“…Generally, studies proposed a continuous submaximal exercise session: some physical programmes consisted of a modulation of different activities (walking, rowing, cycling) with an intensity increase during the training period (ranged from 50 to 85% of heart rate reserve) (4,13), whereas others planned a repetitive but sole activity at the same intensity during the training duration (14). Previously, interval training (IWET) has been performed with efficiency in heart transplant recipients (15–18) and aged subjects (19). Allowing the achievement of greater amounts of total work with reduced metabolic demand than constant exercise (20), endurance interval training is generally more effective in improving VO 2peak than performing the same total work at constant exercise intensity in moderately trained male subjects (21).…”