title: Short-term effects of selected exercise and load in contrast training on vertical jump performance.
abstract: 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.
authors.affiliation: Department of Physical Education and Sport Science, Democritus University of Thrace, Komotini, Greece.
authors.forename: Ilias
authors.initials: I
authors.lastname: Smilios
authors.forename: Theophilos
authors.initials: T
authors.lastname: Pilianidis
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Sotiropoulos
authors.forename: Manolis
authors.initials: M
authors.lastname: Antonakis
authors.forename: Savvas P
authors.initials: SP
authors.lastname: Tokmakidis
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D010806:Physical Education and Training / Q000379:methods*; D016474:Weight-Bearing / Q000502:physiology*