چکیده (انگلیسی):

Background: This prospective study explored the effects of endurance running (ER) in minimal versus standard running shoes on the foot’s
superficial layer intrinsic muscles and the function of the longitudinal arch. Our hypothesis was that running in minimal shoes would cause
hypertrophy in these muscles and lead to higher, stronger, stiffer arches.
Methods: The hypothesis was tested using a sample of 33 healthy runners randomized into two groups, a control group shod in traditional
running footwear and an experimental group shod in minimal support footwear, whose feet were scanned in an MRI before and after a 12-week
training regime. Running kinematics as well as arch stiffness and height were also assessed before and after the treatment period.
Results: Analysis of anatomical cross-sectional areas and muscle volumes indicate that the flexor digitorum brevis muscle became larger in both
groups by 11% and 21%, respectively, but only the minimally shod runners had significant areal and volumetric increases of the abductor digiti
minimi of 18% and 22%, respectively, and significantly increased longitudinal arch stiffness (60%).
Conclusion: These results suggest that endurance running in minimal support footwear with 4 mm offset or less makes greater use of the springlike
function of the longitudinal arch, thus leading to greater demands on the intrinsic muscles that support the arch, thereby strengthening the
foot.