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The validity and reliability of a customized rigid supportive harness during smith machine back squat exercise

journal contribution
posted on 20.08.2019, 00:00 by BR Scott, BJ Dascombe, JA Delaney, Nathan Elsworthy, RG Lockie, DV Sculley, KM Slattery
The validity and reliability of a customized rigid supportive harness during Smith machine back squat exercise. J Strength Cond Res 28(3): 636-642, 2014- Although the back squat exercise is commonly prescribed to both athletic and clinical populations, individuals with restricted glenohumeral mobility may be unable to safely support the bar on the upper trapezius using their hands. The aims of this study were to investigate the validity and reliability of a back squat variation using a rigid supportive harness that does not require unrestricted glenohumeral mobility for quantifying 1 repetition maximum (1RM). Thirteen young men (age = 25.3 ± 4.5 years, height = 179.2 ± 6.9 cm, and body mass = 86.6 ± 12.0 kg) with at least 2 years resistance training experience volunteered to participate in the study. Subjects reported to the lab on 3 occasions, each separated by 1 week. During testing sessions, subjects were assessed for 1RM using the traditional back squat (session 1) and harness back squat (HBS; sessions 2 and 3) exercises. Mean 1RM for the traditional back squat, and 2 testing sessions of the HBS (HBS1 and HBS2) were 148.4 ± 25.0 kg, 152.5 ± 25.7 kg, and 150.4 ± 22.6 kg, respectively. Back squat and mean HBS 1RM scores were very strongly correlated (r = 0.96; p ≥ 0.001). There were no significant differences in 1RM scores between the 3 trials. The test-retest 1RM scores with the HBS demonstrated high reliability, with an intraclass correlation coefficient of 0.98 (95% confidence interval [CI] = 0.93-0.99), and a coefficient of variation of 2.6% (95% CI = 1.9-4.3). Taken together, these data suggest that the HBS exercise is a valid and reliable method for assessing 1RM in young men with previous resistance training experience and may be useful for individuals with restricted glenohumeral mobility. © 2014 National Strength and Conditioning Association. Scott, BR, Dascombe, BJ, Delaney, JA, Elsworthy, N, Lockie, RG, Sculley, DV, and Slattery, KM.

History

Volume

28

Issue

3

Start Page

636

End Page

642

Number of Pages

7

eISSN

1533-4287

ISSN

1064-8011

Publisher

Lippincott Williams & Wilkins, USA

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

New South Wales Institute of Sport; University of Newcastle

Era Eligible

Yes

Journal

Journal of Strength and Conditioning Research

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