Offset Loading in a Bilateral Squatting Movement Pattern Influences Ground-Reaction Force and Muscle Activity in the Dominant and Nondominant Limb
- 1 May 2023
- journal article
- research article
- Published by Human Kinetics in International Journal of Sports Physiology and Performance
- Vol. 18 (5), 523-529
- https://doi.org/10.1123/ijspp.2022-0407
Abstract
Purpose: The purpose of this study was to explore whether offset loading in the barbell squat altered ground-reaction force (GRF) and muscle activation in the dominant (D) and nondominant (ND) lower limb compared to traditional squats. Methods: Twelve well-trained men (age 26.4 [3.2] y; 10.3 [1.9] y experience) performed 3 sets of 10 repetitions at 60% of their previously measured 1-repetition maximum. Sets were quasi-randomized between traditional loading (TDL), dominant-side offset loading (OS-D), and nondominant-side offset loading (OS-ND). All repetitions were performed on a dual force plate with electromyography sensors on the prime mover muscles of the squat. GRF symmetry was assessed using the symmetry index (SI) to determine the direction (D [+] or ND [−]) and magnitude (%) of the asymmetry. Finally, the first 3 and final 3 repetitions of each set were compared for compensatory changes in symmetry. Results: OS-D induced a significant change in limb SI relative to TDL (5.21% vs 1.44%; P = .011); however, no significant difference in limb SI was seen between TDL and OS-ND (−0.66% vs 1.44%; P = .278). No asymmetries between D and ND muscle activation were present in any condition. TDL and OS-D squats exhibited significant improvements in limb SI between the first 3 and final 3 repetitions (P = .035 and .011, respectively); however, no such improvement was seen in OS-ND. Conclusions: OS-D is capable of significantly altering GRF limb SI in a bilateral squat; however, OS-ND appears to exhibit no GRF or electromyography effects relative to TDL. Thus, the results of this study do not support the use of OS-ND in the pursuit of strengthening a weaker limb, suggesting that unilateral training may be a preferred mode of exercise for this desired outcome.Keywords
This publication has 18 references indexed in Scilit:
- The effect of limb dominance on lower limb functional performance – a systematic reviewJournal of Sports Sciences, 2015
- Eccentric Hamstring Strength and Hamstring Injury Risk in Australian FootballersMedicine & Science in Sports & Exercise, 2015
- Functional plasticity of sensorimotor representations following short-term immobilization of the dominant versus non-dominant handsActa Psychologica, 2015
- Task, muscle and frequency dependent vestibular control of postureFrontiers in Integrative Neuroscience, 2015
- Motor control strategies during double leg squat following anterior cruciate ligament rupture and reconstruction: an observational studyJournal of NeuroEngineering and Rehabilitation, 2014
- Comparison of ground reaction force during different angle of squattingJournal of Human Sport and Exercise, 2013
- Effects of Fatigue on Bilateral Ground Reaction Force Asymmetries during the Squat ExerciseJournal of Strength and Conditioning Research, 2011
- The prehistory of handedness: Archaeological data and comparative ethologyJournal of Human Evolution, 2009
- Frequency response of human vestibular reflexes characterized by stochastic stimuliJournal Of Physiology-London, 2007
- The manifestation of infant hand‐use preferences when reaching for objects during the seven‐ to thirteen‐month age periodDevelopmental Psychobiology, 2006