著者
Keita Suzuki Satoshi Nagai Ryo Ogaki Koichi Iwai Takuo Furukawa Shumpei Miyakawa Masahiro Takemura
出版者
The Japanese Society of Physical Fitness and Sports Medicine
雑誌
The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)
巻号頁・発行日
vol.8, no.2, pp.79-88, 2019-03-25 (Released:2019-03-16)
参考文献数
28
被引用文献数
1

The purpose of this study was to clarify the tackling characteristics of tacklers relationship causing concussion based on match video records in the collegiate rugby union. Twenty-three tackling situations leading to concussion were identified based on injury data and video records. Additionally, 94 tackling situations in which concussion did not occur were extracted from the same matches. Overall, one hundred and seventeen tackling situations were analyzed in detail, and categorized into three tackle phases and outcomes. Logistic regression analysis was performed to clarify which tackling characteristics in the tackler relationship had a higher chance of concussion. The chance of concussion occurring to a tackler was significantly higher for collision tackle (odds ratio [OR] 84.00, 95% CI 8.27–853.11), making initial contact with tackler’s head/neck (OR 23.47, 95% CI 4.80–114.71), no arm usage by tackler (OR 3.54, 95% CI 1.23–10.20) and tackle break by ball-carrier (OR 5.76, 95% CI 1.67–19.85). Conversely, tacklers were significantly less likely to suffer concussion when the ball-carrier performed a side step before initial contact (OR 0.11, 95% CI 0.01–0.85). In conclusion, tackles leading to concussion were related to various factors in the time period before and after tackle as well as in the moment of tackle. The results of this study suggest that further research needs to be done, given the relationship between each tackling characteristic. Moreover, we consider that players and coaching staff should improve tackle skill safety by clarifying the common contributing factors to both suffering concussion and tackle performance.
著者
山本 正嘉 山本 利春
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.1, pp.82-92, 1993-02-01 (Released:2010-09-30)
参考文献数
38
被引用文献数
4 2

自転車エルゴメーターを用い, 5秒間の全力駆動を8セット反復するという激運動を行い, 33分間の休憩後に同じ運動を繰り返した.休憩中10分間にわたり, ストレッチング, スポーツマッサージ, 軽運動 (被検者の無酸素性作業閾値の80%相当の強度) , ホットパックの4種類の回復手段を実施し, これを実施しないで安静にして回復した場合と比較検討した.疲労回復の指標として作業能力および血中乳酸濃度 (La) の回復をみた.被検者は各回復手段について12名ずつとした.結果は以下のとおりである.1.ストレッチングとスポーツマッサージは, Laの回復には有意な効果をもたらさなかったが, 作業能力の回復には有意な効果をもたらした.2.軽運動は, Laの回復には有意な効果をもたらしたが, 作業能力の回復には有意な効果をもたらさなかった.しかし, 作業能力の回復が悪かった被検者の多くは, 軽運動の運動強度が強すぎたと訴えていたことから, これらの被検者には運動強度をさらに低く設定することによって作業能力の回復にも有意な効果がもたらされる可能性がある.3.ホットパックは, Laの回復にも, 作業能力の回復にも有意な効果をもたらさなかった.4.1~3の結果から, 激運動後に作業能力の回復を促進する手段として, ストレッチングとスポーツマッサージは有効であると考えられる.軽運動については, 運動強度が適切に処方されるならば有効と考えられるが, さもないと逆効果となる可能性もある.5.Laの回復率と作業能力の回復率との間には, 有意な相関関係は認められなかった.したがって, 作業能力の回復を規定するのはLa以外の要因であることが示唆された.また, Laを作業能力の回復を表す指標とすることには問題があることが示唆された.
著者
森丘 保典 伊藤 静夫 大庭 恵一 原 孝子 内丸 仁 青野 博 雨宮 輝也
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.52, no.3, pp.285-294, 2003-06-01 (Released:2010-09-30)
参考文献数
36
被引用文献数
1 1

