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Lower limb joint loading during high-impact activities: implication for bone health
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DOI：10.1093/jbmrpl/ziae119.png)
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Abstract
En 中文
Osteoporosis results in low-trauma fractures affecting millions globally, in particular elderly populations. Despite the inclusion of physical activity in fracture prevention strategies, the optimal bone-strengthening exercises remain uncertain, highlighting the need for a deeper understanding of lower limb joint loading dynamics across various exercise types and levels. This study examines lower limb joint loading during high-impact exercises across different intensities. A total of 40 healthy, active participants were recruited (mean +/- SD: age of 40.3 +/- 13.1 yr; height 1.71 +/- 0.08 m; and mass 68.44 +/- 11.67 kg). Motion capture data and ground reaction forces of 6 different exercises: a self-selected level of walking, running, countermovement jump, squat jump, unilateral hopping, and bilateral hopping were collected for each participant. Joint reaction forces were estimated using lower body musculoskeletal models developed in OpenSim. Running and hopping increased joint forces compared to walking, notably at the hip (83% and 21%), knee (134% and 94%), and ankle (94% and 77%), while jump exercises reduced hip and ankle loading compared to walking (36% and 19%). Joint loading varied with exercise type and intensity, with running faster increasing forces on all joints, particularly at the hip. Sprinting increased forces at the hip but lowered knee and ankle forces. Higher jumps intensified forces on all joints, while faster hopping reduced forces. The wide variation of lower limb joint loading observed across the exercises tested in this study underscores the importance of implementing diverse exercise routines to optimize overall bone health and strengthen the musculoskeletal structure. Practitioners must therefore ensure that exercise programs include movements that are specifically suitable for their intended purpose. Osteoporosis is a global health concern, particularly among the elderly, leading to increased risk of fractures. Although physical activity is recommended to prevent fractures, the most effective bone-strengthening exercises remain unclear. This study aimed to quantify how different high-impact exercises affect lower limb joint loading dynamics. Forty healthy, active participants with an average age of 40 yr performed 6 exercises: walking, running, jumping, and hopping, at various intensities. Motion capture technology and computational modeling were used to analyze joint forces at the hip, knee, and ankle. Results showed that running and hopping increased joint forces compared to walking, particularly at the hip and knee. Conversely, jumping exercises reduced hip and ankle loading. Joint loading varied across exercise types and intensities; for example, running faster increased forces primarily on the hip, while jumping higher increased forces on all joints. Conversely, faster hopping reduced forces. These findings highlight the importance of incorporating diverse exercises into bone-strengthening routines to optimize overall bone health and musculoskeletal strength. Healthcare practitioners should tailor exercise programs to individual needs, ensuring they include appropriate movements for desired outcomes. Graphical Abstract
Keywords:
high-impact exercises
exercise intensity
lower limb joints
joint contact force
musculoskeletal modeling
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