positively correlated to the total daily energy intake (r = 0.193, p = 0.041) only in the normal BMD group. The present results suggest that masticatory ability is associated with BMD in young females with normal BMD, but the role of muscle strength in those relationships remains unclear. Meanwhile, there was no relationship between masticatory ability and BMD in young individuals with lower BMD.

著者

八田 秀雄

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.1, pp.125, 2016 (Released:2016-01-24)

著者

横堀 栄 中村 常弘

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.11, no.3, pp.123-129, 1962-11-01 (Released:2010-09-30)

参考文献数

4

著者

星川 佳広 飯田 朝美 村松 正隆 内山 亜希子 中嶋 由晴

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.55, no.2, pp.217-228, 2006-04-01 (Released:2007-05-10)

参考文献数

22

被引用文献数

7 4

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The aim of the study was to measure the cross-sectional area of the psoas major muscle (P-ACSA) in high school athletes and to produce a P-ACSA index independent of body size using an allometric modeling approach to examine the differences in gender and sport specialization. The subjects were 254 female (16.8±0.8 yrs) and 540 male (16.9±0.8 yrs) high-level high school athletes from 17 different sports. Fat-free mass (FFM) was measured by the Bod Pod system (LMI) and P-ACSA was determined by magnetic resonance imaging at the center of the L4-L5 transverse level. Since the power function model fit the data better than a simple linear model in the correlation between FFM and P-ACSA, and the power exponent parameter was almost equal to the theoretically anticipated 2/3 in both genders, the P-ACSA per FFM2/3 as well as the absolute P-ACSA was calculated. Both of the absolute P-ACSA and P-ACSA per FFM2/3 were significantly different according to gender and the sport specialization. While volleyball and badminton players and canoeists showed smaller P-ACSA, in accordance with the previous studies on senior sprinters, high school sprinters also showed predominant development of P-ACSA regardless of gender. These results suggested that regular involvement in sprinting activity could affect the size of the psoas major muscle in high school athletes.

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

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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.

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.62, no.6, pp.588, 2013 (Released:2013-12-15)

著者

木内 敦詞 七五三木 聡 天貝 均 大野 敦也 勝田 茂

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.46, no.1, pp.77-85, 1997

被引用文献数

1

---

本研究は, 閉経後骨粗鬆症の実験モデルとしてOVXラットを用い, OVX後の骨の変化を皮質骨と海綿骨の量的変化および組織学的特徴から検討し, これらが運動負荷によりいかなる影響を受けるかを調べたものである.実験にはWistar系雌性ラットを用い, 偽手術・コントロール群 (Sham-C群) , 偽手術・トレーニング群 (Sham-T群) , 卵巣摘出・コントロール群 (OVX-C群) , 卵巣摘出・トレーニング群 (OVX-T群) の計4群を設けた.卵巣摘出および偽手術は14週齢時に行い, トレーニングは17週齢より10週間のトレッドミル走とした.トレーニング期間終了時に, 脛骨を摘出後, 脱脂乾燥骨重量, 骨塩量を測定し, さらに海綿骨の組織形態計測を行った.<BR>得られた結果は以下のとおりである.<BR>1.脱脂乾燥骨重量および骨幹部骨塩量において, OVX-C群とSham-C群の有意な差異は認められなかった.しかし体重あたりの骨塩量ではOVX-C群がSham-C群に対し有意な低値を示した.また, 海綿骨の単位骨量ではOVX-C群がSham-C群よりも有意な低値を, LS/BSをはじめとする骨形成パラメータでは逆に有意な高値を示した.<BR>2.海綿骨単位骨量および体重あたりの骨塩量は, OVX-T群がOVX-C群に対し有意な高値を示した.骨形成パラメータでは両群に有意な差は認められなかった.<BR>3.上記のすべての測定パラメータで, Sham-C群とSham-T群の間に有意な差異は観察されなかった.<BR>以上の結果から, 運動は卵巣摘出による骨量の減少に対し抑制的に作用することが示された.また, これは骨形成の促進よりはむしろ骨吸収の抑制に起因する可能性が示唆された.

著者

長谷川 博 中村 励 茶園 雄大 柳岡 拓磨 岩橋 眞南実

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.69, no.4, pp.307-316, 2020-08-01 (Released:2020-07-15)

