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標題: | 大學棒球投手於重複性投擲模擬比賽後對身體質心與關節控制之影響 The Effects of a Simulated Game with Repetitive Pitching on the Control of the Center of Mass and Joints in Collegiate Baseball Pitchers |
作者: | Shiu-Min Wang 王序閔 |
指導教授: | 徐瑋勵(Wei-Li Hsu) |
關鍵字: | 棒球投手,疲勞,身體質心偏移量,身體質心變異量,關節角度,關節力矩, baseball pitching,muscle fatigue,center of mass displacement,center of mass variability,joint angles,joint moments, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 背景:疲勞累積會造成關節運動學之改變,進而影響身體質心的控制,例如:足球選手以及跑者;這些研究發現質心之變異量增加時,會影響運動員的表現而導致運動傷害增加。研究已顯示質心之變異量和運動平衡表現相關。然而,鮮少研究探討針對大學棒球選手於疲勞後身體質心之變化。 研究目的:探討經過一場模擬比賽後,大學棒球投手於身體質心及關節控制上的變化。 研究設計:橫斷性研究 研究方法:本研究受測者為全國大專院校棒球運動聯賽甲組或乙組之男性健康棒球投手,使用室內實驗室之三維動作分析系統擷取投球動作過程,分析其身體質心偏移量、關節角度、關節力矩。每位參與實驗之選手,需盡全力投出快速直球共80球,分4局每一局20球完成。投球過程中亦收集選手投球臂及跨步腳之肌電訊號、好壞球以及球速,並於每一局結束紀錄球員的自覺用力係數。統計方法為使用無母數分析之Wilcoxon符號等級(signed-rank)檢定,比較80球中之前3球數值的平均值(模擬比賽前),以及最後3球數值的平均值(模擬比賽後)。 研究結果:於模擬比賽後,身體質心顯著地朝向前方及下方偏移 (p< 0.05),且身體質心變異量於前後、左右以及上下的方向皆有顯著地增加 (p< 0.05)。髖關節屈曲角度以及膝關節屈曲角度也有顯著地增加 (p< 0.05)。自覺用力係數於第4局 (平均值= 15.7±2.36) 相比於第1局 (平均值= 11.91±2.19) 也有顯著地上升 (p< 0.01, z= -3.65)。 結論:此研究結果顯示大學棒球投手於重複性投擲模擬比賽後,會透過改變身體質心控制及關節協調以維持良好的投球表現。因此,不可以球速和精準度降低作為疲勞指標;因在球速及精準度改變之前,已產生質心及關節控制上的改變,應當偵測這些代償方式以預防疲勞所產生的運動傷害。 Background: Fatigue accumulation can alter the joint angles and then led to changes in the variability of the center of mass (CoM) considered an important parameter related to the stability of performance. However, none of these studies has examined the CoM variability during pitching in baseball players. Objective: To determine the effects of a simulated game on the control of the center of mass and joints in collegiate baseball pitchers. Design: Cross-sectional study Methods: A total of 23 college baseball pitchers were recruited from the University Baseball League. The simulated game consists of 4 innings, each inning included 20 pitches (total 80 repetitive pitches). A motion analysis system was used to evaluate the CoM displacement, and joint angles and moments. Muscle fatigue level was assessed by the rating of perceived exertion (RPE) and median frequency analysis from the surface electromyography (EMG) on the pitching arm and stride leg. Pitching performances included pitching velocity and accuracy were also recorded. Wilcoxon signed-rank test was used to compare the mean value of CoM displacement, joint angles,joint moments, CoM variability, the median frequency of EMG, and RPE, and pitching performances between before and after a simulated game. Results: After a simulated game, CoM displacement was significantly shifted forward and downward (p< 0.05), while CoM variability was significantly increased in all directions (p< 0.05). Moreover, the knee flexion and hip flexion angles were also increased significantly (p< 0.05). The RPE increased significantly (p< 0.01, z= -3.65) from 1st inning (mean= 11.91±2.19) to 4th inning (mean= 15.7±2.36). Conclusion: After a simulated game with repetitive pitching, the baseball pitchers might alter the control of CoM and joint coordination to maintain their pitching performances. Thus, the reduction of pitching speed or pitching accuracy cannot be used as the only indicator for fatigue state since the changes in the control of CoM and joints already occurred before the changes of speed and accuracy. The compensatory strategies should be monitored to prevent sports injuries in baseball pitchers. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/67283 |
DOI: | 10.6342/NTU202003575 |
全文授權: | 有償授權 |
顯示於系所單位: | 物理治療學系所 |
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