Hop og "hopping" af elite og amatør orienteringsløbere korrelerer med sprint og løb
PURPOSE: Jumping and hopping are used to measure lower-body muscle power, stiffness, and stretch-shortening cycle utilization in sports, with several studies reporting correlations between such measures and sprinting and/or running abilities in athletes. Neither jumping and hopping nor correlations with sprinting and/or running have been examined in orienteering athletes. METHODS: We investigated squat jump (SJ), countermovement jump (CMJ), standing long jump (SLJ), and hopping performed by 8 elite and 8 amateur male foot-orienteering athletes (29 ± 7 y, 183 ± 5 cm, 73 ± 7 kg) and possible correlations to road, path, and forest running and sprinting performance, as well as running economy, velocity at anaerobic threshold, and VO2peak from treadmill assessments. RESULTS: During SJs and CMJs, elites demonstrated superior relative peak forces, time-to-peak forces, and pre-stretch augmentation albeit lower SJ heights and peak powers. Between-group differences were unclear for CMJ heights, hopping stiffness, and most SLJ parameters. Large pair-wise correlations were observed between relative peak and time-to-peak forces and sprinting velocities; time-to-peak forces and running velocities; and pre-stretch augmentation and forest running velocities. Pre-stretch augmentation and time-to-peak forces were moderately correlated to VO2peak. Correlations between running economy and jumping or hopping were small or trivial. CONCLUSIONS: Overall, our elites exhibited superior stretch-shortening cycle utilization and rapid generation of high relative maximal forces, especially vertically. These functional measures were more closely related to sprinting and/or running abilities, indicating benefits of lower-body training in orienteering.
International Journal of Sports Physiology and Performance, 2014, Vol 9, Issue 6