Dalleau G, Belli A, Viale F, Lacour J R, Bourdin M
Centre Universitaire de Recherche en Activités Physiques et Sportives, Faculté des Sciences et Technologies, Université de la Réunion, Le Tampon, France.
Int J Sports Med. 2004 Apr;25(3):170-6. doi: 10.1055/s-2003-45252.
A new method to measure the leg stiffness in hopping and bouncing, with simple technical equipment and under field conditions, is introduced and validated. The leg stiffness (K (N)) was calculated from only contact and flight times measured by a contact mat. It was compared to the reference stiffness (K (R)) obtained from force platform measurements. Eight subjects performed, first, submaximal hopping movements at different frequencies (1.8 to 4 Hz, by step 0.2 Hz) and, second, maximal hopping. In sub maximal hopping K (N) was significantly correlated with K (R) (r = 0.94; p < 0.001) and the difference between K (N) and K (R) ranged from -7.2 % to 6.9 % (at 1.8 and 3.6 Hz respectively) with a limit of agreement of -1.5 kN x m (-1). In maximal hopping K (N) was also related to K (R) (r = 0.98, p < 0.001) and the inter individual rank order was respected (R = 0.87). It was concluded that the new method could be applied to study extensively intra individual and inter individual variations of leg stiffness in respectively sub maximal and maximal hopping and thus to simplify further investigations in field conditions of the role of stiffness regulation in the optimization of human locomotion.
介绍并验证了一种在跳跃和弹跳过程中测量腿部刚度的新方法，该方法使用简单的技术设备且可在现场条件下进行。腿部刚度（K（N））仅根据接触垫测量的接触时间和飞行时间来计算。将其与通过力平台测量获得的参考刚度（K（R））进行比较。八名受试者首先进行了不同频率（1.8至4Hz，步长为0.2Hz）的次最大跳跃运动，其次进行了最大跳跃。在次最大跳跃中，K（N）与K（R）显著相关（r = 0.94；p <0.001），K（N）与K（R）之间的差异范围为-7.2%至6.9%（分别在1.8和3.6Hz时），一致性界限为-1.5kN·m（-1）。在最大跳跃中，K（N）也与K（R）相关（r = 0.98，p <0.001），并且个体间的排名顺序得到尊重（R = 0.87）。得出的结论是，该新方法可用于广泛研究次最大和最大跳跃中腿部刚度的个体内和个体间差异，从而简化在现场条件下对刚度调节在人类运动优化中作用的进一步研究。
