Abstract
The purpose of this study was to investigate the short-term effects of static stretching, with vibration given directly over Achilles tendon, on electro-myographic (EMG) responses and vertical jump (VJ) performances. Fifteen male, college athletes voluntarily participated in this study (n=15; age: 22±4 years old; body height: 181±10 cm; body mass: 74±11 kg). All stages were completed within 90 minutes for each participant. Tendon vibration bouts lasted 30 seconds at 50 Hz for each volunteer. EMG analysis for peripheral silent period, H-reflex, H-reflex threshold, T-reflex and H/M ratio were completed for each experimental phases. EMG data were obtained from the soleus muscle in response to electro stimulation on the popliteal post tibial nerve. As expected, the dynamic warm-up (DW) increased VJ performances (p=0.004). Increased VJ performances after the DW were not statistically substantiated by the EMG findings. In addition, EMG results did not indicate that either static stretching (SS) or tendon vibration combined with static stretching (TVSS) had any detrimental or facilitation effect on vertical jump performances. In conclusion, using TVSS does not seem to facilitate warm-up effects before explosive performance.
Highlights
The pre-activity warm-up is a widely accepted exercise to help prepare athletes, both physically and mentally, for maximum performance
The purpose of this study was to investigate short term performance outcomes and neurological effects of static stretching, the dynamic warm-up (DW) and tendon vibration combined with static stretching (TVSS)
The most interesting result was a significant increase of vertical jump (VJ) performance following the DW (p=0.004)
Summary
The pre-activity warm-up is a widely accepted exercise to help prepare athletes, both physically and mentally, for maximum performance. In other studies, it is suggested that static stretching included in precompetition warm-up programs should be replaced by dynamic stretching because SS might diminish muscular power production (Young and Behm, 2003; Wallmann et al, 2005) This may be based on stretching-induced force deficits due to mechanical factors such as decreases in muscle tension and neural inhibition resulted from tendon reflex (Herda et al, 2009). Another popular application aimed at enhancing performance is vibration training
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