Actividad de músculos intrínsecos del pie durante un agarre máximo. Un estudio descriptivo en corredores

This study aimed to describe the percentage of intrinsic foot muscles (IFM) activation during maximal toe grip in amateur runners. In this descriptive study, ten amateur runners (age = 22.5 ± 2.8 years; height = 1.67 ± 0,08 m; weight = 67.6 ± 12.0 kg; sex= five female, five male) were evaluated. All volunteers provided prior informed consent. Myoelectric activity was assessed in six IFM: extensor digitorum brevis (EDB), first dorsal interossei (DI), abductor digiti minimi (ADM), flexor digitorum brevis/quadratus plantae (FDB/QP), flexor hallucis brevis (FHB), and abductor hallucis (AH). This measurement was conducted through surface electromyography (EMG) during maximum toe grip. The amplitude of these signals was expressed as a percentage of their peak amplitude during a maximum voluntary contraction (%MCV), which was captured in specific tests for each IFM. All data were analyzed using descriptive statistics, including measures of central tendency (mean) and dispersion (standard deviation). The FDB/QP (71.0 ± 10.9%MVC), DI (62.4 ± 24.1%MVC), and ADM (46.1 ± 18.1%MVC) muscles exhibited greater activity during maximum toe grip. In contrast, the muscle that displayed the lowest activity during grip was the EDB (7.5 ± 5.7%MVC). In conclusion, it was observed that the level of activation of each IFM during grip varied, with higher activation in the FDB/QP muscle, which is directly involved in plantar flexion of the metatarsophalangeal joint.