Intra-Session Reliability of Sprint Performance on a Non-Motorised Treadmill for Healthy Active Males and Females

Abstract

This study examined the intra-session reliability of sprint performance on a non-motorized treadmill amongst healthy, active male and female adults. One hundred and twenty participants (males n = 77; females n = 45) completed two familiarization sessions, followed by a third session that consisted of three trials (T1, T2, T3) of maximal sprints (4-s), interspersed by three minutes of recovery. Combining males and females exhibited moderate-to-excellent test-retest reliability (intra-class correlation coefficient, ICC), minimal measurement error (coefficient of variation, CV) and trivial differences between trials (effect size, ES) for speed, power, total work and acceleration (ICC = 0.82–0.98, CV = 1.31–8.45%, ES = 0.01–0.22). The measurement error was improved between comparisons of T1 vs. T2 (CV = 1.62–8.45%, ES = 0.12–0.22) to T2 vs. T3 (CV = 1.31–6.56%, ES = 0.01–0.07) and better for females (CV = 1.26–7.94%, ES = 0.001–0.26) than males (CV = 1.33–8.53%, ES = 0.06–0.31). The current study demonstrated moderate-to-excellent reliability and good-moderate measurement error during a 4-s sprint on a non-motorized treadmill. However, sex had a substantial impact with females exhibiting better values. Practitioners should employ at least two separate trials within a session, in addition to multiple familiarization sessions, to achieve reliable non-motorized treadmill sprint performances.

Concurrent-Validity and Reliability of Photocells in Sport: A Systematic Review

“…Nevertheless, the majority of articles indexed in this review have not reported the adjustment of the sensitivity of the infrared sensor, which controls the trigger sensitivity of the signal (Altmann et al, 2018a(Altmann et al, , 2018bHaugen et al, 2014a;Haugen and Buchheit, 2016). than that of the trunk and the total center of mass, which might cause the timing gate to be prematurely or repeatedly triggered when using single beam photocells (Doma et al, 2023;Haugen and Buchheit, 2016). Altmann et al (2018) showed that measuring horizontal displacement speed from a standing starting position with single beam photocells yielded a poor ICC (ICC = 0.278) in the first 10 m, likely because the lower running speeds and shorter time frames during the acceleration phase increased the magnitude of this error (Altmann et al, 2018;García-López et al, 2012).…”