本研究の目的は, 中距離走者を対象に間欠的な漸増負荷走行テスト (MART) を行い, La動態から推定されるパワーと中距離走能力との関係を検討することであった.結果の要約を以下に示す.(1) V800m, V1500mと実験時の走力を表す最大パワー (Pmax) との間に有意な相関関係が認められた.(2) V800mとピークLa (PBLa) の60%値 (60%PBLa) を基準に算出したパワー (P60%La) , V1500mとPBLaの40%値 (40%PBLa) を基準に算出したパワー (P40%La) およびP60%Laとの間に有意な相関関係が認められた.以上のことから, MARTが中距離走能力を反映するテストとして有用であること, また, P60%Laが800m走能力, P40%LaおよびP60%Laが1500m走能力を反映する評価指標の一つとして利用可能であることなどが示された.
著者
Yasushi Kariyama Koji Zushi
出版者
The Japanese Society of Physical Fitness and Sports Medicine
雑誌
The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)
巻号頁・発行日
vol.5, no.2, pp.187-193, 2016-05-25 (Released:2016-05-14)
参考文献数
32
被引用文献数
2 4

We investigated the relationships between the lower-limb joint kinetic parameters of sprint running and rebound jump during the support phases in 16 male track and field athletes performing sprint running and rebound jump at maximal effort. Sprint running velocity and rebound jump index (i.e., jump height divided by contact time) during rebound jump were calculated. Lower-limb joint kinetic parameters (joint torque and power) during the support phases of these activities were calculated using a force platform and data from a high-speed video camera that recorded movements in the sagittal plane. No significant correlation was observed between sprint velocity and rebound jump index. However, significant correlations were observed between sprint running and rebound jump for mean ankle-joint torque and mean knee-joint torque in the eccentric and concentric phases, as well as for mean negative ankle-joint power and mean negative knee-joint power. These results suggest mechanical similarities in ankle- and knee-joint kinetic parameters, especially in the eccentric phase of sprint running and rebound jump, although such similarities were not observed for sprint velocity and rebound jump index.
著者
林 直亨 中村 好男 村岡 功
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.44, no.2, pp.279-286, 1995-04-01 (Released:2010-09-30)
参考文献数
22
被引用文献数
1 1

A study was conducted to investigate the effect of exercise intensity on the recovery of autonomic nervous activity after exercise. Ten subjects performed four kinds of 10-min cycle exercise with target heart rates of 100, 120, 140, and 160 beats/min (THR 100, THR 120, THR 140 and THR 160, respectively) following 5 min of exercise to increase the heart rate to the target level. The beat-by-beat variability of the R-R interval was recorded throughout the experiment including the 5-min pre-exercise control period and the 30-min recovery period. Spectral analysis (fast Fourier transform) was applied to every 5-min R-R interval data set before, during ( 5-10 min) and after exercise at the target heart rate. The low- (0.05-0, 15 Hz : P1) and high- (0, 15-1.0 Hz : Ph) frequency areas were calculated to evaluate sympathetic (SNS) and parasympathetic (PNS) nervous activities as P1/Phand Ph, respectively. During exercise, SNS of THR 160 was significantly higher, and PNS of THR 140 and THR 160 was significantly lower than the respective pre-exercise values (p<0.05) . Althouglt all indicators recovered to, or overshot the pre-exercise values at 20-30 min after THR 100 and THR 120, heart rate and SNS were still higher and PNS was still lower than the pre-exercise value after THR 160. These results suggest that the recovery of cardiac autonomic nervous activity is slower after high-intensity exercise than after low-intensity exercise, and that the recovery of autonomic nervous activity after acute exercise does not always corrrespond linearly on the exercise intensity.
著者
Kei Tsukioka Ko Yamanaka Hidefumi Waki
出版者
The Japanese Society of Physical Fitness and Sports Medicine
雑誌
The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)
巻号頁・発行日
vol.8, no.1, pp.45-50, 2019-01-25 (Released:2019-01-17)
参考文献数
14

