STERNOCLAVICULAR JOINT MOVEMENT DURING BACKSWING IN BASEBALL PITCHING MAY BE A GOOD INDICATOR OF SHOULDER INJURY

The purpose of this study was to demonstrate the characteristics of joint movements performed by the pitchers who suffered from throwing shoulder injuries. Fourteen semiprofessional baseball pitchers participated in our longitudinal study. We captured their pitching using an optical motion capture system. We investigated their disease history once a year, for 5 years, in order to investigate the relationship between baseball-related throwing injuries and pitching mechanics. T w of the players suffered from shoulder pain and had to take a "no throw" rest for several weeks during the season. Both pitchers had a reduced range of motions for retraction at the sternoclavicular joint during backswing. However, they presented the same range of motions for shoulder horizontal abduction, as the other healthy pitchers

Change of athletic record and power generation capacity throughout the two years in long distance runners

J-GLOBAL ID : 201401079533207271J-GLOBAL ID : 201701005445265627J-GLOBAL ID : 200901009625371738The purpose of this study was to examine the relationship between Athletic record, maximal anaerobic power and middle power generation capacity throughout the two seasons in collegiate long-distance runners. 　The subjects were 18 male collegiate long-distance runners. In this study, the athletic record was measured throughout the season1 and season 2. The maximal anaerobic power, middle power and middle power to peak power ratio in each season were measured by cycling ergometer (Power max VII), respectively. Subjects were classified by Athletic record based by 10,000m athletic record faster (AG) and slower (BG) than 30：30. in season 1. As a results, the Athletic record of 5,000m was improved in AG. On the other hand, the Athletic records of 5,000m and 10,000m in BG. In addition, middle power to peak power ratio in season2 was showed significantly higher than that of season1 in BG. The change ratio of middle power to peak power ratio was obtained BG than AG. 　From these results, it might be considered that improve the anaerobic power production capacity reflect to improve the Athletic record as in previous studies. Especially, these results suggest that improving Athletic records by improving anaerobic power generation capacity is effective for long-distance runners who have not yet reached a high level.1520578603919310720application/pdfdepartmental bulletin pape

Comparison of ground reaction force between counter movement jump and depth jump

J-GLOBAL ID : 202001020973622576J-GLOBAL ID : 201401079533207271J-GLOBAL ID : 202101011515064120J-GLOBAL ID : 2017010054452656271520578603921103232application/pdfdepartmental bulletin pape

Physical and Fitness Profiles of Collegiate Karate athletes : Comparison of Kumite and Kata athletes

J-GLOBAL ID : 201701005445265627J-GLOBAL ID : 201101073728331279J-GLOBAL ID : 201801007052633411J-GLOBAL ID : 2020010209736225761520860078899621248application/pdfdepartmental bulletin pape

Activity of knee extensor muscles evaluated by Electromyography and MC sensor method

J-GLOBAL ID : 201401079533207271J-GLOBAL ID : 202001020973622576J-GLOBAL ID : 202101011515064120J-GLOBAL ID : 201901011536506168J-GLOBAL ID : 201801000910828540J-GLOBAL ID : 201701005445265627In this study, the characteristics of the muscle activity on knee extensor muscles and the interaction under the decrease of knee extension torque caused by a continuous knee extension and flexion task were evaluated by electromyography and MC sensor methods (MC). The subjects were 18 healthy males. The continuous task on 30 times knee extension isokinetic contraction was performed by dynamometer (Biodex). And measurement of maximal torque on isometric contraction was pre and post continuous task. At the same time, the muscle activity and deformation amount at the vastus medialis obliquus (VMO) and vastus lateralis (VL) muscles were measured using the surface electromyography and MC sensor method (TMG. BMC). As a result, the continuous knee extension task reduced knee extension torque by 10％. In addition, the muscle activity at the VMO and VL higher in post than pre during the continuous knee extension task. However, the deformation amount was lower in post than in pre during the high-intensity (over the 30％MVC) torque exertion. Moreover, the significant correlations were observed between the relative values of VMO and VL muscle activity and deformation amount pre and post the continuous knee extension task, respectively. Therefore, although the evaluation methods were different, coordinated muscle activity and deformation amount between VMO and VL were confirmed.22K115821520578603916839936application/pdfdepartmental bulletin pape