Predicting Diaphyseal Cortical Bone Status Using Measures of Muscle Force Capacity

AbstractPurposeMuscle cross sectional area (MCSA) is often used as a surrogate for the forces applied to bones during physical activity. Though MCSA is a strong predictor of cortical bone status, its use makes assumptions about the relationship between muscle size and force that are inaccurate. Furthermore, to measure MCSA and other muscle force surrogates typically requires expensive and/or radiative laboratory equipment. Thus, this study aimed to determine whether clinical lab- and field-based methodologies for measuring muscular force capacity accounted for similar variance in diaphyseal cortical bone status as a commonly used muscular force surrogate; MCSA, at the mid-tibia in young men and women.MethodsHealthy young adults (n = 142, 19.7 ± 0.7 yo, 52.8% female) were assessed via peripheral quantitative computed tomography at the mid-tibia for cortical bone status and MCSA. Muscle force capacity was measured via Biodex dynamometer, Nottingham leg extensor power rig, and Vertec vertical jump. Regression analysis compared the independent variance predicted by each muscle force measure to that of MCSA, accounting for relevant confounders.ResultsMCSA, knee extension peak torque, and peak anaerobic power from vertical jump were independent predictors of select cortical structural outcomes (cortical thickness and area, periosteal and endosteal circumference, and estimated strength) accounting for up to 78.4% of the variance explained (all p<.05 however cortical volumetric bone mineral density was unrelated to any measure or surrogate of muscle force capacity.conclusionsmcsa is a strong independent predictor structure both lab- and field-based measures peak torque anaerobic power are promising alternatives explaining similar sometimes greater variance than mcsa. purpose cross sectional area often used as for the forces applied bones during physical activity. though mcsa status its use makes assumptions about relationship between size that inaccurate. furthermore other surrogates typically requires expensive radiative laboratory equipment. thus this study aimed determine whether clinical methodologies measuring muscular capacity accounted in diaphyseal commonly at mid-tibia young men women. methods healthy adults yo female were assessed via peripheral quantitative computed tomography measured biodex dynamometer nottingham leg extensor rig vertec vertical jump. regression analysis compared predicted by each accounting relevant confounders. results knee extension from jump predictors select structural outcomes thickness periosteal endosteal circumference estimated strength up explained p capacity. conclusions accepted publication: february corresponding author: simon higgins department exercise science koury center elon university campus box nc telephone: e-mail: shiggins8 no sources funding preparation manuscript. presented clearly honestly without fabrication falsification inappropriate data manipulation. authors declare conflict interest. present do not constitute endorsement american college sports medicine. medicine>

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