title: The acute effects of heavy loads on jump squat performance: an evaluation of the complex and contrast methods of power development.
abstract: The purpose of this investigation was to examine power performance in jump squats when using the complex and contrast training methods. Eleven (n = 11) women participated in a familiarization session and in three randomly ordered testing sessions. One session involved completing sets of power exercises (jump squats) before sets of half squats (traditional method). The second session involved sets of half squats before sets of jump squats (complex method). A third session involved the alternation of sets of half squats and jump squats (contrast method). No significant difference in jump squat performance between each of the training methods was found. There was a significant difference (p < 0.05) in the first set of each session, with the complex method having a significantly lower peak power. Further, there was a significant difference (p < 0.05) in performance changes between the higher and lower strength groups, with the higher strength group having a greater improvement in performance using the contrast training method compared with the traditional method. It was concluded that contrast training is advantageous for increasing power output but only for athletes with relatively high strength levels.
authors.affiliation: School of Human Movement and Sports Science, University of Ballarat, Mt. Helen, Australia 3350. grant.duthie@ausport.gov.au
authors.forename: Grant M
authors.initials: GM
authors.lastname: Duthie
authors.forename: Warren B
authors.initials: WB
authors.lastname: Young
authors.forename: David A
authors.initials: DA
authors.lastname: Aitken
mesh_terms: D000704:Analysis of Variance; D015331:Cohort Studies; D005069:Evaluation Studies as Topic; D015444:Exercise / Q000502:physiology; D005260:Female; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology*; D010806:Physical Education and Training / Q000379:methods*; D010807:Physical Endurance / Q000502:physiology*; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D014891:Weight Lifting / Q000502:physiology*