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Understanding the Key Phases of the Countermovement Jump Force-Time Curve

McMahon, John J., PhD, CSCS*D1; Suchomel, Timothy J., PhD, CSCS*D2; Lake, Jason P., PhD3; Comfort, Paul, PhD, CSCS*D1

Strength & Conditioning Journal: August 2018 - Volume 40 - Issue 4 - p 96–106
doi: 10.1519/SSC.0000000000000375
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ABSTRACT THE COUNTERMOVEMENT JUMP (CMJ) TEST IS COMMONLY CONDUCTED TO ASSESS NEUROMUSCULAR FUNCTION AND IS BEING INCREASINGLY PERFORMED USING FORCE PLATFORMS. COMPREHENSIVE INSIGHT INTO ATHLETES' NEUROMUSCULAR FUNCTION CAN BE GAINED THROUGH DETAILED ANALYSES OF FORCE-TIME CURVES THROUGHOUT SPECIFIC PHASES OF THE CMJ, BEYOND JUMP HEIGHT ALONE. CONFUSINGLY, HOWEVER, MANY DIFFERENT TERMS AND METHODS HAVE BEEN USED TO DESCRIBE THE DIFFERENT PHASES OF THE CMJ. THIS ARTICLE DESCRIBES HOW 6 KEY PHASES OF THE CMJ (WEIGHING, UNWEIGHTING, BRAKING, PROPULSION, FLIGHT, AND LANDING) CAN BE DERIVED FROM FORCE-TIME RECORDS TO FACILITATE RESEARCHERS' AND PRACTITIONERS' UNDERSTANDING AND APPLICATION TO THEIR OWN PRACTICE.

1Directorate of Sport, Exercise and Physiotherapy, University of Salford, Salford, Greater Manchester, United Kingdom;

2Department of Human Movement Sciences, Carroll University, Waukesha, Wisconsin; and

3Department of Sport and Exercise Sciences, University of Chichester, Chichester, West Sussex, United Kingdom

Address correspondence to Dr. John J. McMahon, j.j.mcmahon@salford.ac.uk.

Conflicts of Interest and Source of Funding: The authors report no conflicts of interest and no source of funding.

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John J. McMahonis a lecturer in sports biomechanics and strength and conditioning in the Directorate of Sport, Exercise and Physiotherapy at the University of Salford.

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Timothy J. Suchomelis an assistant professor in the Department of Human Movement Sciences at Carroll University.

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Jason P. Lakeis a reader in sport and exercise biomechanics and program leader of the MSc Strength and Conditioning in the Department of Sport and Exercise Sciences at the University of Chichester.

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Paul Comfortis a reader in strength and conditioning and program leader of the MSc Strength and Conditioning in the Directorate of Sport, Exercise and Physiotherapy at the University of Salford.

© 2018 by the National Strength & Conditioning Association