SHORT-TERM EFFECTS OF SELECTED EXERCISE AND LOAD IN CONTRAST TRAINING ON VERTICAL JUMP PERFORMANCE

• Published in: Journal of strength and conditioning research 2005-02, Vol.19 (1), p.135-139
• Main Authors: SMILIOS, ILIAS, PILIANIDIS, THEOPHILOS, SOTIROPOULOS, KONSTANTINOS, ANTONAKIS, MANOLIS, TOKMAKIDIS, SAVVAS P.
• Format: Article
• Language: English
• Subjects: Adult; Exercise - physiology; Humans; Male; Muscle, Skeletal - physiology; Physical Education and Training - methods; Space life sciences; Weight-Bearing - physiology
• ISSN: 1064-8011; 1533-4287
• DOI: 10.1519/00124278-200502000-00023

The present study examined the short-term effects of loaded half squats (HSs) and loaded jump squats (JSs) with low and moderate loads on the squat jump (SJ) and the countermovement jump (CMJ) performance using a contrast training approach. Ten men (mean ± SD age, 23 ± 1.8 years) performed the HS and JS exercises twice with loads of 30% of 1 repetition maximum (1RM) (HS30% and JS30%, respectively) and 60% of 1RM (HS60% and JS60%, respectively). On each occasion, 3 sets of 5 repetitions with 3 minutes of rest were performed as fast as possible. Vertical jump performance was measured before exercise, 1 minute after each set, and at the fifth and 10th minutes of recovery. The CMJ increased significantly after the first and second set (3.9%; p < 0.05) compared with preexercise values following the JS30% protocol and 3.3% after the second and third sets of the JS60% protocol. Following the HS60% protocol, CMJ increased after the first and the second sets (3.6%; p < 0.05) compared with preexercise values, whereas SQ increased only after the first set (4.9%; p < 0.05) in this condition. These data show that contrast loading with the use of low and moderate loads can cause a short-term increase in CMJ performance. The applied loads do not seem to present different short-term effects after loaded JSs. When the classic form of dynamic HS exercise is performed, however, at least a moderate load (60% of 1RM) needs to be applied.