Kinetic and Electromyographic Subphase Characteristics With Relation to Countermovement Vertical Jump Performance

Journal of Applied Biomechanics
John R HarryJanet S Dufek

Abstract

This study sought to identify kinetic and electromyographic subphase characteristics distinguishing good from poor jumpers during countermovement vertical jumps (CMVJs), as defined by the reactive strength index (RSI, CMVJ displacement divided by jump time; cutoff = 0.46 m·s-1). A total of 15 men (1.8 [0.6] m, 84.5 [8.5] kg, 24 [2] y) were stratified by RSI into good (n = 6; RSI = 0.57 [0.07] m·s-1) and poor (n = 9; RSI = 0.39 [0.06] m·s-1) performance groups. The following variables were compared between groups using independent t tests (α = .05) and Cohen's d effect sizes (d ≥ 0.8, large): jump height, propulsive impulse, eccentric rate of force development, and jump time, unloading, eccentric, and concentric subphase times, and average electromyographic amplitudes of 8 lower extremity muscles. Compared with the poor RSI group, the good RSI group exhibited a greater, though not statistically different CMVJ displacement (d = 1.07, P = .06). In addition, the good RSI group exhibited a significantly greater propulsive impulse (P = .04, d = 1.27) and a significantly more rapid unloading subphase (P = .04, d = 1.08). No other significant or noteworthy differences were detected. Enhanced RSI appears related to a quicker unloading p...Continue Reading

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Citations

Jun 13, 2019·International Journal of Sports Physiology and Performance·Jeffrey D SimpsonAdam C Knight
Nov 7, 2019·Medicine and Science in Sports and Exercise·John R HarryMax R Paquette
Jul 7, 2018·Journal of Strength and Conditioning Research·Ross E SmithLawrence W Weiss
Aug 14, 2020·Journal of Sports Sciences·Luke D ChowningJohn R Harry
Jan 31, 2019·Sports·Wendi WeimarJay Patel
Nov 3, 2020·European Journal of Sport Science·Alejandro Pérez-CastillaAmador García-Ramos
Apr 18, 2021·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Juan BausJames Yang
Jul 10, 2021·Journal of Applied Biomechanics·John R HarryKristof Kipp
Sep 2, 2021·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Juan BausJames Yang

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