Acute effect of portable device Massage on Muscle Fatigue, Muscle Pain, and Physical Performance in active subjects: a cross-over randomized clinical trial

INTERVENTION: Experimental group: Massage was performed on the 50 participants for 5 minutes using the portable AVANUTRI® device with a frequency of 55Hz, amplitude of 16 mm, and spherical tip. Participants were positioned lying on their backs, and the massage was initiated in the distal‐proximal and proximal‐distal directions within a 20‐second interval. After completing this path, the researcher moved the device laterally and repeated the trajectory until the entire quadriceps was massaged. Control group: The same 50 participants underwent passive recovery. They were positioned lying on their backs and remained resting for 5 minutes. CONDITION: G11.427.550 Myalgia PRIMARY OUTCOME: It is expected to observe a reduction in muscle fatigue assessed by the visual analog scale ranging from 0 to 10, following the implementation of percussive massage intervention SECONDARY OUTCOME: Muscle pain in the quadriceps region was assessed as participants performed a squat with their dominant leg, indicating the perceived intensity of muscle pain in the quadriceps on a visual analog scale ranging from 0 to 10 The knee extensor muscle torque was evaluated using the PHYSIOCODE F‐01® dynamometer. Three measurements were taken with one‐minute intervals, and the maximum recorded value was converted into torque and normalized according to body mass The vertical jump height in centimeters was assessed using the Baiobit™ inertial sensor. Three jumps were performed with 30‐second intervals, and the highest value was recorded INCLUSION CRITERIA: Active participants aged 18 to 40; of both sexes; with at least 6 months of experience in leg extension exercises