The amygdala induces emotion and controls the cardiovascular system. We previously found that lesions in the central nucleus of amygdala (CeA), which is associated with negative emotion, chronically increase the arterial pressure (AP); however, the mechanism involved in this process remains unclear. In this study we compared the heart rate (HR), high frequency (HF) component of HR variability as an index of cardiac vagal outflow, and spontaneous baroreceptor reflex gain (sBRG) before and after the occurrence of bilateral lesions in CeA for further understanding of cardiovascular regulation by CeA. The results showed that CeA lesions induced a chronic decrease in HR and increase in sBRG, suggesting that CeA regulates the autonomic nervous system. Taken together with our previous results, CeA was shown to control AP and HR as well as baroreflex gain; however, the mechanisms controlling basal AP through CeA are likely to be independent of mechanisms for baroreflex gain control. These contradictory findings may partially explain the known diverse hemodynamic patterns of the amygdala in response to a variety of stress conditions.
著者
富沢 政信 鳥山 貞宜 古矢 仁 小野 忠彦
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.20, no.2, pp.96-100, 1971-06-01 (Released:2010-09-30)
参考文献数
15

The Kyudo (Japanese archery) is a most popular sport among Japanese as the Judo and Japanese fencing. Even some their athletes had complains of neck pain, joint pain and back pain, the investigations in the orthopaedic aspect were rare as compared with the Judo and Japanese fencing.The orthopaedical questionnaire were made to one hundred twenty-two athletes from eighteen to seventy-eight years old, average forty-three old, and the analysis by roentgenological and clinical findings were made to thirty athletes who were had severe troubles.The results were as follows :1) Because of most disorders were localized about the upper-extremity as main action were using of arm muscles, there were discovered the osteoarthritis and osteochondro-matosis of the elbow joint, periarthritis of the shoulder joint, atrophy of the deltoid and supra-infraspinatus muscles, injury of the hand and back pain.2) To prevent these disorders, we emphasized the necessity of warming-up and other systematic exercise as usually.3) We had obtained the conclusion that the periodical examination was most important for early diagnosis and procedures of over ten years experienced athletes.
著者
藤瀬 武彦 長崎 浩爾
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.48, no.5, pp.631-640, 1999-10-01 (Released:2010-09-30)
参考文献数
37
被引用文献数
4 5

本研究では, 男子学生1278名及び女子学生707名を対象に形態及び体力測定を行い, 青年男女における隠れ肥満者の頻度を明確にするとともに形態的及び体力的特徴について検討した.1) 男性及び女性における隠れ肥満者の頻度はそれぞれ5.4%及び13.6%, また肥満者における隠れ肥満者の頻度は30.4%および66.2%であった.女性は男性の約2.5倍の隠れ肥満者が存在し, 肥満者における隠れ肥満者の頻度も女性の方が約2.2倍多かった.2) 男性の形態は, 対照群と隠れ肥満群の間に一定の傾向が認められなかった.しかし, 女性ではBMIが21以上23未満の隠れ肥満群で胴囲及びWHRが対照群より有意に高値を示した.3) 男性の体力は, BMI20群の背筋力及び握力, BMI22群の垂直跳び, BMI23群の背筋力, 及び立位体前屈で隠れ肥満群が対照群よりも有意に低値を示したが, 女性ではBMI22群の反復横跳び以外に有意差が認められなかった.4) 男性の運動能力は, BMI20群の50m走, 走幅跳び, 及び立ち幅跳び, BMI21群の50m走と走幅跳び, BMI22群の走幅跳び, BMI23群の50m走と立幅跳びで隠れ肥満群が対照群よりも有意に低値を示したが, 女性ではBMI22群の走幅跳び及びBMI23群の50m走以外に有意差が認められなかった.

