Intersession reliability of kinematic and kinetic variables during vertical jumps in men and women

To investigate the intersession reliability of selected kinematic and kinetic variables during countermovement vertical jumps (CMJs). Thirty-five men and 35 women performed CMJs on a force platform during four testing sessions each separated by 1 wk. Kinematic variables included time in the air (TIA...

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Bibliographic Details
Published in:International journal of sports physiology and performance 2009-09, Vol.4 (3), p.317-330
Main Authors: Moir, Gavin L, Garcia, Alberto, Dwyer, Gregory B
Format: Article
Language:English
Subjects:
Athletic Performance - physiology
Biomechanical Phenomena
Exercise Test
Female
Follow-Up Studies
Gender differences
Humans
Kinematics
Male
Movement - physiology
Muscle Strength - physiology
Reproducibility of Results
Variables
Women
Young Adult
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Summary:To investigate the intersession reliability of selected kinematic and kinetic variables during countermovement vertical jumps (CMJs). Thirty-five men and 35 women performed CMJs on a force platform during four testing sessions each separated by 1 wk. Kinematic variables included time in the air (TIA), take-off velocity (TOV), total vertical displacement of the center of mass (TJH), and countermovement depth, whereas kinetic variables included positive impulse, negative impulse, vertical stiffness, and rates of force development. Systematic bias was assessed by calculating the 90% confidence interval of the change in the mean between consecutive testing sessions and between the first and final testing session for each variable. Coefficients of variation (CV) and intraclass correlation coefficients (ICC) were also calculated. Systematic bias was observed only for peak rate of force development during the concentric phase of the movement. For TIA, TOV, and TJH, CV values ranged from 1.7% to 6.6%, with ICC values ranging from 0.82 to 0.97. The other variables showed greater variation (CV range: 1.7% to 39.9%; ICC range: 0.04 to 0.99). Only slight gender differences were found in the reliability statistics, and the reliability of most of the variables was diminished as the time between the testing sessions was increased. Even though practitioners can expect good reliability for jump height measured from a force platform in men and women, other kinematic and kinetic variables often assessed during vertical jumps may not be reliable.
ISSN:1555-0265
1555-0273
DOI:10.1123/ijspp.4.3.317