Skip to main content
Article
Reliability of performance velocity for jump squats under feedback and nonfeedback conditions
Journal of Strength and Conditioning Research
  • Aaron D Randell, Auckland University of Technology
  • John B Cronin, Edith Cowan University
  • Justin Keogh, Bond University
  • Nicholas D Gill, Auckland University of Technology
  • Murray C Pedersen, Bay of Plenty Rugby Union, Mount Maunganui, NZ
Date of this Version
1-1-2011
Document Type
Journal Article
Publication Details

Citation only

Randell, A.D., Cronin, J. B., Keogh, J.W.L., Gill, N.D., & Pedersen, M.C. (2011). Reliability of performance velocity for jump squats under feedback and nonfeedback conditions. Journal of Strength and Conditioning Research, 25(12), 3514-3518

Access the journal

© Copyright National Strengt and Conditioning Association, 2011

Disciplines
Abstract

Advancements in the monitoring of kinematic and kinetic variables during resistance training have resulted in the ability to continuously monitor performance and provide feedback during training. If equipment and software can provide reliable instantaneous feedback related to the variable of interest during training, it is thought that this may result in goal-oriented movement tasks that increase the likelihood of transference to on-field performance or at the very least improve the mechanical variable of interest. The purpose of this study was to determine the reliability of performance velocity for jump squats under feedback and nonfeedback conditions over 3 consecutive training sessions.

Twenty subjects were randomly allocated to a feedback or nonfeedback group, and each group performed a total of 3 “jump squat” training sessions with the velocity of each repetition measured using a linear position transducer.

There was less change in mean velocities between sessions 1–2 and sessions 2–3 (0.07 and 0.02 vs. 0.13 and −0.04 m•s−1), less random variation (TE = 0.06 and 0.06 vs. 0.10 and 0.07 m•s−1) and greater consistency (intraclass correlation coefficient = 0.83 and 0.87 vs. 0.53 and 0.74) between sessions for the feedback condition as compared to the nonfeedback condition.

It was concluded that there is approximately a 50–50 probability that the provision of feedback was beneficial to the performance in the squat jump over multiple sessions.

It is suggested that this has the potential for increasing transference to on-field performance or at the very least improving the mechanical variable of interest.

Citation Information
Aaron D Randell, John B Cronin, Justin Keogh, Nicholas D Gill, et al.. "Reliability of performance velocity for jump squats under feedback and nonfeedback conditions" Journal of Strength and Conditioning Research Vol. 25 Iss. 12 (2011) p. 3514 - 3518 ISSN: 1533-4287
Available at: http://works.bepress.com/justin_keogh/37/