Reproducibility of speed based on perception in overground and treadmill running

Details

Supervisors

Nguyen, Anh Phong

Faculty

Faculté des sciences de la motricité

Degree label

Master [120] en sciences de la motricité, orientation générale, à finalité spécialisée: kinésithérapie musculo-squelettique

Abstract

Background : The number of people who have taken up running has increased to become one of the most popular and accessible sport activities enjoyed by people worldwide. Treadmills are commonly used by coaches, physiotherapists and searchers for rehabilitation of injuries or for training by runners to simulate overground running. There is a high interest for researchers and clinicians to make analysis of running parameters on treadmill for the rehabilitation of runners. But the true question is: Does the treadmill’s data give us a true representation of the overground condition ? Objectives : 1. Compare how runners are capable to choose the suitable speed when asking to run at different levels of perceived effort (RPE) during two conditions : overground and on a motorized treadmill. 2. Identify if this selected speed / intensity based on RPE is reproducible from one trial to another but on the same condition. Study design : An observational cross sectional study Method : Twenty-one healthy individuals were recruited. Participants were asked to run 6 races for 1000m based on two different levels of RPE (4 races at 3 of RPE and 2 at 8 of RPE), half on MT and the other half overground (indoor athletic track). During the experiment, one investigator measured the heart rate with the polar device and the other investigator measured the biomechanics parameters with the RunScribe in addition to the speed based on perception. Investigators also asked the score of perceived rating of exertion they would give after the run to see if it corresponded to what was asked at first. Results : 1. For the first level of RPE (3 out of 10) : There is a significant difference for the speed overground of -2,19 Km/h (p<0,0001, 95% IC [-2,68 to -1,70]), runners select slower speed on MT + a significant difference for the HR overground of -10,12 BPM (p<0,0001, 95% IC [-13,01 to -7,23]), runner’s HR are less important on MT + a significant difference in the CR10 after the run overground of -0,34 (p=<0,0001, 95% IC [-0,49 to -0,19]), runners feel less tired after the run on MT. For the second level (8 out of 10) : Data shows a significant difference for the speed overground of -1,65 (p=0,0001, 95% IC [-2,33 to 0,96]), no significant difference for runner’s HR (p=0,087, 95% IC [-4,63 to 0,35]) and a significant difference in the CR10 after the run overground of -0,6 (p=0,0002, 95% IC [-0,97 to -0,36]). 2. The ICC between both runs at 3/10 shows a high correlation of 0,95 (95% IC [0,89 to 0,98]) overground and 0,87 (95% IC [0,68 to 0,48]) on MT. Conclusion : Participants select slower speed on treadmills when asking to run at the same level of perceived exertion (RPE), at low intensity (3) or all out (8). Doing so, their HR and feeling after the race was lower on MT. in addition, There a high correlation when comparing the reproducibility of the RPE as a tool for monitoring running speed.