All ETDs from UAB

Advisory Committee Chair

Harshvardhan Singh

Document Type


Date of Award


Degree Name by School

Master of Science (MS) College of Arts and Sciences


Resistive squat exercise is a well-established technique to enhance the strength of muscles and bone of the back in humans. Such type of exercise could prove highly beneficial for individuals with pathological condition of the back such as osteoporosis. Notably, the rehabilitation programs aimed at strengthening the muscles and bone of the back require the knowledge of the patient’s one repetition maximum (1RM). Finding the 1RM squat value could lead to injury due to the higher weights involved. In addition, testing for 1RM could be not feasible in older populations or young population with chronic back conditions The isometric squat serves as the safest squat type in terms of injury due to the nature of the muscular activity that takes place versus the concentric and eccentric squat types. My study sought to investigate the predictive relationship between the maximum isometric squat strength and the maximum concentric and eccentric squat strength in young and older individuals. In addition, I also examined the predictive ability of prone back extension exercise to predict the concentric and eccentric 1RMS in young and older adults. Individuals from two age populations, 21-35 years (young) and 55-75 years (older), were recruited and participated in two visits within a two-week period. The study found that the maximum isometric squat was a significant predictor of the concentric (p < 0.05, NormalizedConMax=.708 + 1.376(NormalizedIsoMax)) and eccentric 1RM squat maximums (p < 0.05, NormalizedEccMax= .844+1.433(NormalizedIsoMax)) in older adults only. Prone back extension repetitions a participant was found to be a significant predictor of the eccentric squat 1RM in older adults (p<0.05; NormalizedEccMax =0.714 + 0.030(PBERM)) and a significant predictor of the concentric squat 1RM in younger adults (p < 0.05, NormalizedConMax=0.448 +0.054(PBERM)). Study findings and the novel equations provide data to predict the 1RM concentric and eccentric squat values necessary for designing the rehabilitation regimes for enhancing musculoskeletal status of the back in humans.



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