Effects of Slow-speed Traditional Resistance Training, High-speed Resistance Training and Multicomponent Training With Variable Resistances on Molecular, Body Composition, Neuromuscular, Physical Function and Quality of Life Variables in Older Adults.

The training session will consist in a general warm-up, 6 resistance exercises, including 2 upper limb exercises (elbow curl and chest press), 2 lower limb exercises (lunge and standing hip abduction), and 2 exercises combining both upper and lower limbs at the same time (squat plus upright rowing and squat plus shoulder press) and finally the cooldown routine.The participants will perform in each training session 6 submaximal repetitions equivalent to 85% of the one-repetition maximum (1RM) and 3-4 sets per exercise (high intensity training sessions).

The participants will perform the same exercises than the TRADICIONAL group with12 submaximal repetitions equivalent to 40-50% 1RM (low-intensity) and 3-4 sets per exercise.

Participants will perform, in this order, balance exercises followed by resistance/coordination, aerobic/coordination and flexibility exercises in each session. The balance training will consist in static, dynamic and proactive balance exercises. In the resistance training block, the participants will perform 3-4 sets of 15 submaximal repetitions Participants will perform 2 resistance exercises (squat plus upright rowing and lunge) at traditional slow-speed (2s of concentric contraction and 2s of eccentric contraction).The intensity of the aerobic block will progress from 65 to 85% of the maximum heart rate over the training weeks.