AN ELECTROMYOGRAPHIC COMPARISON BETWEEN THE SQUAT IN A DECLINE BOARD AND IN A FLAT SURFACE WITH DIFFERENT OVERLOADS

The purpose of this study was to compare the myoelectric activity among the squat on a decline (DS) and a flat surface (SS). Eight individuals completed 15 RM tests for both squats in different days. They did three sets of the situation of the day test with different overloads (no overload [NO], 30% 15 RM [30] and 60% 15 RM [60]). An increase was verified in the activity from standard to decline squat in Rectus Femoris (DS NO= 64,8%; DS 30= 66,8%; DS 60= 70%; SS NO= 33,7%; SS 30= 37,6%; SS 60= 42,8%), Vastus Lateralis (DS NO= 75,4%; DS 30= 80,9%; DS 60= 81,5%; SS NO= 51,9%; SS 30= 58,9%; SS 60=62,9%), Gastrocnemius Medialis (DS NO= 13,1%; DS 30= 14,3%; DS 60= 14,2%; SS NO= 9,4%; SS 30= 10,2%; SS 60= 10,6%) but not to Hamstrings. We also did not find differences in myoelectric activation with the use of a backpack, in either squat, with tested overloads