The popularity of the climbing environment has markedly increased in Japan since 2010, and it is possible that the status of climbing injuries may have also changed. However, previous studies of climbing injuries have been based mostly on data obtained before 2010, with only a very few studies using data obtained after 2011. Therefore, we conducted a survey of the actual injuries of climbing gym users using a mail survey method. We compared injury status before 2010 and after 2011 to clarify the effect of increased climbing environment on injury status. The results of the survey showed that indoor injury occurrences increased after 2011. As years of experience decreased, the likelihood of injury increased ; in other words, the period from the start of climbing to injury shortened. There was a drastic surge in climbing occurrence after 2011, and the status of climbing injury was different before 2010. Therefore, it is suggested that it is necessary to re-examine data from past research in order to prevent future injuries.
This study aimed to clarify the differences in visual search strategies based on Multiple Object Tracking (MOT) skill level using an MOT subject newly developed for soccer. Twenty-nine university soccer athletes participated in the experiment. First, in order to confirm the validity of the developed MOT subject for soccer, the participants executed both a general and the developed MOT subject for soccer. On calculating the correlation coefficient for individual subject results, we observed a significant positive correlation among them (r = .767, p < 0.001). We then divided the participants into two groups (n = 7, high MOT skill group ; n = 8, low MOT skill group) based on their scores on the MOT subject for soccer and investigated the visual search strategy that was underway as the MOT subject for soccer. We compared the migration length of the visual line in both groups and found that the length for the high MOT skill group tended to be longer than that for the low MOT skill group (t  = 1.30, n.s. ; d = 0.68). Moreover, we divided the soccer field into six areas and analyzed the rate of viewing time. We found that both groups may have used a visual search strategy that involved emphasizing ball movement and the chase-targeted athletes’ motion. Finally, we precisely investigated the time-series visual line data of the MOT subjects for soccer, and the results indicated that the high MOT skill group may have been moving the visual line in anticipation of the next playing scene. We thus developed the general MOT subject specifically for use in soccer. Moreover, these results indicate that MOT skill may have correlated with the prediction accuracy of the play at the scene, along with situation judgment, owing to MOT skill.
The analysis of sports data using GNSS has spread to the managers of high-performing soccer and rugby teams, but it has only received limited attention in other sports. This may be because the device and operating costs of GNSS receivers are high, and analysis and evaluation methods have not been well established. In this study, we created a framework for sports-data analysis, creating and formalizing methods of analysis and evaluation, without regard to cost. We first examined operations of rugby squads that regularly use GNSS data. For such teams, distance, speed, sprinting speed, acceleration, and deceleration are analyzed using GNSS data, and the results are used for training. Through the display of higher-level data for each player, their motivation for athletic training has improved. In addition, through combining GNSS data, heart rate, and vital and conditional data, the coaches can control the strength of the training and prevent injuries to the players. Furthermore, tracking data can be used together with video, and play style and play areas can mostly be confirmed in game scenarios. These results showed the frameworks that contribute to GNSS data to be physical training, motivation, prevention of injury, and game tactics. We also collected GNSS data for sport performers in field hockey, tennis, and triathlon, organized data around each of the four elements, and received an expert review. The framework was found to be able to confirm at a glance how GNSS data can help not only in rugby but also in field hockey, tennis, and triathlon to enable coaches and athletes to smoothly discuss performance.
The purpose of this study was to examine the effects a team building (TB) program for human resource development in elite youth soccer players. For this purpose, we conducted a TB program for 35 elite youth players (Mage = 16.57, SD = 1.065) belonging to the youth academy of a professional football club in Japan. This TB program was composed of specialized tools such as TPI (Todai Personality Inventory) and organization development methods based on the principles of transactional analysis. We used the Sport Self- management Skill scale (Takemura et al., 2013) and the Belief in Cooperation Scale (Nagahama et al., 2009), to examine the effects of this TB program from the viewpoint of before-after study. Responses to these questionnaires were collected from the participants before and after the intervention of this program. Furthermore, to verify the effects qualitatively, we collected free descriptions about the impressions of the program from participants. The paired t-test showed that the scores of subscales ("usefulness of cooperation" and "individual orientation") in the Belief in Cooperation Scale were significantly changed after the experience of the TB program (p< .001). Moreover, it was shown that the score of Sport Self-management Skill was improved by this TB program (p<.001). From the text analysis, based on the KJ methods, various factors about the program’ s effects were clarified, such as promotion of “self-understanding”, “clarification of own problems”, “goal setting” and so. These results suggest that this TB program is effective for promoting human resource development for elite youth soccer players, and it can be said to be a practical and academically important discovery.
Purpose : To verify, quantitatively, how difficult the effects of release velocity ［RLV］ and the rotational velocity ［RTV］ of four-seam fastballs are for batters to hit and the effect of the RTV of fastballs on the type of shots in college baseball. Methods : Eight hundred forty fastballs thrown by University A’ s 11 pitchers in the 2017 league games were analyzed. The RLV was measured by a device installed in the stadium. The RTV were estimated by the RLV with the regression model, which was calculated from the data measured by the tracking system during the training session. To assess the difficulty to hit, a logistic regression analysis was used. To examine the type of shots, a chi-square analysis was used. Results : The RLV was significantly associated with swing and miss (odds ratio ［OR］=1.07, 95% confidence interval ［CI］ : 1.01-1.13), after adjusting for the number of strikes, meeting the minimum plate appearance requirement, and batting average. Compared with the moderate RTV fastballs (exceeding 1,928.7 rpm and 2,304.7 rpm or less ; the reference group), the high RTV fastballs (above 2,304.7 rpm) showed a significantly higher OR (1.90, 95%CI : 1.17-3.10) of swing and miss. The OR of shots into the fair zone (0.63, 95%CI : 0.42-0.95) and of making a base hit (0.49, 95%CI : 0.25-0.97) were significantly lower among the high RTV fastballs. A significant interaction was found between the estimated RTV and the type of shot (x2=8.47, df=2, p=.014). Conclusion : The higher the RLV of four-seam fastballs the more likely the result of a swing and miss. The high RTV fastballs result more likely in a swing and miss, less in shots into the fair zone and less in making a base hit, than the moderate RTV fastballs. The low RTV fastballs more likely result in grounders.
It has been said that sponsoring in-house sports teams can help to increase teamwork and loyalty within a firm, though sufficient evidence-based studies have not been done to substantiate this claim. This research aimed to examine the positive impact of a corporate sponsored sports team on its employees, primarily by measuring the following three factors ; 1) corporate shared-value, 2) both internal and external communications, and 3) employees’ attachment to and pride for the company. A questionnaire was sent to all 28,000 employees of Seino Holdings Co., Ltd., which sponsors a corporate baseball team for its employees, and 6,440 valid responses were received. 36.1% of the respondents said they had interest in the team, while 35.7% answered they were neutral toward it, and 28.8% answered that they were not interested in it. Furthermore, 12.3% of the respondents answered that they had participated in the baseball team activities. Both of the groups that showed interest or participated in the team scored higher in all three factors, compared to non-interest / non-participants (p<0.01). The results suggest that engagement of employees in corporate sponsored sports teams contributes to a deepening of inter-organizational relationships, helps to cultivate a collaborative corporate culture, and increases team spirit.