Sasa Cigoja1, Colin R Firminger2, Michael J Asmussen3, Jared R Fletcher4, W Brent Edwards5, Benno M Nigg6. 1. Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Canada. Electronic address: sasa.cigoja1@ucalgary.ca. 2. Biomedical Engineering Graduate Program, University of Calgary, Canada. 3. Department of Biology, Faculty of Science & Technology, Mount Royal University, Canada. 4. Department of Health and Physical Education, Mount Royal University, Canada. 5. Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Canada; Biomedical Engineering Graduate Program, University of Calgary, Canada. 6. Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Canada.
Abstract
OBJECTIVES: To investigate if lower limb joint work is redistributed when running in a shoe with increased midsole bending stiffness compared to a control shoe. DESIGN: Within-subject with two conditions: (1) commercially available running shoe and (2) the same shoe with carbon fibre inserts to increase midsole bending stiffness. METHODS: Thirteen male, recreational runners ran on an instrumented treadmill at 3.5m/s in each of the two shoe conditions while motion capture and force platform data were collected. Positive and negative metatarsophalangeal (MTP), ankle, knee, and hip joint work were calculated and statistically compared between conditions. RESULTS: Running in the stiff condition (with carbon fibre inserts) resulted in significantly more positive work and less negative work at the MTP joint, and less positive work at the knee joint. CONCLUSIONS: Increased midsole bending stiffness resulted in a redistribution of positive lower limb joint work from the knee to the MTP joint. A larger MTP joint plantarflexor moment due to increased vGRF at the instant of peak positive power and an earlier onset of MTP joint plantarflexion velocity were identified as the reasons for lower limb joint work redistribution.
OBJECTIVES: To investigate if lower limb joint work is redistributed when running in a shoe with increased midsole bending stiffness compared to a control shoe. DESIGN: Within-subject with two conditions: (1) commercially available running shoe and (2) the same shoe with carbon fibre inserts to increase midsole bending stiffness. METHODS: Thirteen male, recreational runners ran on an instrumented treadmill at 3.5m/s in each of the two shoe conditions while motion capture and force platform data were collected. Positive and negative metatarsophalangeal (MTP), ankle, knee, and hip joint work were calculated and statistically compared between conditions. RESULTS: Running in the stiff condition (with carbon fibre inserts) resulted in significantly more positive work and less negative work at the MTP joint, and less positive work at the knee joint. CONCLUSIONS: Increased midsole bending stiffness resulted in a redistribution of positive lower limb joint work from the knee to the MTP joint. A larger MTP joint plantarflexor moment due to increased vGRF at the instant of peak positive power and an earlier onset of MTP joint plantarflexion velocity were identified as the reasons for lower limb joint work redistribution.
Authors: Rebecca L Krupenevich; William H Clark; Samuel F Ray; Kota Z Takahashi; Howard E Kashefsky; Jason R Franz Journal: J Biomech Date: 2021-05-07 Impact factor: 2.789
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