Effect of instability and resistance on unintentional squat lifting kinetics

Drinkwater, Eric J., Pritchett, Erica J. and Behm, David G. 2007, Effect of instability and resistance on unintentional squat lifting kinetics, International journal of sports physiology and performance, vol. 2, no. 4, pp. 400-413.

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Title Effect of instability and resistance on unintentional squat lifting kinetics
Author(s) Drinkwater, Eric J.ORCID iD for Drinkwater, Eric J. orcid.org/0000-0002-9594-9360
Pritchett, Erica J.
Behm, David G.
Journal name International journal of sports physiology and performance
Volume number 2
Issue number 4
Start page 400
End page 413
Total pages 14
Publisher Human Kinetics
Place of publication Champaign, Ill.
Publication date 2007
ISSN 1555-0273
Keyword(s) resistance training
stability training
optical encoder
core stability
Summary Context: Resistance training while using an instability-training device is known to increase activation of stabilizing muscle groups while decreasing the force generated by the prime movers during isometric contractions. Purpose: To investigate differences in squat kinetics during dynamic resistance training in an increasingly unstable training environment. Methods: Fourteen active men participated in this study. In each testing session, each participant performed 3 repetitions of squats with a 10-repetition maximum (10-RM) resistance, 40% of their 10-RM resistance, and 20.45 kg. The 3 testing session consisted of standing on a stable floor, foam pads, or BOSU balls. All repetitions were recorded with an optical encoder to record barbell kinetics. Results: The transition from stable (floor) to very unstable (BOSU) resulted in high likelihoods (>75%) of clinically meaningful differences ranging from small to large (effect size [ES] 0.31–1.73) in factors relating to concentric kinetics, eccentric power, and squat depth, regardless of the resistance used for training. There were also likely differences at the heaviest resistance in peak concentric power (stable to foam: ES 2.06; foam to BOSU: ES 0.38), eccentric power (stable to foam: ES 1.88; foam to BOSU: ES 0.74), and squat depth (stable to foam: ES 0.50; foam to BOSU: ES 0.67). Conclusions: Resistance training in an unstable environment at an intensity sufficient to elicit strength gains of the prime movers results in deleterious effects in concentric squat kinetics and squat technique. Such observations are particularly evident on very unstable platforms.
Language eng
Field of Research 1106 Human Movement And Sports Science
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Human Kinetics
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083146

Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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