אימונים Effects of changing from full range of motion to partial range of motion on squat kin

[Mike Bikov]

J Strength Cond Res. 2012 Jan 3. [Epub ahead of print]
Effects of changing from full range of motion to partial range of motion on squat kinetics.
Moore N, Drinkwater EJ, Bird SP.
Source

Institutional Affiliation: School of Human Movement Studies, Charles Sturt University, Panorama Avenue, Bathurst, NSW, Australia, 2795.
Abstract

It is commonplace for people involved in recreational weight training to limit squat depth in order to lift heavier loads. This study compares differences in movement kinetics when squatting in the full range of motion (FROM) versus partial range of motion (PROM). Ten males with a one-year minimum of resistance training attended four sessions each comprising four sets of squats following one of: FROM for 10 repetitions (FROM10) at an intensity of 67%1RM FROM squat, PROM for 10 repetitions (PROM10) at 67%1RM PROM squat, FROM for five repetitions (FROM5) at 83% FROM squat or PROM for five repetitions (PROM5) at 83%1RM PROM squat. Movement velocity was not specified. Squat kinetics data were collected using an optical encoder. Differences between conditions were analysed by repeated-measures ANOVA and expressed as mean differences and standardized (Cohen) effect sizes with 95% confidence limits. PROM5 was substantially more than the PROM10 (98 W, -21-217; mean, lower and upper 95% confidence limits), FROM5 (168 W, 47-289) and FROM10 (255 W, 145-365). The force produced during PROM5 was substantially more than PROM10 (372 N, 254-490), FROM5 (854 N, 731-977) and FROM10 (1069 N, 911-1227). The peak velocity produced during FROM10 was substantially more than FROM5 (0.105 m/s, 0.044-0.166), PROM10 (0.246 m/s, 0.167-0.325) and PROM5 (0.305 m/s, 0.228-0.382). FROM5 was substantially more than FROM10 (86 J, 59-113), PROM5 (142 J, 90-194), and PROM10 (211 J, 165-257). Therefore, either range of motion can have practical implications in designing resistance training programs depending on if the training goal is related to power and force development, maximising work output or speed. Moderate-load PROM training, common amongst recreational weight-trainers, is unlikely to provide higher movement kinetics.​

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