1 0 0 0 OA 運動と免疫

著者
河野 一郎
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.41, no.2, pp.139-146, 1992-04-01 (Released:2010-09-30)
参考文献数
61
被引用文献数
1 1
著者
松井 知之 森原 徹 東 善一 瀬尾 和弥 平本 真知子 木田 圭重 高島 誠 堀井 基行 久保 俊一
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.62, no.3, pp.223-226, 2013-06-01 (Released:2013-06-21)
参考文献数
13
被引用文献数
2 4

The pitching motion requires neck, trunk and hip rotations. The purpose of this study was to investigate the relationship between pitching injuries and dominant versus non-dominant differences of the ranges of these motions. The subjects were 66 high school baseball pitchers who received medical checkup during baseball classes in Kyoto prefecture. During medical checkup, physical therapists measured the ranges of neck/trunk rotations, and internal rotation of the bilateral hips. Then orthopaedic doctors did special tests such as shoulder internal impingement test, subacromial impingement test, elbow valgus stress test and elbow hyper extension test. Fourteen pitchers (21.2%) who were positive in one or more special tests were judged to require second screening (injured group). In normal group, average neck/trunk rotations toward the non-dominant side were significantly wider than rotations toward the dominant side. Average hip internal rotation was significantly wider on the non-dominant side than on the dominant side. In injured group, a larger number of pitchers had wider neck and trunk rotation ranges toward the dominant side than toward the non-dominant side, and had wide hip internal rotation range on the dominant side compared to the non-dominant side. Comparing the ranges of the neck/trunk rotations and hip internal rotation between dominant and non-dominant sides might be useful for the prediction of pitching injuries of the shoulder and the elbow.
著者
松井 知之 森原 徹 平本 真知子 東 善一 瀬尾 和弥 宮崎 哲哉 来田 宣幸 山田 陽介 木田 圭重 池田 巧 堀井 基行 久保 俊一
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.63, no.5, pp.463-468, 2014-10-01 (Released:2014-10-02)
参考文献数
23
被引用文献数
1

Pitching motion is made up by three-dimensional whole body movement. Pelvic and trunk rotation movement is important for the prevention of throwing injuries. Throwing is not a simple rotation movement. Evaluation should reflect muscle strength, coordination, and pitching motion characteristics. We have devised throwing rotational assessment (TRA) similar to throwing as the new evaluation of total rotation angle required for throwing. The purpose of this study was to introduce the new method and to examine the characteristics of players with throwing disorders. The subjects were 76 high school baseball pitchers who participated in the medical check. Pain-induced tests were elbow hyperextension test and intra-articular shoulder impingement test. Pitchers who felt pain in either test were classified as disorder group. TRA evaluation was performed as follows. In the positions similar to the foot contact phase, rotation angles of the pelvis and trunk were measured. In the position similar to follow through phase, the distance between the middle finger and the second toe was measured. All tests were performed in the throwing and opposite direction. Twenty five pitchers were classified as disorder group. All TRA tests in healthy group were significantly higher in the throwing direction than in the opposite direction, but there was no significant difference in the disorder group. Disorder group had significantly lower average rotation angles of the pelvis and trunk in the throwing direction and rotation angle of trunk in the opposite direction than the healthy group. Restrictions on TRA reflecting the complex whole body rotation movement may be related to the throwing disorder. This evaluation is a simple method. It would be useful early detection of throwing disorder and systematic evaluation in medical check, as well as self-check in the sports field.
著者
内田 智也 松本 晋太朗 小松 稔 野田 優希 石田 美弥 佃 美智留 中山 良太 武田 雄大 平川 理映子 武藤 貢平 大久保 吏司 古川 裕之 藤田 健司
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.65, no.2, pp.237-242, 2016-04-01 (Released:2016-03-18)
参考文献数
32
被引用文献数
1

