Abstract
The purpose of the current study was two-fold: (1) To examine the variation in velocity and power with increasing intensity in the back squat among subjects; and (2) To explore individual subject characteristics as possible explanations for variations of velocity in the back squat. Fourteen recreationally trained male subjects with experience in the back squat agreed to participate in the study (age = 25.0 ± 2.6 years, height = 178.9 ± 8.1 cm, body mass = 88.2 ± 15.8 kg). One-repetition maximums (1RM) were performed for each subject on force platforms with four linear position transducers attached to the barbell. The 1RM assessment was immediately preceded by warm-up sets at 65%, 75%, 85%, and 95% of estimated 1RM for 5, 3, 2, and 1 repetitions, respectively. Mean concentric velocity (MCV) and mean power were recorded for each intensity condition and were analyzed using Pearson correlation to determine the relationship between each variable and relative intensity (%1RM). Statistically significant negative relationships existed between %1RM and MCV (r = −0.892) and mean power (r = −0.604). Between-subject coefficient of variation tended to increase as %1RM increased for both MCV and mean power. These results suggest that MCV is superior to mean power as an indicator of relative intensity in the back squat. Additionally, the between-subject variation observed at higher intensities for MCV and mean power support the use of velocity ranges by strength and conditioning coaches.
Highlights
Velocity-Based Training (VBT) has recently gained popularity in research and practice [1,2,3,4,5].VBT is a training strategy emphasizing movement velocity for exercise testing and prescription of load in resistance training [6]
The current study examined the relationship of Mean concentric velocity (MCV) and mean power with increasing relative intensity in a graded back squat test
A strong relationship exists between both MCV and mean power with %1RM, the increasing variation with increasing intensity suggests that further discussion of the practical efficacy of the protocol is warranted
Summary
Velocity-Based Training (VBT) has recently gained popularity in research and practice [1,2,3,4,5].VBT is a training strategy emphasizing movement ( barbell) velocity for exercise testing and prescription of load in resistance training [6]. Velocity-Based Training (VBT) has recently gained popularity in research and practice [1,2,3,4,5]. Some have suggested fitness qualities (e.g., strength or explosiveness) may be enhanced based on manipulation of barbell velocities during resistance training [1,7]. Barbell velocities may have a significant impact on the resultant power output of an exercise. This has important implications for performance enhancement, as power output is regarded as a vital factor in performance [8,9], especially for strength-power athletes [10]. There is a paucity of research examining both velocity and power output data in the context of VBT application
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