摘要：Reiser FC, Bonuzzi GMG, Lira JLO, Bonfim BMA, Durante BG,Santos Filho SJA, Cardoso JMD, Soares MAA, Miotto H,Tavares LD. Manual Resistance as a Tool to Increase MuscleActivity and Time under Tension in Strength Exercises. JEPonline2018;21(2):139-149. The purpose of this study was to investigate themuscle activity of Dumbbell Fly with and without Manual Resistance(MR) in isometric conditions of shoulder flexor muscles: (a) anteriordeltoid (AD); (b) pectoralis major clavicular fibers (PMC); and (c)sternocostal fibers (PMS) muscles. Twenty health well trained menvolunteered for the study (age: 27.2 ± 6.6 yrs; stature: 1.83 ± 0.08 m;mass: 87.9 ± 9.2 kg; with 6.4 ± 3.2 yrs of lifting experience). Muscleactivation of the AD, PMC and PMS was higher on Dumbbell Fly(DF) plus MR (DFMR) in all conditions compared with the DumbbellFly without MR (DFW). The AD demonstrated an increase of muscleactivation in the Incline plane when compared with Horizontal, whilethe PMS showed an inverted pattern. The changes in planes did notpromote a change in PMS activation. The manual resistancepotentialized muscle activation of shoulder flexors when comparedwith only the dumbbell.
