Reliability of Gallon-Jug Shelf-Transfer Power Equations in Older Women

• Published in: Journal of strength and conditioning research 2023-05, Vol.37 (5), p.1124-1130
• Main Authors: Ly, Anna, Strand, Keri L., Courtney, Kylie J., Barry, Sarah S., Parrino, Rosalia L., Liscano, Jose A., Trebotich, Thomas L., Martin-Diala, Chimaobim, Martin, Erick, Signorile, Joseph F.
• Format: Article
• Language: English
• Subjects: Aged; Female; Health Status; Humans; Reproducibility of Results; Statistical analysis; Statistics
• ISSN: 1064-8011; 1533-4287
• DOI: 10.1519/JSC.0000000000004364

Ly, A, Strand, KL, Courtney, KJ, Barry, SS, Liscano, JA, Trebotich, TL, Martin-Diala, C, Martin, E, and Signorile, JF. Reliability of gallon-jug shelf-transfer test power equations in older women. J Strength Cond Res 37(5): 1124-1130, 2023-This study examined the test-retest reliability of the gallon-jug shelf-transfer (GJST) test as a measure of upper-body functional power in older women. Although the validity of the predictive equations for power during the GJST test has been established, for the test to be viable in either a laboratory or clinical environment, between-day and within-day reliability must be established. Thirty-four independently living older women (mean ± SD : 75.0 ± 6.4 years) performed 2 sets of 3 repetitions of the GJST test on 2 days separated by at least 48 hours. Using the established predictive equations, the values for peak power and average power were then computed. Statistical analyses to assess reliability included intraclass correlation coefficient, coefficient of variation (CV), SEM , minimal detectable change (MDC), and Cronbach's α values. Furthermore, Bland-Altman plots evaluated the agreement between the tests. Intraclass correlation coefficient (>0.91, p < 0 001), CV (