Effects of lower limb muscle strengthening on interface pressure in older adults undergoing inelastic compression: Randomized controlled clinical trial

Objective To analyze the effects of lower limb muscle strengthening on interface pressure (IP), static stiffness index (SSI), dynamic stiffness index (DSI), and walking pressure amplitude (WPA) in older adults undergoing inelastic compression therapy.Method Forty-three healthy older adults of both sexes (Age: 66.2 +/- 4.4 years) met the eligibility criteria and completed all stages of the study (Resistance Training - RT: N = 20; Control - CONT: N = 23). Body composition, strength and functional mobility of lower limbs, IP, SSI, DSI, and WPA were evaluated before and after intervention.Results The two-way ANOVA with repeated measures demonstrated a significant time-group interaction effect on muscular strength for 1-RM [F (1, 41) = 21.091; p <= 0.001], IP in the orthostatic position [F (1, 41) = 5.124; p <= 0.05], minimum WPA [F (1, 41) = 10.999; p <= 0.05], maximum WPA [F (1, 41) = 8.315; p <= 0.05], DSI minimum (F (1, 41) = 4.608; p <= 0.05), DSI maximum (F (1, 41) = 8.926; p <= 0.05), and on the delta DSI (F (1, 41) = 7.891; p <= 0.05).Conclusions In RT group, the increase in lower limb muscle strength was accompanied by an increase in IP in foot dorsiflexion and plantar flexion maneuvers, both in the standing position (DSI) and during gait (WPA).