Can changes in midsole bending stiffness of shoes affect the onset of joint work redistribution during a prolonged run?  

作　　者：Sasa Cigoja Jared R.Fletcher Benno M.Nigg 

机构地区：[1]Human Performance Laboratory,Faculty of Kinesiology,University of Calgary,Calgary,AB T2N 1N4,Canada [2]Department of Health and Physical Education,Mount Royal University,Calgary,AB T3E 6K6,Canada

出　　处：《Journal of Sport and Health Science》2022年第3期293-302,共10页运动与健康科学（英文）

基　　金：financially supported by the International Society of Biomechanics in Sports Student Mini Research Grant awarded to SC

摘　　要：Purpose This study aimed to investigate if changing the midsole bending stiffness of athletic footwear can affect the onset of lower limb joint work redistribution during a prolonged run.Methods Fifteen trained male runners(10-km time of<44 min)performed 10-km runs at 90%of their individual speed at lactate threshold(i.e.,when change in lactate exceeded 1 mmol/L during an incremental running test)in a control and stiff shoe condition on 2 occasions.Lower limb joint kinematics and kinetics were measured using a motion capture system and a force-instrumented treadmill.Data were acquired every 500 m.Results Prolonged running resulted in a redistribution of positive joint work from distal to proximal joints in both shoe conditions.Compared to the beginning of the run,less positive work was performed at the ankle(approximately 9%;p≤0.001)and more positive work was performed at the knee joint(approximately 17%;p≤0.001)at the end of the run.When running in the stiff shoe condition,the onset of joint work redistribution at the ankle and knee joints occurred at a later point during the run.Conclusion A delayed onset of joint work redistribution in the stiff condition may result in less activated muscle volume,because ankle plantar flexor muscles have shorter muscles fascicles and smaller cross-sectional areas compared to knee extensor muscles.Less active muscle volume could be related to previously reported decreases in metabolic cost when running in stiff footwear.These results contribute to the notion that footwear with increased stiffness likely results in reductions in metabolic cost by delaying joint work redistribution from distal to proximal joints.

关 键 词：Fatigue FOOTWEAR MECHANICS Performance Running 

分 类 号：G822[文化科学—体育训练]