the effect of a selected exercise protocol on trunk and lower limb muscle activity of older adults with both low back pain and pronated feet during walking

Background: low back pain is a common musculoskeletal condition that can impact a person’s ability to walk and move comfortably. pronated foot posture has been suggested as a potential contributor to low back pain, and this study examines its impact on muscle activity during gait in individuals with low back pain.aim: this study aimed to investigate whether pronated foot alters the activity timing of trunk and lower limb muscles during gait in low back pain patients.materials and methods: the sample of this study included 32 men with low back pain and pronated foot. participants were divided into control (n=15, with foot pronated only) and experimental (n=17, with both low back pain and foot pronated) groups. the experimental group did resistance training with thera-band for 12 weeks, 3 sessions per week. a wireless electromyography system with 9 pairs of bipolar surface electrodes was used to record the electromyography activity timing of back and lower limb muscles (sample rate: 2000 hz). two-way anova was used for statistical analysis.results: significant between-group differences were found at baseline onset of emg activity timing for gastrocnemious medialis (p<0.001), gluteus medius (p<0.001) and erector spinae at 3rd lumbar vertebral level (p=0.001) muscles. results indicated significant main effects of “time” for erector spinae at 3rd lumbar vertebral level offset (p=0.023), significant main effects of “group” for tibialis anterior offset (p= 0.039) and for erector spinae at 3rd lumbar vertebral level offset (p= 0.010).conclusion: the selected training program changed the timing of erector spinae at 3rd lumbar vertebral level in older adults with both low back pain and pronated feet during walking.