Interlimb asymmetries of lower limb isometric strength for predicting plantar fasciitis in male amateur marathon runners: a prospective cohort study

The interlimb asymmetry of hip abduction isometric strength was associated with a greater likelihood of developing PF, and interlimb asymmetry of hip abduction isometric strength greater than 32.5% was a significant risk factor for the development of PF in male amateur marathon runners. The risk of PF occurence increased by 3.646 times if the interlimb asymmetry of hip abduction isometric strength greater than 32.5%. For clinicians, it is suggested to pay attention to the balanced development of bilateral muscle strength in the process of PF rehabilitation treatment, and regard the improvement of the interlimb asymmetry of hip abduction isometric strength as one of the rehabilitation therapies. Moreover, for runners and coaches, it is suggested that they should appropriately add unilateral or bilateral strength training (such as side-lying hip abduction training, clamshell exercise, supine bridge, etc.) in the daily training to ensure the balanced development of hip abduction strength, so as to prevent the occurrence of PF.