TY - JOUR
T1 - Reliability and Magnitude of Countermovement Jump Performance Variables
T2 - Influence of the Take-off Threshold
AU - Pérez-Castilla, Alejandro
AU - Fernandes, John F.T.
AU - Rojas, F. Javier
AU - García-Ramos, Amador
N1 - Publisher Copyright:
© 2021 Taylor & Francis Group, LLC.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - This study explored the influence of different take-off thresholds on the reliability and magnitude of countermovement jump (CMJ) performance variables. Twenty-three men were tested on two separate sessions. CMJ performance variables were obtained against three external loads (0.5–30-60 kg) using three take-off thresholds: 10 N (arbitrary value of 10 N), 5SD (mean value plus 5 standard deviations of the vertical force recorded during the flight phase), and PRF (peak difference between the vertical force trace and 0 N during the flight phase). No significant differences in reliability were observed between the three thresholds (CV and ICC values of one threshold were within 95% CI of the other thresholds). The magnitude of the variables generally differed between the 10 N threshold and the 5SD and PRF thresholds (P < .05), but not between the 5SD and PRF thresholds (P > .05). These results demonstrate that the take-off threshold influences the magnitude of CMJ performance variables but not their reliability.
AB - This study explored the influence of different take-off thresholds on the reliability and magnitude of countermovement jump (CMJ) performance variables. Twenty-three men were tested on two separate sessions. CMJ performance variables were obtained against three external loads (0.5–30-60 kg) using three take-off thresholds: 10 N (arbitrary value of 10 N), 5SD (mean value plus 5 standard deviations of the vertical force recorded during the flight phase), and PRF (peak difference between the vertical force trace and 0 N during the flight phase). No significant differences in reliability were observed between the three thresholds (CV and ICC values of one threshold were within 95% CI of the other thresholds). The magnitude of the variables generally differed between the 10 N threshold and the 5SD and PRF thresholds (P < .05), but not between the 5SD and PRF thresholds (P > .05). These results demonstrate that the take-off threshold influences the magnitude of CMJ performance variables but not their reliability.
KW - Force platform
KW - kinematic
KW - kinetic
KW - vertical jump
UR - http://www.scopus.com/inward/record.url?scp=85100180738&partnerID=8YFLogxK
U2 - 10.1080/1091367X.2021.1872578
DO - 10.1080/1091367X.2021.1872578
M3 - Article
AN - SCOPUS:85100180738
SN - 1091-367X
VL - 25
SP - 227
EP - 235
JO - Measurement in Physical Education and Exercise Science
JF - Measurement in Physical Education and Exercise Science
IS - 3
ER -