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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Fabrício E. ROSSI 1, 2, Brad J. SCHOENFELD 3, Skyler OCETNIK 1, Jonathan YOUNG 1, Andrew VIGOTSKY 4, Bret CONTRERAS 5, James W. KRIEGER 6, Michael G. MILLER 7, Jason CHOLEWA 2
1 Institute of Bioscience, Department of Physical Education University Estadual Paulista, Rio Claro, São Paulo, Brazil; 2 Department of Kinesiology, Recreation and Sport Studies, Coastal Carolina University, Conway, SC, USA; 3 Department of Health Sciences, CUNY Lehman College, Bronx, NY, USA; 4 Kinesiology Program, Arizona State University , Phoenix, AZ, USA; 5 Sport Performance Research Institute, AUT University, Auckland, New Zeland; 6 Weightology, LLC, Issaquah, WA, USA; 7 Department of Human Performance and Health Education, Western Michigan University, Kalamazoo, MI, USA
BACKGROUND: The purpose of this study was to compare strength, body composition, and functional outcome measures following performance of the back squat, leg press, or a combination of the two exercises.
METHODS: Subjects were pair-matched based on initial strength levels and then randomly assigned to 1 of 3 groups: A squat-only group (SQ) that solely performed squats for the lower body; a leg press-only group (LP) that solely performed leg presses for the lower body, or; a combined squat and leg press group (SQ-LP) that performed both squats and leg presses for the lower body. All other RT variables were held constant. The study period lasted 10 weeks with subjects performing 2 lower body workouts per week comprising 6 sets per session at loads corresponding to 8-12 RM with 90 to 120 second rest intervals.
RESULTS: Results showed that SQ had greater transfer to maximal squat strength compared to the leg press. Effect sizes favored SQ and SQ-LP versus LP with respect to countermovement jump while greater effect sizes for dynamic balance were noted for SQ-LP and LP compared to SQ, although no statistical differences were noted between conditions.
CONCLUSIONS: These findings suggest that both free weights and machines can improve functional outcomes, and that the extent of transfer may be specific to the given task.