Recently, the problem of the high incidence of throwing injuries in young people has been gaining attention. Identifying high-risk players before the onset of the throwing injury is important for prevention. One of the most widely used screening tests for sports-related injuries is the Functional Movement Screen (FMS), which assesses the quality of movement; however, its correlation with throwing injuries has not been established. The purpose of this study was to investigate the correlation between the FMS score and throwing injuries. The FMS was used during the medical check for two hundred and thirty junior high school baseball players. We allotted those who had experienced throwing injuries multiple times to the injury group and those who had never experienced throwing injury to the control group. We then calculated the FMS cutoff value using the receiver operating characteristic curve. In addition, we investigated differences in the incidence of throwing injury between above and below the cutoff value using chi-square test. The FMS cutoff score was 17. Players who scored ≤17 had a significantly higher incidence of throwing injuries than those who scored ≥18. Conclusion: We believe that FMS score is correlated to throwing injuries. In addition, the results suggest that throwing injuries might be prevented in junior high school baseball players who scored ≤17 on the FMS if they undergo training in the correct movement patterns.
著者
杉山 康司 青木 純一郎
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.39, no.3, pp.173-180, 1990-06-01 (Released:2010-09-30)
参考文献数
44
被引用文献数
1

本研究の目的は高酸素気吸入トレーニングが平地での全身持久力に及ぼす効果を明らかにすることであった.日常規則的な持久性のトレーニングを行っていない男子体育学部生12名を被験者とし, 正常気吸入トレーニング群 (正常気群) および高酸素気吸入トレーニング群 (高酸素気群) に2分した.高酸素気群のトレーニング強度は高酸素 (60%酸素) 吸入時に得られたVo2maxの85%, 正常気トレーニング群の強度は空気吸入時に得られたVo2maxの85%とした.トレーニング時間は高酸素気群を10分とし, 両群の仕事量を等しくするために, 正常気群は10分22秒から11分30秒とした.また, トレーニングの頻度および期間は両群とも週3日および4週間であった.この結果, 正常気群ではオールアウトタイムが17分18秒±1分37秒から19分7秒±1分53秒および乳酸閾値が19.6±4.3ml/kg・分から23.0±4.5ml/kg・分にそれぞれ有意に向上した.Vo2max, 最大換気量およびトレーニング中の心拍数には変化は認められなかった.一方, 高酸素気群ではオールアウトタイムが17分56秒±1分24秒から19分33秒±1分41秒および乳酸閾値が19.7±3.0ml/kg・分から24.9±4.0ml/kg・分に有意な向上を示したことに加え, Vo2mmxおよび最大換気量にそれぞれ46.1±4.6ml/kg・分から51.0±4.3ml/kg・分および117.3±13.8l/分から135.1±18.4l/分の有意な増加が認められた.さらに, トレーニング中の心拍数については有意な減少が認められた.以上の結果から, 高酸素気吸入トレーニングは全身持久力のうちVo2maxを指標とする呼吸循環機能を改善させるのに正常気吸入トレーニングよりも効果的であると結論された.
著者
清水 宗茂 藤田 浩太郎 市川 淳 森松 文毅 向井 直樹
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.53, no.5, pp.559-566, 2004-10-01 (Released:2010-09-30)
参考文献数
21

本研究では, 関節部への負担が高い走運動愛好者を対象として, コラーゲン・グルコサミン混合液の継続摂取が関節マーカーに及ぼす影響を検討した.その結果, 30日間のコラーゲン・グルコサミン混合液摂取により, 血清KSおよび血清MMP-3が摂取15, 30日目において有意に低下することが認められた.本研究の結果は, コラーゲン・グルコサミン混合液の継続摂取が, 関節軟骨の損傷および炎症を予防し, 関節部のコンディショニングに対して有効であることを示唆するものである.
著者
野井 真吾 小沢 治夫 小磯 透 正木 健雄
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.49, no.4, pp.513-522, 2000-08-01 (Released:2010-09-30)
参考文献数
32
被引用文献数
4 3

