Knowledge of results during vertical jump testing: an effective method to increase the performance but not the consistency of vertical jumps

Abstract

This study aimed to determine whether the provision of jump height feedback (knowledge of result; KR) can increase the performance and the consistency of output variables. In a randomised order, sixteen participants performed six squat or countermovement jumps (three from a 90º knee angle and three from a selfpreferred knee angle) with or without KR over four sessions. The provision of KR significantly increased peak force (p = 0.046, 1.83%), mean force (p = 0.037, 1.45%), peak velocity (p < 0.001, 3.71%), mean velocity (p = 0.004, 3.44%), peak power (p < 0.001, 4.22%) and mean power (p = 0.001, 4.69%). A high within-session reliability was observed for all variables (coefficient of variation [CV] ≤ 5.62%, intraclass correlation coefficient [ICC] ≥ 0.95). No systematic differences in reliability were detected between the jumps performed without KR (CV = 3.00 ± 1.38%, ICC = 0.97 ± 0.03) and with KR (CV = 3.04 ± 1.49%, ICC = 0.97 ± 0.04). These results suggest that the provision of jump height feedback during vertical jump testing is effective to enhance vertical jump performance but it does not reduce the variability between jumps.

Establishing the Noise: Interday Ecological Reliability of Countermovement Jump Variables in Professional Rugby Union Players

“…Obtaining maximal effort in CMJ assessments is critical to obtaining valid results, but it is an often overlooked aspect of assessing the reliability of a variable. As feedback on jump height achieved during testing improves CMJ performance (13), we ensured that immediate analysis (i.e., provided by the software) was visible in the testing area, in an endeavor to create an environment of group encouragement aimed at increasing motivation, effort, and performance (13). In our experience in professional sport, immediate feedback to the athlete on their performance and a competitive environment drive more consistent maximal effort from the athletes, and this may have contributed to the lower CVs and higher ICCs observed for a number of variables, compared with the previous work.…”

Kinetic and Kinematic Assessment of the Band-Assisted Countermovement Jump

“…The nylon cord of a linear position transducer was held in their right hand and on their left shoulder. Subjects were instructed to lower themselves to a selfselected depth before performing a rapid countermovement before jumping as high as possible (14,15,32). For the assisted conditions, a band (104.4 cm [41 inches], Strength Band, Perform Better, United Kingdom) was attached to a rig (Free standing, BLK BOX, United Kingdom) at either 2.15 (n 5 12) or 2.44 m (n 5 8) (for those shorter and taller than 1.8 m, respectively) above the force platform (see Figure 1 for further details).…”

Applying augmented feedback in basketball training facilitates improvements in jumping performance

“…The effect of augmented feedback on jumping performance was tested in recent studies (García-Ramos et al, 2020;Keller, Lauber, Gehring, Leukel, & Taube, 2014;Wälchli, Ruffieux, Bourquin, Keller, & Taube, 2016). Jumps are relevant because they play an important role in many sports disciplines (e.g.…”