参考文献数

30

被引用文献数

2

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Intermittent exercise performance in a hot environment is lower than in temperate conditions. Cooling strategies at rest are important; however, the appropriate cooling temperature is not clear. The purpose of this study was to investigate the effect of temperature for cooling leg during half-time (HT) on intermittent exercise performance. Eleven men performed two pre-tests and three experimental trials of a 2 × 30 min intermittent exercise protocol in the heat (33°C; 50% relative humidity). During HT, three experimental conditions were set: no cooling (CON), cooling at the thigh using 12°C ice packs (COOL), and cooling at the thigh using 0°C ice packs (ICE) for 15 min. During the 2nd half, which consisted of 5 s maximal power pedaling every minute separated by 50 s of unloaded pedaling (80 rpm) and rest (5 s), the subjects repeated 2 × 15 sets of the intermittent exercise protocol. The peak power output under the COOL condition (694 ± 80 W) was significantly higher than that of the CON (653 ± 84 W). Thigh skin and deep temperatures showed a significant difference between each condition. In the COOL, thermal sensation was significantly lower, and thermal comfort was significantly higher. In a protocol that simulates intermittent athletic competitions such as soccer in a hot environment, using ice packs at 12°C to cool the thigh during HT lowered thigh skin and deep temperatures and improved heat perception and intermittent exercise performance. This cooling strategy is practical, suggesting that it would be effective for actual competitive situations.

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.63, no.6, pp.596-611, 2014 (Released:2014-12-05)

著者

矢野 博己

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.60, no.1, pp.15-16, 2011 (Released:2011-03-30)

著者

長谷川 伸 小野 高志

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.61, no.2, pp.227-235, 2012 (Released:2012-04-28)

参考文献数

39

被引用文献数

2 3

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The primary purpose of this study was to investigate whether the baseball pitchers have asymmetric characteristics of muscle thickness (MT) in upper extremities, trunk, and lower extremities because of repetitive pitching. The secondary purpose of this study was to investigate the relationship between MT and ball speed. Twenty-six college baseball pitchers participated in this study. Twenty-six sites were selected to quantify the asymmetric characteristics of MT. The MT was measured by a B-mode ultrasound. The ball speed, measured by a radar gun, was used to quantify the pitching performance. The MT of forearm, subscapula, and chest in dominant side (pitching side) were significantly greater than those in nondominant side, and the MT of abdomen, lateral abdomen, and anterior thigh in nondominant side were significantly greater than those in dominant side. On the other hand, the MT of forearm in both sides and the MT of lateral abdomen in dominant side were significantly and positively correlated with ball speed. These results suggest that asymmetric muscle thickness in upper extremity, trunk, and lower extremity in baseball pitchers resulted from repetitive pitching, and the MT of forearm and lateral abdomen are related to the ball speed.

著者

田中 千晶 岡田 真平 高倉 実 橋本 圭司 目澤 秀俊 安藤 大輔 田中 茂穂 Okely Anthony D

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.69, no.4, pp.327-333, 2020

被引用文献数

4

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<p>This study examined the relationship between meeting the World Health Organization's (WHO) 24-Hour Movement Guidelines for the Early Years and motor skills and cognitive function in preschool children. Participants were 4-year-old boys and girls in urban and rural areas (n=69). Physical activity was measured using a triaxial accelerometer (ActiGraph GT3X). Screen time and sleep duration were assessed via self-report by guardians. Meeting the 24-h movement guidelines was defined as: 10 to 13 h/night and nap of sleep, ≤1 h/day of sedentary screen time, and at least 180 min/day more than 1.5 METs. Motor skills were evaluated by the Ages & Stages Questionnaires, Third Edition (ASQ-3). Executive functions (shifting, visual-spatial working memory and inhibition) were evaluated by the Early Years Toolbox (Japanese translation). The prevalence of children meeting all three recommendations was 7.2% and 7.2% met none of the three recommendations. Children meeting physical activity recommendation had a better inhibition score compared to children meeting none of the recommendation (p=0.005). While, children not meeting the sleep recommendation had a better inhibition score compared to children meeting of the recommendation (p=0.042). In conclusion, meeting the physical activity or sleep recommendations were positively or negatively associated with the inhibition score. On the other hand, meeting none of the sedentary behaviour and the 3 recommendations was not associated with motor skills or cognitive function.</p>

著者

矢野 琢也 岡田 昌義

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.55, no.5, pp.461-468, 2006-10-01 (Released:2007-05-15)

参考文献数

15

被引用文献数

2

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The aim of this paper is to investigate the effect on the physiological response of fluid ingestion before walking in a swimming pool. Nine healthy students were candidates for this study. First of all, they were divided into two groups water ingestion (W(+))(300Ml) before pool walking group and no water drinking (W(-)) beforehand. Body temperature was measured in the tympanic space and venodilation was measured in the fingers. Walking conditions were 3 km/h for 1,750 m in an indoor pool with a water temperature of 29.7±0.5°C, at a room temperature of 25.4±1.4°C and relative humidity of 79.4±4.3%. The pool was 25 m in length and 1.0 m deep. The following results were obtained: The values for tympanic temperature in the W(-) group were significantly higher than that of pre-walking (p<0.05). Vasodilation of the veins in the fingers significantly expanded in the group of W(+)(p<0.05). The values of systolic blood pressure(SBP) in the W(-) group decreased significantly in comparison partially (p<0.05).We could conclude that fluid ingestion before walking in a swimming pool has a good effect on tympanic temperature, venous dilation and systolic blood pressure.