Effect of Instability on Power and Speed in Bench Press

The aim of this study was to analyse and compare the speed and power parameters in bench press training in different degrees of instability: 1) stable (PBE), 2) with asymmetric load (PBA), 3) with oscillating load (PBO), 4) on fitball (PBF) and 5) on bosu (PBB). For this purpose, 20 male subjects (10 trained and 10 untrained) with specific experience in training under unstable conditions were evaluated with respect to mean propulsive velocity (MPV), maximum velocity (MV) and power (POT) with different types of external load: low load (40% of 1RM), medium load (60% of 1RM) and high load (80% of 1RM) in each condition.