Fast Unilateral Isometric Knee Extension Torque Development and Bilateral Jump Height

Abstract

One-legged TTI-40 to a large extent explained the variation in jump height. The ability to produce a high efferent neural drive before muscle contraction seemed to dominate performance in both the simple single-joint isometric task and the complex multijoint dynamic task.

Determinants of countermovement jump performance: a kinetic and kinematic analysis

“…Previous studies have used correlation coefficients rather than stepwise regressions to assess the rate of torque development-jump height relationship and so were not affected by this issue (De Ruiter et al, 2006;Marcora & Miller, 2000;McLellan et al, 2011;Thompson et al, 2013;Tillin et al, 2013). These assertions are further supported by a significant correlation between peak isometric torque and RTD 100-150 (r = 0.546; P = 0.01) in the present study.…”

“…The lack of significant finding relating to the initial, neutrally-mediated isometric RTD 0-50 is in agreement with Tillin et al (2013) but not De Ruiter et al (2006. It seems likely that the countermovement phase of the jump diminishes the importance of fast neural activation by enabling the development of an active state prior to the onset of concentric muscle contraction and thus increasing the time available to activate the musculature and to generate extension joint torques (Bobbert et al, 1996;Bobbert & Casius, 2005).…”

“…However, further research is needed to explain quantitatively the relative contributions of kinetic and kinematic variables to this movement. Of the kinetic determinants, greater rate of force or torque development has frequently been associated with increased CMJ performance (De Ruiter, van Leeuwen, Heijblom, Bobbert, & De Haan, 2006;Marcora & Miller, 2000;McLellan, Lovell, & Gass, 2011;Thompson et al, 2013). Both rate of force development and rate of torque development measure the capabilities of skeletal muscle to rapidly generate muscle forces and for the purposes of the present study will be referred to as rate of torque development.…”

Six weeks of knee extensor isometric training improves soccer related skills in female soccer players

“…17 Knee extensor electromyography during the first 100ms of the rise in ground reaction force is associated with jump height. 18 This suggests a relationship between the force applied in a jumping movement with knee extension. Indeed, our results suggest improving isometric knee extension strength, even without specific movement training of the stretch-shortening cycle (i.e.…”

Evaluation of Consecutive Maximum Contractions as a Test of Neuromuscular Function

“…For example, both the duration of rapid pointing movements and the time allotted to prevent a fall may be within 200 ms, or less (Kukolj et al 1999;van den Bogert et al 2002;Domkin et al 2005). The muscle activation in such movements is characterized by high instantaneous discharge rates that decline during successive firing (Desmedt and Godaux 1977;Van Cutsem et al 1998) and, therefore, the force exertion depends greatly on neural activation of the muscle fibers at the start of contraction (de Ruiter et al 2004;de Ruiter et al 2006). For contractions that produce a gradual increase in muscle force until the maximum is reached (such as in SST), there is a progressive increase in discharge rate (Enoka and Fuglevand 2001).…”