Effects of Shoe Midsole Hardness on Lower Extremity Biomechanics during Jump Rope in Healthy Males.

Hai-Bin Yu,Wei-Hsun Tai,Jing Li,Wei-Ya Hao,Rui Zhang,Jian-Zhi Lin

doi:10.3390/healthcare9101394

Abstract

This study investigated differences in lower extremity muscle activations and vertical stiffness during a 2.2 Hz jump rope exercise with different midsole hardnesses (45, 50, 55, and 60 Shores C). Twelve healthy male participants wore customized shoes with different hardness midsoles and performed jump rope exercises in a random order. A nine-camera motion analysis system (150 Hz), a force platform (1500 Hz), and a wireless electromyography (EMG) system (Noraxon, 1500 Hz) were used to measure the biomechanical parameters during the jump rope exercise. The biceps femoris %MVC of barefoot participants was significantly greater than that of those wearing the 45 Shores C (p = 0.048) and 55 Shores C (p = 0.009) midsole 100 ms before landing. The vastus medialis %MVC of barefoot participants was significantly greater than that of those wearing the 55 C midsole (p = 0.005). Nonsignificant differences in vertical stiffness were found between midsole hardnesses and barefoot. Lower extremity muscle activation differed between conditions. The results of this study indicate that for repetitive activities that entail multiple impacts, sports shoes with a low midsole hardness (e.g., 50 Shores C or 45 Shores C) may be appropriate. It is important to provide customers with information regarding midsole hardness in shoe product labeling so that they properly consider the function of the shoes.

Highlights

Jump rope is an activity widely used in physical education and sport training to promote health and fitness [1]
The results demonstrate that vastus medialis of barefoot participants has a significantly greater peak %MVC than that oris of barefoot participants has a significantly greater peak %MVC than that o of those wearing 55 Shores C midsole footwear during the M1 stage
Hz for s; no significant difference in vertical stiffness among the different shoes ness conditions, and the results show that muscle activations did not change wi differences

Summary

Introduction

Jump rope is an activity widely used in physical education and sport training to promote health and fitness [1]. Previous studies indicated that jump rope can be learned without training, and only a small space is needed [2,3]. It is beneficial to cardiorespiratory [4], strength [5], agility [2], coordination [6], and bone health [7]. National Health Standards for Physical Fitness of Student from the Ministry of Education of. A jump rope test is conducted as an element of entering higher education admission, which means that at least 282 million students must participate in this activity. The potential risks of jump rope should be identified, and, as such, footwear selection is an important factor

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