The purpose of this study was to examine the bone stiffness of healthy girls during their growth period and factors affecting on such stiffness. The subjects were 302 secondary school girls in Tokyo. Parameters examined included the body characteristics (standing height, body weight, bone stiffness measured by ultrasound, muscle thickness measured with the ultrasound B-mode system), extension power of the lower limb (containing the knee and hip joints), and a questionnaire about the daily intake of milk, kinds of meals and number of years from menophania. These examinations were carried out in June 1997.Results were summarized as follows : 1) From the observation of bone stiffness in secondary school girls, it appears that bone stiffness increases during the junior high school period. In other words, the bone stiffness of the subjects had almost reached on adult level by high school. 2) A significant positive correlation was recognized between chronological age and bone stiffness (r=0.365, p<0.05) . A positive correlation also existed between the years from menophania and bone stiffness (r=0.477, p<0.05) . These coefficients showed that the years from menophania correlate with bone stiffness more closely in comparison with chronological age. 3) In the period when short comparatively years from menophania, body characteristics, which were the index of maturity, correlated to bone stiffness. However, muscle thickness/power, which was related to exercise habit, became the major parameter correlating with bone stiffness. These results suggest that factors affecting bone stiffness should differ according to the growth period. 4) Comparison of different athletic clubs showed that the bone stiffness of volleyball players was higher than that of control. These data suggest that physical education class, which was given 3 times a week, is not enough for total body development in both quality and quantity. In other words, physical education should be better matched with total physical development, including the growth of healthy bones.
著者
鈴木 政登
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.51, no.5, pp.407-422, 2002-10-01 (Released:2010-12-10)
参考文献数
42
被引用文献数
1 3

Numerous studies on serum enzymes derived from skeletal muscle, such as CH, AST, LDH, are also being reported in the field of sports medicine. In this article, I would like to summarize the findings on “physical exercise and serum enzymes” studied up to the present. Secondly, I will evaluate the usefulness and limits as indicators of condition and muscle fatigue in athletes. The amount of change and time course of Ch, AST, LDH and myoglobin responses were markedly different in 5-km, marathon and triathalon races, and in trained and untrained subjects. Trained subjects showed peaks of these enzymes one day after endurance running, and untrained subjects had a typical biphasic variation after endurance running. The typical change in untrained subjects might reflect a series of different histopathological changes, including muscle damage, repair and regeneration of muscles. In participants of women's marathon races, higher ranking prize winners showed lower levels before and lower increases in Ch activity after the mice than the other participants. higher serum CIA activity above 300 mU/ml accompanied by increases in serum myosin light chain I (MLC I) concentration (above 2.5 ng/ml) without increases in troponin T and CN-MIA were observed during marathon, triathalon, 100-km and 250 km ultra marathon races. The athletes who showed a higher serum CK activity above 500 mU/ml at the pre-race stage felt subjective fatigue and sonic dropped out from the race. Normal persons who had a lower Ch activity below 40.50 mU/ml indi cated lower levels of serum HDL-C and physical fitness (VO2max) . On the contrary, persons who showed a higher CR level of 100-200 mU/ml or more had higher levels of IIDL-C and VO2max.Measurement of serum CK activity might provide useful information for checking health and physical fitness levels in normal persons, and also the physical and subjective conditions of athletes.
著者
新矢 博美 芳田 哲也 高橋 英一 常岡 秀行 中井 誠一
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.52, no.1, pp.75-88, 2003-02-01 (Released:2010-09-30)
参考文献数
25
被引用文献数
3 4

