This study sought to analyze the effects of subjects` wearing weightlifting lumbar support belts on surface electromyographic recordings of the erector spinae muscle group while the subject executed parallel squats. Ten healthy college-age men with weightlifting experience participated in this study. Participants completed a total of 6 repetitions of high-bar parallel back-squats at loads equaling 60% of their 1 repetition maximum. Experimental conditions required subjects to perform 6 squats, 3 while wearing a belt and 3 without. Electromyographic electrodes recorded muscle activity at 800 Hz on both the right and left erector spinae at the lumbar (L3- L5) and thoracic (T5-T7) regions during all lifts. The results indicate that subjects` mean erector spinae activity was greater (p < 0.0125) in the lumbar region of the spine when wearing weight belts (±258 SD; 69.0 analog-to-digital units) during squatting exercises than the mean activity in subjects who were not wearing weight belts (±235 SD; 71.3 analog-to-digital units).
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