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Acute effects of a vibration-like stimulus during knee extension exercise.

Abstract：

PURPOSE:This study was conducted to test whether a low-frequency vibration-like stimulus (rapid variable resistance) applied during a single session of knee extension exercise would alter muscle performance. METHODS:Torque, knee joint angle, EMG activity of rectus femoris (RF) and vastus lateralis (VL) muscles, and VL muscle oxygenation status (near-infrared spectroscopy) were recorded during metronome-guided knee extension exercise. Nine healthy adults completed four trials exercising at contraction intensities of 35% (L) or 70% (H) of one-repetition maximum (1RM) in control (no vibration, Vb-) or vibrated condition (superimposed 10-Hz vibration-like stimulus, Vb+). Maximum voluntary contraction and 1RM were tested pre- and postexercise. RESULTS:During 1RM tests, muscle dynamic strength (P=0.02) and power (P=0.05) were significantly higher during vibrated rather than nonvibrated trials, and strength was significantly higher post- than preexercise (P=0.002), except during LVb- trial. Median spectral frequency of VL and RF EMG activity was significantly higher during postexercise than preexercise 1RM test in the vibration trials but unchanged in the control trials (P<0.02). The rate of muscle deoxygenation was 58% faster during H than L exercise (P=0.001), and vibration superimposition tended to speed muscle deoxygenation rate (P=0.065, 36% effect size) particularly during L trials. CONCLUSION:Vibration superimposition during knee extension exercise at low contraction intensity enhanced muscle performance. This effect appears to result from adaptation of neural factors such as motor unit excitability (recruitment and firing frequency, conduction velocity of excitation) in response to sensory receptor stimulation. Muscle vibration may increase the training effects derived from light-to-moderate exercise.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Mileva KN,Naleem AA,Biswas SK,Marwood S,Bowtell JL

doi

10.1249/01.mss.0000227318.39094.b6

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

1317-28

issue

7

eissn

0195-9131

issn

1530-0315

pii

00005768-200607000-00017

journal_volume

38

pub_type

杂志文章

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