- 期刊
Effects of Whole Body Vibration and Electromuscular Stimulation Recovery Methods Used Between-Inning on Baseball Pitching Performance During a Simulated Game
全身性振動與肌肉電刺激之局間恢復模式對模擬賽中投球表現之影響
摘要
This study evaluated the effects of passive muscle contraction recovery treatments, namely whole body vibration (WBV) and electromuscular stimulation (EMS) on average pitch speed, rating of perceived exertion (RPE), heart rate (HR), and blood lactate concentration of baseball pitchers during a simulated game. Nine Taiwan Division I intercollegiate baseball pitchers (starting pitchers) volunteered for this study. All pitchers received 3 recovery treatments: WBV, EMS, and control (CON) in a counter balance order. A within-subject crossover design was employed, and each experiment was separated by a 7-day interval. Pitch speed during a simulated game (pitcher performed 5 innings; 20-pitch counts per inning) was recorded. During each experiment, the pitcher received 1 of the 3 recovery treatments after each inning: WBV for 6 min (frequency: 50, 40, and 30 Hz applied for 2 min in sequences separately; amplitude: 1.5 mm), EMS for 6 min (frequency: 9, 8, and 7 Hz applied for 2 min in separate sequences), and CON (resting for 6 min). Changes in HR, RPE, and blood lactic acid (BLa) were recorded before and after recovery treatments. The results of the present study indicated that average pitch speed of WBV was significantly higher than EMS and CON. In addition, the concentrations of BLa in WBV and EMS were significantly lower than CON at post-measurement, but no significant difference between WBV and EMS. Furthermore, RPE in WBV was significantly lower than CON. The results suggest that WBV and EMS as passive muscle contraction recovery methods can decrease fatigue index (BLa levels) between innings during a simulated pitching game, but the WBV can improves pitching performance more effectively.
並列摘要
本研究目的在探討模擬賽中進行全身性振動（whole body vibration, WBV）與電刺激（electromuscular stimulation, EMS）等被動肌肉收縮的恢復處理方式對於投手模擬賽中平均球速、自覺量表（rating of perceived exertion, RPE）、心跳率（heart rate, HR）與血乳酸（blood lactate, BLa）濃度之影響。本研究以9名大專公開組第一級棒球隊之先發投手為研究對象。參與者以重複量數、對抗平衡次序設計分別進行全身性振動恢復處理（WBV）、電刺激恢復處理（EMS）與對照處理（CON）等3次實驗，每次間隔7天。在每一次實驗中，投手進行投球（投5局；每局投20球），並且記錄每局平均球速。每局投球完畢後，投手立即接受其中一種恢復處理，WBV進行振動頻率：50 Hz、40 Hz與30 Hz依序各2 min；振幅：1.5 mm之處理，EMS進行刺激頻率：9 Hz、8 Hz、7 Hz依序各2 min之處理，而CON僅安靜休息6 min，在每一局恢復處理前後皆收集參與者之HR、RPE與BLa等數據。結果顯示WBV與EMS的平均球速皆顯著優於CON，且WBV之平均球速又顯著優於EMS，此外，WBV與EMS在恢復處理後的BLa皆顯著低於CON，但是RPE則僅有WBV顯著低於CON。本研究結果指出WBV與EMS之被動肌肉收縮恢復模式皆有助於投球局間疲勞指標之降低（血乳酸濃度），但WBV對於促進投球表現較有效。
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