Validity of a Simple Method for Measuring Force-Velocity-Power Profile in Countermovement Jump

Abstract

These results suggest that the simple method presented here is valid and reliable for computing CMJ force, velocity, power, and F-v profiles in athletes and could be used in practice under field conditions when body mass, push-off distance, and jump height are known.

Effectiveness of an Individualized Training Based on Force-Velocity Profiling during Jumping

“…The relative difference between actual and optimal F-v profiles for a given individual represents the magnitude and the direction of the unfavorable balance between force and velocity qualities (i.e., force-velocity imbalance, FV imb in %), which makes possible the individual determination of force or velocity deficit. The actual individual F-v profile and P max can be easily determined from a series of loaded vertical jumps (Samozino et al, 2008, 2014; Jiménez-Reyes et al, 2014, 2016; Giroux et al, 2015, 2016), while the optimal F-v profile can be computed using previously proposed equations based on a biomechanical model (Samozino et al, 2012, 2014). For a given P max , vertical jump performance has been shown to be negatively correlated to FV imb , which supports the importance of considering this individual characteristic in addition to P max when designing training programs to improve ballistic performance (Samozino et al, 2012, 2014; Morin and Samozino, 2016).…”

Jump height is a poor indicator of lower limb maximal power output: theoretical demonstration, experimental evidence and practical solutions

“…The relative influences of hPO, Pmax and Fv profile on SJ performance are summarized in the following equation, that has been validated experimentally [19,26]: In this equation, hmax is the maximal possible SJ height reached with an optimal Fv profile SFvopt. Note that these demonstrations have been initially published using SJ as the jump modality, but subsequent works by Jimenez-Reyes et al have shown that similar conclusions could be drawn for the CMJ modality [7]. A practical summary of the above-mentioned theoretical points is that the relationship between SJ or CMJ height is clearly confounded by individual anthropometrical and physiological factors inherent to each athlete tested.…”

“…This method, based on macroscopic modelling of body mass displacement and the associated mechanical external work, requires only body mass, hPO and jump height. The initial reliability and concurrent validity was tested against reference force plate measurements [8], and was confirmed in subsequent studies from other authors, including additional load conditions and application to CMJ [7,46,47]. In this method, the mean power produced during a jump was computed as:…”

“…Not to mention the use of this estimation in the context of sports performance monitoring or athlete's screening/selection process. By adding experimental data to illustrate our point, we have measured SJ or CMJ height and Pmax values in trained populations (sprint, weightlifting and elite rugby league competitors) within various published and in-review research protocols [7,31]. Both jump height and Pmax were assessed using a force plate system, and Pmax was determined as the apex of the load-power relationship for several loaded jump conditions (see [19,26] for details).…”

“…Finally, we detailed a simple and field-based procedure to accurately compute Pmax from SJ or CMJ height measurements. The latter may allow researchers and practitioners to improve their assessment of Pmax, using SJ or CMJ height as inputs with a simple yet accurate computation method [7][8][9], of which calculation spreadsheets are freely available online (https://www.researchgate.net/publication/320146284_JUMP_FVP_profile_spreadsheet).…”