Effect of cadence selection on peak power and time of power production in elite BMX riders: A laboratory based study

ABSTRACT

The aims of this study were to analyse the optimal cadence for peak power production and time to peak power in bicycle motocross (BMX) riders. Six male elite BMX riders volunteered for the study. Each rider completed 3 maximal sprints at a cadence of 80, 100, 120 and 140 revs · min^?1 on a laboratory Schoberer Rad Messtechnik (SRM) cycle ergometer in isokinetic mode. The riders’ mean values for peak power and time of power production in all 3 tests were recorded. The BMX riders produced peak power (1105 ± 139 W) at 100 revs · min^?1 with lower peak power produced at 80 revs · min^?1 (1060 ± 69 W, (F(2,15) = 3.162; P = .266; η² = 0.960), 120 revs · min^?1 (1077 ± 141 W, (F(2,15) = 4.348; P = .203; η² = 0.970) and 140 revs · min^?1 (1046 ± 175 W, (F(2,15) = 12.350; P = 0.077; η² = 0.989). The shortest time to power production was attained at 120 revs · min^?1 in 2.5 ± 1.07 s. Whilst a cadence of 80 revs · min^?1 (3.5 ± 0.8 s, (F(2,15) = 2.667; P = .284; η² = 0.800) 100 revs · min^?1 (3.00 ± 1.13 s, (F(2,15) = 24.832; P = .039; η² = 0.974) and 140 revs · min^?1 (3.50 ± 0.88 s, (F(2,15) = 44.167; P = .006; η² = 0.967)) all recorded a longer time to peak power production. The results indicate that the optimal cadence for producing peak power output and reducing the time to peak power output are attained at comparatively low cadences for sprint cycling events. These findings could potentially inform strength and conditioning training to maximise dynamic force production and enable coaches to select optimal gear ratios.     

Clifton Forge and Back Again

Abstract

Coming from small-town Appalachia, Josh Howard reflects on his career as a public historian with a focus on sport. He maps out his recent work at the National Baseball Hall of Fame, Lamar University, and other sport history work in explaining a journey from a background in statistics to one in public sport history. He concludes by offering some suggestions to better develop scholarship on the intersection of public history and sport history specifically through partnerships with professional sport franchises.     

A comparison of the Vane Kindergarten Test with the WPPSI and a measure of Self-Control

This study assessed the concurrent validity of the Vane Kindergarten Test (VKT), using scores on the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) as the criterion measure. In addition, VKT scores were correlated with kindergarten grades and the Self-Control Rating Scale (SCRS). The results indicated that the VKT could be used as a valid screening measure for kindergarten children, but that it tended to overestimate ability and was not a test independent of a child's ability for self-contorl.