Reliability of Leg and Vertical Stiffness During High Speed Treadmill Running.
In research, the accurate and reliable measurement of leg and vertical stiffness could contribute to valid interpretations. The current study aimed at determining the intraparticipant variability (ie, intraday and interday reliabilities) of leg and vertical stiffness, as well as related parameters, during high speed treadmill running, using the "sine-wave" method. Thirty-one males ran on a treadmill at 6.67 m∙s-1, and the contact and flight times were measured. To determine the intraday reliability, three 10-s running bouts with 10-min recovery were performed. In addition, to examine the interday reliability, three 10-s running bouts on 3 separate days with 48-h interbout intervals were performed. The reliability statistics included repeated-measure analysis of variance, average intertrial correlations, intraclass correlation coefficients (ICCs), Cronbach's α reliability coefficient, and the coefficient of variation (CV%). Both intraday and interday reliabilities were high for leg and vertical stiffness (ICC > 0.939 and CV < 4.3%), as well as related variables (ICC > 0.934 and CV < 3.9%). It was thus inferred that the measurements of leg and vertical stiffness, as well as the related parameters obtained using the "sine-wave" method during treadmill running at 6.67 m∙s-1, were highly reliable, both within and across days.
['Pappas|Panagiotis|P|', 'Dallas|Giorgos|G|', 'Paradisis|Giorgos|G|']
D003198:Computer Simulation D055119:Elastic Modulus D005080:Exercise Test D006801:Humans D007866:Leg D008297:Male D008954:Models, Biological D005082:Physical Exertion D015203:Reproducibility of Results D012420:Running D012680:Sensitivity and Specificity D055815:Young Adult
contact and flight time kinetics reproducibility step length and rate “sine-wave”