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Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
Sports
  • Kevin M. Carroll, East Tennessee State University
  • Kimitake Sato, East Tennessee State University
  • Caleb D. Bazyler, East Tennessee State University
  • N. Travis Triplett, Appalachian State University
  • Michael H. Stone, East Tennessee State University
Document Type
Article
Publication Date
7-14-2017
Description

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.

Copyright Statement

© 2017 by the authors. This document was originally published in Sports.

Creative Commons License
Creative Commons Attribution 4.0
Citation Information
Kevin M. Carroll, Kimitake Sato, Caleb D. Bazyler, N. Travis Triplett, et al.. "Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test" Sports Vol. 5 Iss. 3 (2017) p. 51 ISSN: 2075-4663
Available at: http://works.bepress.com/caleb-bazyler/10/