Abstract
The Push Band has the potential to provide a cheap and practical method of measuring velocity and power during countermovement vertical jumping (CMJ). However, very little is known about whether it conforms to laboratory-based gold standards. The aim of this study was to assess the agreement between peak and mean velocity and power obtained from the belt-worn Push Band, and derived from three-dimensional motion capture, and vertical force from an in-ground force platform. Twenty-two volunteers performed 3 CMJ on a force platform, while a belt-worn Push Band and a motion capture system (a marker affixed to the Push Band) simultaneously recorded data that enabled peak and mean velocity and power to be calculated and then compared using ordinary least products regression. While the Push Band is reliable, it tends to overestimate peak (9–17%) and mean (24–27%) velocity, and when compared to force plate-derived peak and mean power, it tends to underestimate (40–45%) and demonstrates fixed and proportional bias. This suggests that while the Push Band may provide a useful method for measuring peak and mean velocity during the CMJ, researchers and practitioners should be mindful of its tendency to systematically overestimate and that its measures of peak and mean power should not be used.
Highlights
Countermovement vertical jump (CMJ) testing using a force platform is routinely conducted across a variety of sporting domains, as well as in many sports science research studies [1]
While the SEM of the peak and mean velocity and power from the different methods was relatively small (Figure 5A,B), and absolute (Figure 5C) and relative (Figure 5E) peak methods was relatively small (Figure 5A,B), and absolute (Figure 5C) and relative (Figure 5E) peak and mean velocity reliability were good and high to very high, and relative peak and mean power and mean velocity reliability were good and high to very high, and relative peak and mean power reliability were high to very high (Figure 5F), absolute Push Band peak and mean power exceeded reliability were high to very high (Figure 5F), absolute Push Band peak and mean power exceeded the the CV 10% cut-off threshold for acceptable absolute reliability
Based on literature that has assessed the validity of the obtained from the belt-worn Push Band and equivalent data derived from three-dimensional motion
Summary
Countermovement vertical jump (CMJ) testing using a force platform is routinely conducted across a variety of sporting domains, as well as in many sports science research studies [1]. The cost and the availability of other potentially more practical methods of assessing CMJ performance provide strength and conditioning practitioners with options to assess CMJ related parameters [4]. One such method is the Push Band. Very little is known about how the waist-borne method compares to laboratory-based gold standard methods of assessing parameters like peak and mean velocity and peak and mean power
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