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單次震動式膝伸展阻力運動對血壓及脈波傳導速度之影響

Effects of Acute Knee Extensor Resistance Exercise with Vibration on Blood Pressure and Pulse Wave Velocity

摘要


本研究目的為比較震動式伸膝運動與傳統式伸膝運動對血壓以及脈波傳導速度(pulse wave velocity, PWV)的影響。以20名健康男性為受試對象,每位受試者先在伸膝器上進行最大自主等長收縮(maximum voluntary isometric contraction, MVIC)伸膝運動測驗,爾後所有受試者均進行震動式伸膝運動測驗與傳統式伸膝運動測驗。兩種伸膝運動皆進行三階測驗,第一、二階分別以40%MVIC進行8次伸膝運動,第三階以40%MVIC運動至衰竭。各階間隔1分鐘,並分別於運動前、運動間以及運動後10分鐘測量血壓及心跳率,而在運動前、後10分鐘測量PWV,運動後10分鐘檢測RPE。兩種伸膝運動測驗間隔至少48小時。研究結果發現兩種伸膝運動測驗的心跳率及血壓相似,除了脈壓於第一階運動時未顯著高於安靜值,其餘數據於運動期間皆顯著高於安靜值(p < .05),但兩運動測驗間無顯著差異。震動式伸膝運動測驗後中心脈波傳導速度IT-PWV(index finger-to-toe pulse wave velocity)顯著低於安靜值(p < .05),而震動式伸膝運動後IT-PWV變化的百分比率也顯著低於安靜值(p < .05)。本研究證實震動處理介入膝伸展運動可降低單次阻力運動後中心脈波傳導速度,但無法降低血壓的上升。

並列摘要


The purpose of this study was to compare the influence with blood pressure (BP) and pulse wave velocity (PWV) on knee extension without (KE) and with concurrent vibration (VKE).Twenty healthy male participated in this study. Each subject performed a maximum voluntary isometric contraction (MVIC) test on the knee extension machine, and then, all subjects performed the VKE and KE session by a randomized order. In each session, subjects were instructed to perform 3 sets, including 8 reps on 40% MVIC in the first 2 sets followed by exercise to exhaustion on 40% MVIC in the 3rd set with 1 minute inter-set rest. We measured BP, heart rate before exercise, during exercise and 10 minutes after exercise. PWV was also measured before and after exercise. Sessions were performed at least 48 hours apart. In this study, there was a similar trend on heart rate and BP changes in both exercise sessions. The changes of measured variables during and after exercise were significantly higher than the baseline (p < .05), except the pulse pressure after the 1st set. There was no difference between exercise sessions on measured variables before, during, and after exercise. Both absolute and relative changes of index finger-to-toe pulse wave velocity (IT-PWV) after the vibration knee extension exercise were significantly lower than the baseline (p < .05). In conclusion, knee extension exercise with concurrent vibration could attenuate the increase in pulse wave velocity induced by acute knee extension exercise independent of blood pressure changes.

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