1.2 Effects of quadriceps strength after static and dynamic whole-body vibration exercise

Journal: Journal of Strength and Conditioning Research, 2015, 29(5): 1367-1377

Study Context: Some studies have indicated that performing dynamic as compared with static position exercises while exposed to Whole Body Vibration might be beneficial but more evidence is required. This study looked at whether there would be any muscular strength or performance changes after a single bout of vibration exercise. Twenty one young men and women participated in 4 exercise protocols: two exercise regimens done with vibration and two without. 5 sets of 10 dynamic squats without vibration; 5 sets of 30 second static squat without vibration; 5 sets of 10 dynamic squats with 30 Hz WBV for a total of 2.5 minutes; and 5 sets of 30 second static squats with 30 HZ WBV for a total of 2.5 minutes.

The results of this interesting study showed that after exercise on a non-vibrating platform, strength was significantly decreased, whereas after performing squats on the vibrating platform, strength actually increased significantly (p = .003)

This strength gain was not observed after the isometric or static squat exercise on the vibration platform, presumably because the lack of change in muscle length meant very little stretch reflex activation.

Comments: This was the first study to compare two different types of exercise (static versus dynamic) under two different conditions (vibration or none) for effects following a single bout of exercise. Researchers were unable to say why the strength improved after the single bout of dynamic squats when usually neuromuscular responses take 1 to 4 weeks to occur. They theorize that the stretch reflex activation led to increased muscle recruitment such that a supramaximal level of strength was provoked.