Author ORCID Identifier

https://orcid.org/0000-0001-5432-9133

Year of Publication

2020

Degree Name

Master of Science (MS)

Document Type

Master's Thesis

College

Education

Department

Kinesiology and Health Promotion

First Advisor

Dr. Haley Bergstrom

Abstract

This study determined if plate movement during conventional deadlifting affects critical resistance (CR) estimates derived from the linear work limit (Wlim) versus repetitions relationship. Eleven subjects completed 1-repetition maximum (1RM) deadlift testing followed by 8 visits, to determine the number of repetitions to failure at 50%, 60%, 70%, and 80% 1RM for both reset (RS) and touch-and-go (TG) methods, respectively. The CR was calculated as slope of the line of total work completed (repetitions × load [in kilograms]) versus total repetitions for each of four intensities (50-80% 1RM). The number of repetitions to failure were determined at CRRS and CRTG. The kg values andrepetitions to failure at CRRS and CRTG, as well as total repetitions at each intensity (50-80%) for each method (RS and TG) were compared using paired-samples t-tests and simple linear regression. There were no significant mean differences in kg values (mean difference = -0.4 ± 7.9 kg, p = 0.856, 95% CI = -5.8 – 4.9 kg, d = -0.028), %1RM (mean difference = -1.2% ± 5.6%, p = 0.510, 95% CI = -4.9 – 2.6%, d = -0.234), or total repetitions completed (mean difference = 2.8 ± 15.7 reps, p = 0.565, 95% CI = -7.7 – 13.4, d = 0.188) for CRRS and CRTG. There was a significant correlation between CRRS and CRTG kg resistance (r = 0.888, p < 0.001). These findings indicated that plate movement did not affect mean estimation of CR or number of repetitions completed at submaximal loads. Thus, the estimates of CR from the modeling of total work versus repetitions were relatively robust to variations in deadlifting methodologies. However, individual variability (wide range in difference scores) in kg values and repetition to failure at CRRS and CRTG indicated that deadlifting methods may differ in anatomical region of fatigue.

Digital Object Identifier (DOI)

https://doi.org/10.13023/etd.2020.071

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