317 The relationship between toe grip force and muscle sizes of foot intrinsic and extrinsic muscles

Abstract

The purpose of this study was to analyze the relationship between force and muscle size on foot intrinsic and extrinsic muscles. Cross-sectional areas (CSA) of these muscles were measured by MRI, and maximum foot grip force was measured by specific designed dynamometers, in 12 young healthy participants (6 males, 6 females, age 20.1 ±0.7 yrs). Foot grip force was primarily related to the cross sectional area of plantar intrinsic foot muscle (PIFM CSA, r=0.68l). And the cross sectional area of tibialis posterior (TP CSA) and flexor hallucis longus (FHL CSA) were also significantly correlated with foot grip force (TP, r=0.630; FHL r=0.632). These results demonstrated that the foot grip force was influenced by both of the intrinsic and extrinsic muscles.