Acute effects of loaded whole body vibration schemes on countermovement jump, speed and agility

The purpose of this study was to compare the effects of loaded whole body static squat exercise during whole body vibration and non vibration schemes on countermovement jump (CMJ), speed and agility. Twenty one healthy male college football players (age: 20.14 ± 1.65 years; body height: 179.9 ± 8.34 cm; body mass: 74.4 ± 13.0 kg; % body fat: 9.45 ± 4.8) participated in the study. They underwent a standardized general warm up and dynamic stretching followed by randomized loaded protocols executed for 5 minutes with a rest interval of 30 seconds. These included static squat with 30% bodyweight external load (ST + 30%), ST + 30% on a vibration platform at 25 Hz and 2 mm (WBV25), and ST + 30% on a vibration platform at 50 Hz and 4mm. Measurement of CMJ, 15 m s print and modified agility tests followed the warm up protocol. One way repeated measures ANOVA revealed a significant difference on CMJ performance, F(2,40) = 24.5, partial η = .551, p < 0.01. Bonferonni post hoc showed that ST+30% posted significantly lower CMJ than WBV25 and WBV50. CMJ at WBV50 was higher than WBV25. There was a significant difference on speed, F (2, 40) = 23.6, partial η2 = .542, p < 0.01. Post hoc determined that ST+30% was significantly slower than WBV25 and WBV50. WBV50 was faster than WBV25. There was a significant difference in the agility among interventions, F (2, 40) = 18.2, partial η2 = .477, p < 0.01. ST+30% agility time was significantly higher compared to WBV25 and WBV50. In conclusion, WBV50 posted the greatest benefits in CMJ, speed and agility.