Acute Effects of Squat Position and Whole-body Vibration Frequencies on Muscular Function and Jump Performance

Authors

Jonathan Tyler Gonzalez, University of Texas Rio Grande Valley
Imtiaz Masfique Dowllah, University of Texas Rio Grande ValleyFollow
Nancy Calle, University of Texas Rio Grande Valley
Gualberto Garza IV, University of Texas Rio Grande Valley
Galilea Chapa, University of Texas Rio Grande Valley
Julissa Perez, University of Texas Rio Grande Valley
Jose M. Sosa, University of Texas Rio Grande Valley
Liana Chee, University of Texas Rio Grande Valley
Ulku Karabulut, University of Texas Rio Grande Valley
Murat Karabulut, University of Texas Rio Grande ValleyFollow

Abstract

PURPOSE: To determine the acute effects of different whole-body vibration (WBV) frequencies and squat depths on lower extremity isometric and isokinetic muscle function and vertical jump performance. METHODS: Thirteen healthy male (age = 23.8 ± 5.3 years) and fifteen healthy female subjects (age = 22.45 ± 3.04 years) performed six randomized sessions of vibration protocols (VPs) in different squat positions with 90° (low-squat) and 140° (high-squat) knee flexion angle at 30 Hz (30Hz90°; 30Hz140°), 40 Hz (40Hz90°; 40Hz140°) & 50 Hz (50Hz90°; 50Hz140°). Each subject performed 5 sets x 1-min of static squats with 30-sec rest between each set. Then they rested for 5-min and repeated 5 more sets. Once completed, vertical jump performance was measured. Furthermore, subjects were tested for maximum 5-sec right knee extensor isometric contractions at 60° of knee flexion, and isokinetic concentric knee extension and flexion at 180°/sec, utilizing standard Biodex protocol. All VPs were performed on the same commercial side to side alternating vibration platform and foot placement for all squats was recorded to ensure consistency. RESULTS: Two-way repeated measures ANOVA indicated a significant condition main effect in average jump height (pCONCLUSION: The findings are suggestive of greater muscular strength and explosive power production following a high-squat WBV warm-up compared to low-squat WBV warm-up. This can be attributed to augmented muscle fatigue and/or increased muscle length due to the plasticity of skeletal muscle while performing low-squat WBV warm-up, resulting in impaired ability to produce muscular force.

Recommended Citation

Gonzalez, Jonathan Tyler; Dowllah, Imtiaz Masfique; Calle, Nancy; Garza, Gualberto IV; Chapa, Galilea; Perez, Julissa; Sosa, Jose M.; Chee, Liana; Karabulut, Ulku; and Karabulut, Murat (2020) "Acute Effects of Squat Position and Whole-body Vibration Frequencies on Muscular Function and Jump Performance," International Journal of Exercise Science: Conference Proceedings: Vol. 2: Iss. 12, Article 82.
Available at: https://digitalcommons.wku.edu/ijesab/vol2/iss12/82