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The validity and reliability of a customized rigid supportive harness during Smith machine back squat exercise.
J Strength Cond Res. 2014 Mar; 28(3):636-42.JS

Abstract

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.

Authors+Show Affiliations

1Applied Sport Science and Exercise Testing Laboratory, Faculty of Science and Information Technology, University of Newcastle, Ourimbah, Australia; 2Priority Research Center in Physical Activity and Nutrition, University of Newcastle, Callaghan, Australia; 3Biomedical Sciences and Pharmacy, Faculty of Health, University of Newcastle, Ourimbah, Australia; and 4New South Wales Institute of Sport, Sydney Olympic Park, Sydney, Australia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Validation Study

Language

eng

PubMed ID

23897023

Citation

Scott, Brendan R., et al. "The Validity and Reliability of a Customized Rigid Supportive Harness During Smith Machine Back Squat Exercise." Journal of Strength and Conditioning Research, vol. 28, no. 3, 2014, pp. 636-42.
Scott BR, Dascombe BJ, Delaney JA, et al. The validity and reliability of a customized rigid supportive harness during Smith machine back squat exercise. J Strength Cond Res. 2014;28(3):636-42.
Scott, B. R., Dascombe, B. J., Delaney, J. A., Elsworthy, N., Lockie, R. G., Sculley, D. V., & Slattery, K. M. (2014). The validity and reliability of a customized rigid supportive harness during Smith machine back squat exercise. Journal of Strength and Conditioning Research, 28(3), 636-42. https://doi.org/10.1519/JSC.0b013e3182a362df
Scott BR, et al. The Validity and Reliability of a Customized Rigid Supportive Harness During Smith Machine Back Squat Exercise. J Strength Cond Res. 2014;28(3):636-42. PubMed PMID: 23897023.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The validity and reliability of a customized rigid supportive harness during Smith machine back squat exercise. AU - Scott,Brendan R, AU - Dascombe,Ben J, AU - Delaney,Jace A, AU - Elsworthy,Nathan, AU - Lockie,Robert G, AU - Sculley,Dean V, AU - Slattery,Katie M, PY - 2013/7/31/entrez PY - 2013/7/31/pubmed PY - 2014/11/15/medline SP - 636 EP - 42 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 28 IS - 3 N2 - 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. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/23897023/The_validity_and_reliability_of_a_customized_rigid_supportive_harness_during_Smith_machine_back_squat_exercise_ L2 - https://doi.org/10.1519/JSC.0b013e3182a362df DB - PRIME DP - Unbound Medicine ER -