Japanese Journal of Athletic Training
Online ISSN : 2433-572X
Print ISSN : 2432-6623
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Showing 1-13 articles out of 13 articles from the selected issue
  • Satoshi SHIBATA, Masahiro TAKEMURA, Shumpei MIYAKAWA
    2021 Volume 6 Issue 2 Pages 161-170
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    There was a possibility that different landing strategies may be obtained by increasing the box height during a single-leg landing task. It was useful for prevention of ACL injury and rehabilitation. The purpose of this study was to examine the effects of different landing height on the trunk, pelvis, lower limb joint angle, joint moment, ground reaction force, and lower limb muscle activities during single-leg landing. The subjects were 17 female athletes. The motion task was single-leg landing with the dominant leg from the 30cm or 45cm height box. Measurements were performed using a three-dimensional motion analysis system, force-platform, and surface electrodes. On the 45cm-height box, increased trunk forward tilt angle and joint movements on the frontal plane and horizontal plane of the hip, trunk, and pelvis were observed. And, the increased valgus moment of the knee joint and increased quadriceps muscle activities was observed. Therefore, the landing motion had a high risk of ACL injury. It is considered that single-leg landing motion with different box height is useful for injury risk screening and rehabilitation.

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  • Hirokazu SUHARA, Miki NARIAI, Taishu KASAI, Hitoshi SHIRAKI
    2021 Volume 6 Issue 2 Pages 171-180
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    The purpose of this study was to investigate the effect of KOSHIWARI, which are traditionally performed in sumo wrestling, on range of motion of hip joint, muscle strength of around hip joint, athletic ability and dynamic balance, compared to the wide stance squat (WS-SQ), which is a typical exercise for the lower limb. The exercise intervention was conducted over 8 weeks. Each of these measurements were taken prior to the exercise intervention and again at 4 and 8 weeks. The 8-week of intervention, changes in hip abduction range of motion, hip adduction and extension strength, and dynamic balance ability were noted. In particular, there was a significant difference in hip adduction strength between KOSHIWARI and WS-SQ, suggesting that KOSHIWARI may be more effective than WS-SQ for improving muscle strength of around hip joint.

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  • Yasutaka TATSUMI
    2021 Volume 6 Issue 2 Pages 181-188
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    The aim of this study was to investigate the relationship between mood/emotion and sports injuries among freshmen and senior male members of a university rugby club. For this, the Japanese version of the shortened form of the Profile of Mood States was administered eight times between early April, 2019 and the end of July, 2019. The subjects were divided into those who had suffered sports injuries within a week after implementing the survey (hereinafter the “Injured”) (8 freshmen and 10 senior members), and those who had not suffered any sports injuries (hereinafter the “Uninjured”) (111 freshmen and 108 senior members). Results from a two-way analysis of variance demonstrated that scores on the Tension-Anxiety and Confusion subscales of the shortened form of the Profile of Mood States were significantly higher among injured freshmen compared to their uninjured counterparts. Our findings suggest the need to pay attention to signs of increased tension/anxiety or confusion among freshmen rugby players.

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  • Taisei HAKOZAKI, Shota KAWAMOTO, Seiya SAKIHAMA, Rieko KURAMOCHI
    2021 Volume 6 Issue 2 Pages 189-195
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    Subconcussive head impact in sports is a complex public health issue. Near point of convergence (NPC) values have shown to reflect subclinical neuronal damage; however, the longitudinal pattern of NPC changes in association with subconcussive head impact remains unclear. This prospective longitudinal study examined the NPC response in a single Japanese collegiate American football season through a series of repeated measurements. This prospective longitudinal study of Tokai Collegiate American Football Association Division 1 players included baseline measurements of NPC and 2 preseason practices and 2 in-season games. Outcome measures were obtained for each time (a total of 9 points). The 33 included players were all men, with a mean±SD age of 19.8±1.2 years. There was a significant difference in NPC values from baseline to post-game 2; p<0.001. Relative to baseline (mean±SD NPC: 5.90±2.16 cm), NPC values were significantly increased at post-practice 1 (7.99±2.57 cm; p<0.001), pre-practice 2 (7.29±2.57 cm; p<0.001), post-practice 2 (8.03±2.40 cm; p<0.001), post-game 1 (7.09±2.41 cm; p<0.01), and post-game 2 (7.18±2.15 cm; p<0.01). This longitudinal case study suggests that Japanese collegiate American football players experienced changes in NPC as the competitive season progressed. The oculomotor system may have an adaptive capacity to subclinical head impact, regardless of race or ethnicity; nevertheless, the mechanism for such an adaptive capacity remains an open question and warrants further investigation.

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  • Taishu KASAI, Hiroshi KAMADA, Ryoichi NAKAJIMA, Hitoshi SHIRAKI
    2021 Volume 6 Issue 2 Pages 197-206
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    The purpose of this study was to investigate the characteristics of medical support for children conducted by a specialist in physical education and sports medicine in cooperation with Yogo teacher (= school nurse) at a public elementary and junior high school. The survey was conducted at one public elementary and junior high school in Ibaraki Prefecture for two years from the 2017 to 2018 school year. A certified athletic trainer by the Japan Sports Association and a licensed health and physical education teacher visited the school to provide medical supports for health education on the musculoskeletal system during the growth period. As a result, the rate of utilization was increased with the continuous support activities particularly in the age of junior high school students. In terms of the content of supports, the percentage of “physical consultation” was higher than “first aid”. Providing “icing”, “exercise procedure”, and “taping” were specifically frequent. It is necessary to continue to examine a system that enables us to collaborate with school nurses and teachers effectively.

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  • Keigo ODA, Ryo OGAKI, Junichi HIRONO, Keiko YAMADA, Shumpei MIYAKAWA
    2021 Volume 6 Issue 2 Pages 207-211
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    The purpose of this prospective study was to investigate the injuries in Japanese female collegiate basketball players during one season. We investigated the injury rate, injury situation, types of injury, location, severity, and days until full recovery and return to play.

    Overall, 13 injuries were documented and the injury rate was 1.36/1000 player-hours. The most frequent injury location was at the ankle. Of all the injuries, 84 % were severe injuries that required more than 29 days until full recovery and return to play.

    In comparison to previous studies, it took longer for full recovery and return to play. Based on this assessment it is considered necessary to take measures towards injuries introducing prevention methods to offset these occurrences for the future.

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  • Norikazu HIROSE, Kenro ONOZAKI, Seiichi SAKUNO
    2021 Volume 6 Issue 2 Pages 213-220
    Published: April 30, 2021
    Released: August 19, 2021
    JOURNAL FREE ACCESS

    This study examined the experiences in sports, lifestyle, previous and present history of injury and illness, physical and mental burden during sports activities, general health concerns, and request of professional support in 141 junior high school students who belonging extracurricular sports club in public junior high school using paper pencil questionnaire. As the result, high severe past injury proportion was observed in students who experienced zero, three or four kinds of sports event in their childhood. A short sleep duration was observed in test period, and this trend was remarkable in girl. A skipped breakfast was observed in 3.8% of boy and 7.4% of girl, and their sleep duration tended to be shorter than the average value of all participants. The awareness in sleep of both gender, and that in physical condition of girl were higher than that in nutrition. In addition, a lot of participants seek for the professional support of training in muscular strength, sports specific technique, and physical fitness. These results suggested that understanding individual history of past sports experiences, life style such as sleep duration and skipped breakfast, and awareness in general health is crucial for managing safety and health management in junior athletes.

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