Force-Time Characteristics of the Countermovement Jump: Analyzing the Curve in Excel

Abstract

Full bibliographic details must be given when referring to, or quoting from full items including the author's name, the title of the work, publication details where relevant (place, publisher, date), pagination, and for theses or dissertations the awarding institution, the degree type awarded, and the date of the award.

A Novel Approach for Athlete Profiling: The Unilateral Dynamic Strength Index

“…Between-session reliability was good (ICC = 0.83-0.85) with acceptable pooled CV values also. These data suggest that PF is a useful metric to monitor during jump assessments from force plates, this also in line with previous suggestions (5,8,12). In addition, a significant difference (p = 0.04) was present between limbs for PF during the second test session, when limbs were quantified as left and right.…”

Effects of a Competitive Soccer Match on Jump Performance and Interlimb Asymmetries in Elite Academy Soccer Players

“…The dependant variables for the propulsive phase were: eccentric impulse (the sum of impulse from the end of unweighting period up until the end of the braking phase), concentric impulse (the sum of impulse from the end of the braking phase up until take off), peak force (maximum force obtained during the propulsive phase of the jump), and jump height (jump height was calculated using the velocity at takeoff). For the landing phase: landing impulse (the sum of impulse upon landing up until peak landing force) and peak landing force (maximum force obtained during the landing phase of the jump) were all later calculated in Microsoft Excel with force thresholds calculated from body weight ± 5 standard deviations (SD) (11,17,36).…”

Impact of Hydration Status on Electromyography and Ratings of Perceived Exertion During the Vertical Jump

“…Jump height from the force platform was calculated using the impulse -momentum method. The propulsive phase of each CMJ trial was identified using methods described by Chavda et al, (Chavda et al, 2018) and McMahon et al, (McMahon, Suchomel, Lake, & Comfort, 2018). Similar processing was adapted to SJ trials with the exclusion of an unweighting and braking phase.…”

“…SJ analysis began by finding the mean of one second of weighting once at the self-selected depth and then identifying the first instance in which ground reaction forces exceeded 5 standard deviations above the mean of the one second weighting to signify the initiation of movement. From this point, methods were identical to those used in the analysis of the CMJ (Chavda et al, 2018). Only the propulsive phase of the CMJ and SJ were used to determine mean muscle activity and the percentage of MVC during the jumping task.…”

“…Prior to each jump subjects were instructed to jump as explosively as possible to achieve maximal height. Preceding each jump, subjects were instructed to remain as still as possible to allow for body mass to be determined and then used in the calculation of the phases of jump as suggested by Chavda et al (Chavda et al, 2018). The use of a 3, 2, 1, jump countdown was used for each trial.…”