Efectos de la lazada de la zapatilla del corredor/a sobre las variables espaciotemporales, el confort, la frecuencia cardiaca y la percepción subjetiva del esfuerzo

Abstract

The objective was to analyze the effects of the type of loop on spatiotemporal variables, heart rate, comfort and perceived exertion, as well as the effect of time/fatigue. Twentyfour subjects were analyzed, using two types of loops; a) conventional cross loop and b) heel lock loop. All participants performed 2 tests on separate days and randomly distributed on treadmill. The running test consisted of a 5 min warm-up at 8 km/h and then a 20 min running test at 10 km/h with 1% gradient. The values of heart rate (p = 0.029, ES= 0.199) and perceived exertion (p<0,001, ES= 0.745) in relation to time and sex were higher towards the end of the test and in women. On the other hand, in reference to comfort, we found significant differences in the loop, where the values were significantly higher with the heel lock. Finally, in the spatiotemporal variables, significant differences were observed as a function of the instant, cadence increased (p=0.018, ES=0.183) and step length decreased (p=0.019, ES=0.166). And as a function of the loop in flight time (p=0.019, ES=0.227), contact (p=0.013, ES=0.248), height (p=0.022, ES=0.217) and step angle (p=0.024, ES=0.212). In conclusion, the variability of results of this study shows that the change of loop type can greatly vary running technique and this study can help to reduce the risk of running injuries