The purpose of our study was to examine the effects of two different training methods on dynamic and isometric measures of maximal strength. Seventeen recreationally trained males (1-RM Squat: 146.9 +/- 22.4 kg) were assigned to two groups: full ROM squat (F) and full ROM with partial ROM squat (FP) for the 7-week training intervention. Repeated measures ANOVA revealed that there was a statistically significant group by time interaction for impulse scaled at 50 ms, 90 ms, and 250 ms at 90[degrees] of knee flexion and rate of force development at 200 ms with 120[degrees] of knee flexion (p<0.05). There was also a statistically significant time effect (p<0.05) for the 1-RM squat, 1-RM partial-squat, isometric squat peak force allometrically scaled (IPFa) 90[degrees], IPFa 120[degrees] and impulse allometrically scaled at 50ms, 90 ms, 200 ms, and 250 ms at 90[degrees] and 120[degrees] of knee flexion. Additionally, the FP group achieved statistically larger relative training intensities (%1-RM) during the final three weeks of training (p<0.05). There was a trend for FP to improve over F in 1-RM squat (+3.1%, d=0.53 vs. 0.32), 1-RM partial-squat (+4.7%, d=0.95 vs. 0.69), IPFa 120[degrees] (+5.7%, d=0.52 vs. 0.12), and impulse scaled at 50 ms, 90 ms, 200 ms, and 250 ms at 90[degrees] (+6.3 to 13.2%, d=0.50 to 1.01 vs. 0.30 to 0.57) and 120[degrees] (+3.4 to 16.8%, d=0.45 to 1.11 vs. 0.08 to 0.37). These larger effect sizes in the FP group can likely be explained their ability to train at larger relative training intensities during the final 3 weeks of training resulting in superior training adaptations. Our findings suggest that partial ROM squats in conjunction with full ROM squats may be an effective training method for improving maximal strength and early force-time curve characteristics in males with previous strength training experience. Practically, partial-squats may be beneficial for strength and power athletes during a strength-speed mesocycle while peaking for competition.
Copyright (C) 2014 by the National Strength & Conditioning Association.