The effects of fencing uniforms (U) on thermoregulatory responses were analyzed in both practical field investigation (PFI) and laboratory experiment (LE) . In PFI, six fencers (college-aged) performed regular fencing practice wearing U and wearing a short-sleeved shirt and pants (T) in summer. Rectal temperature (Tr), chest skin temperature (Tch), mask temperature (Tmk), heart rate (HR) and sweat rate (SR) were measured during fencing practice. In LE, seven male college-aged subjects performed three sessions of 20-min cycling at light intensity (250 W/m2) in a room temperature maintained at 28 WBGT (wet bulb globe temperature) . Esophageal temperature (Tes), mean skin temperature (Tsk), mean body temperature (Tb), HR, and SR were measured during exercise wearing U and in a semi-nude condition (N) . In both PFI and LE, increases in Tch, Tsk, Tb, Tes, Tr and SR were significantly (p<0.001) greater when wearing U than when wearing T and N. In PFI, the maximal value of Tr correlated significantly with the maximal values of Tch (r=0.513, p<0.001) and SR (r=0.635, p<0.001) during practice wearing U and T. In LE, positive correlations between Tsk and Tes (r=0.797, p<0.001), and between Tb and SR (r=0.658, p<0.02) were found at the end of exercise wearing U and N. In PFI, although the Tsk decreased within a few minutes of a decrease in Tmk, a significant relationship between the decrease in Tmk and Tsk or Tr was not observed during fencing practice. These results demonstrate that when wearing U, a higher skin temperature induces core temperature elevation, and higher skin and core temperatures are associated with increases in SR and HR during exercise in a hot environment. Thus, wearing light clothing during exercise, and taking off the fencing jacket and mask during rest periods would be recommended to reduce the heat stress during fencing practice in hot environments.
著者
津山 薫 藤城 仁音 中嶋 耕平 中里 浩一 中嶋 寛之
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.48, no.2, pp.251-263, 1999-04-01 (Released:2010-09-30)
参考文献数
19

A study was conducted to evaluate and compare neck muscle strength between two levels of college American football players with the aim of preventing neck injuries. The subjects were American football players at N University (n=52) belonging to the first level league and American football players at G University (n=14) belonging to the third level league. The findings were as follows.1. The neck muscle strength of freshman players at N University tended to be lower than that of senior players.2. It was shown that the neck muscle strength/body weight of experienced American football players was 10-30% higher than that of inexperienced players.3. There was a significant difference in neck muscle strength/body weight between N University and G University in 1997. However, there was no significant difference between them in 1998, because neck muscle strength/body weight of G University players increased by 13-30% after neck muscle training for about nine months. It was suggested that coaching staff must evaluate the neck muscle strength of each player, especially in freshmen who have had no experience of American football, in order to prevent neck injuries because mismatch of performance level may cause catastrophic neck injury.
著者
Shohei Dobashi Chinatsu Aiba Daisuke Ando Masataka Kiuchi Mitsuya Yamakita Katsuhiro Koyama
出版者
The Japanese Society of Physical Fitness and Sports Medicine
雑誌
The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)
巻号頁・発行日
vol.7, no.4, pp.239-245, 2018-07-25 (Released:2018-07-18)
参考文献数
40

Both exercise training and chronic caloric restriction contribute to brain health through enhanced expression of brain-derived neurotrophic factor (BDNF). This study investigated the synergistic effects between 12-week low-intensity exercise training and caloric restriction on hippocampal BDNF expression with redox status in rats. Twenty-six, 7-week-old male Wistar rats were randomly divided into the following 4 groups: (1) sedentary control (Con, n = 7), (2) exercise (Ex, n = 6), (3) caloric restriction (CR, n = 7), and (4) caloric restriction and exercise training (ExCR, n = 6). Although Con and Ex rats were fed ad libitum over time, CR and ExCR rats consumed 40% less food compared to Con rats. Ex and ExCR rats underwent low-intensity treadmill running (30 min/day, 5 days/week). Forty-eight hours after the termination of the 12-week intervention, rats were sacrificed and the hippocampus was quickly dissected for measuring BDNF expression and markers of oxidative stress, including 4-hydroxy-2-nonenal (4-HNE). Hippocampal BDNF expression was significantly increased in Ex compared to Con rats (p = 0.007), whereas the exercise-induced increase in BDNF was completely suppressed by a combination with caloric restriction. Furthermore, we observed a significant relationship between hippocampal BDNF and 4-HNE expression (r = 0.725, p < 0.001). Our findings indicate that exercise training combined with caloric restriction might not have a synergistic effect on hippocampal BDNF expression in young rats. Moreover, exercise-induced oxidative stress can trigger BDNF expression in the hippocampus.