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A Biomechanical Comparison Of The Traditional Squat, Powerlifting Squat, And Box Squat, Paul Swinton, Ray Lloyd, Justin Keogh, Ioannis Agouris, Arthur Stewart
A Biomechanical Comparison Of The Traditional Squat, Powerlifting Squat, And Box Squat, Paul Swinton, Ray Lloyd, Justin Keogh, Ioannis Agouris, Arthur Stewart
Justin Keogh
Swinton, PA, Lloyd, R, Keogh, JWL, Agouris, I, and Stewart, AD. A biomechanical comparison of the traditional squat, powerlifting squat, and box squat. J Strength Cond Res 26(7): 1805–1816, 2012. The purpose of this study was to compare the biomechanics of the traditional squat with 2 popular exercise variations commonly referred to as the powerlifting squat and box squat. Twelve male powerlifters performed the exercises with 30, 50, and 70% of their measured 1 repetition maximum (1RM), with instruction to lift the loads as fast as possible. Inverse dynamics and spatial tracking of the external resistance were used to quantify …
A Kinematic Analysis Of A Strongman-Type Event: The Heavy Sprint-Style Sled Pull, Justin Keogh, Craig Newlands, Sandra Blewett, Amenda Payne, Lin Chun-Er
A Kinematic Analysis Of A Strongman-Type Event: The Heavy Sprint-Style Sled Pull, Justin Keogh, Craig Newlands, Sandra Blewett, Amenda Payne, Lin Chun-Er
Justin Keogh
This study sought to (a) characterize the kinematics aspects of a popular strongman-type event, the heavy sprint-style sled pull, and (b) gain some insight into the kinematic factors that could distinguish the within- and between-subjects' fastest and slowest trials. Six resistance-trained subjects with experience in the heavy sled pull gave informed consent to participate in this study. Subjects performed three 25-m sets of sled pulls with a load of 171.2 kg with 3 minutes of rest between sets. Kinematic variables were obtained from 2 video cameras positioned perpendicularly 11 m from the intended direction of the sled pull. Camera 1 …
Age-Related Differences In Inter-Digit Coupling During Finger Pinching, Justin Keogh, S. Morrison, R. Barrett
Age-Related Differences In Inter-Digit Coupling During Finger Pinching, Justin Keogh, S. Morrison, R. Barrett
Justin Keogh
The present study was designed to examine the finger-pinch force control, digit force sharing and digit coupling relations of 13 young and 14 older adults. Subjects performed four isometric tri-digit finger-pinch force production conditions reflecting all combinations of mean force level (20 and 40% MVC) and target shape (constant and sinusoidal). Older adults had significantly reduced force control, as indicated by their greater levels of absolute and relative force variability and targeting error than young adults. The age-related loss of relative force control was more pronounced at low (20% MVC) than high (40% MVC) forces, and to a lesser extent, …