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KMID : 1012020200090020113
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Physical Therapy Rehabilitation Science
2020 Volume.9 No. 2 p.113 ~ p.119
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The immediate effects of local vibration on ankle plantar flexor muscle activation and peak torque in healthy adults
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Cho Min-Jo
Yoon Do-Yoo
Yoo Jae-Hyun
Yi Dong-Hyun
Kang Dae-Won
Yim Jong-Eun
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Abstract
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Objective: The vibration device is one of the most commonly used warm-up devices not only for healthy athletes but also for healthy individuals. Therefore, this study aimed to investigate the immediate effects of local vibration on ankle plantar flexor muscle activation and peak torque in healthy adults.
Design: One-group pretest-posttest design.
Methods: This was a single-group study comprising a total of 36 (16 males and 20 females) participants. The average age of the 36 participants was 22.3 years. All the participants’ concentric and eccentric peak torques of the gastrocnemius lateralis muscle were measured using an isokinetic device. Simultaneously, the participants’ muscle activity was measured by surface electromyography. After the pre-experimental data were collected, the participants comfortably sat on the prepared chair with their hips and knees flexed to 90°. While in sitting position, local vibration was applied for 10 minutes using a 1:1 ratio intermittent pulsing mode device based on a previous study. Then, the post-experimental data were collected immediately after the local vibration by performing a similar process performed during the pre-experimental data collection.
Results: The results showed a significant difference in muscle activity and eccentric peak torque (p<0.05). On the contrary, concentric peak torque values showed an insignificant difference with pre- and post-value.
Conclusions: The results of this study demonstrated that local vibration can be possibly considered as one of the effective ways to increase ankle plantar flexor muscle activity and muscle performance, specifically the eccentric peak torque, in healthy adults.
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KEYWORD
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Electromyograpy, Gastrocnemius muscle, Muscle strength, Power, Vibration
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