Feasibility and Effectiveness of Concurrent Exercise Training on Frail Older Adults Living in Nursing Homes

The exercise intervention will take place at the nursing homes and consists of 12 weeks of supervised concurrent exercise training, performed thrice weekly on nonconsecutive days to avoid overtraining and fatigue. Each session will last 50-60 min and consist of a warm-up, resistance plus aerobic training, and a 5-min cool-down period. The resistance training will comprise 2-3 sets of 10 to 15 repetitions with a load equivalent to 40 to 70% of the 1-repetition maximum (1RM) for upper (i.e., bicep curl) and lower body exercises (i.e., seated knee extension). The sit-to-stand exercise will be performed as fast as possible according to each participant's capacity without external load. The recovery between sets is between 1 and 2 min. Afterwards, participants will perform walking exercises with changes in pace and direction. The duration of the aerobic training will progress from 5-10 min duration in the first weeks to 10-15 min. The sessions will end with stretching exercises.The exercise