Deskriptiv studie av vertikal acceleration vid löpning på olika underlag

Sammanfattning: Title: Descriptive study of vertical acceleration when running on different ground surfaces Aim The purpose of the study was to map the vertical upward acceleration when running on different ground surfaces in different running velocities and also to investigate if there is any differences in vertical upward acceleration between different ground surfaces and different running velocities. Method Ten test subjects ran on four common orienteering ground surfaces (wet bog, flat forest, gravel and cutting area) in three subjective running velocities (jogging, competition speed and maximum speed). The vertical acceleration was measured by Catapult Vector X7 (Catapult Sports, Melbourne, Australia) and the acceleration value for the first and second acceleration peak under every support phase was noted and analysed. Six one-way ANOVA dependent tests was used to assess if there is any significant differences for the acceleration value for the first respective the second acceleration peak between the different ground surfaces. Results The result showed that the acceleration value for the first and the second acceleration peak is significant lower (p<0,0083) when running in wet bog compared with running on the other three ground surfaces, with exception for when running in maximum velocity for the second acceleration peak (p>0,05) and competition speed when comparing gravel with wet bog for the second acceleration peak (p0<0,0083 och pk<0,05) according to the corrected significans level (0,0083) and the corrected p-values. Conclusions Thus, running in wet bog can be considered less mechanical loading on the locomotor apparatus (joints, ligament and skeleton) than running on gravel, in flat forest and in cutting areas (with exception for when running in maximum speed for the second acceleration peak) since the first acceleration peak is signifikant lower when running in wet bog irrespective of running velocity and the second acceleration peak is signifikant lower or potentially significant lower when running in wet bog when jogging and running in competition speed.