BACKGROUND: The "effort character" (EC) is a resistance training method without reaching muscle failure. It was defined by Gonzalez-Badillo and Gorostiaga Ayestaran (2002) as the relationship between the repetitions performed and the repetitions achievable. Then, the EC is at its maximum (ie, 100%) when the subject realizes all the repetitions possible in a series with any load. Therefore, an EC of 50% indicates execution of 50% of the repetitions achievable in a series. This study aimed to determine the effects of two programs of eight weeks of concurrent training (CT) with different EC over muscle strength (MS), cardiorespiratory fitness (CRF), functional mobility (FM), health-related quality of life (HRQoL), and lipid profile (LP) among hospital workers. METHODS: Fourteen hospital workers (age 41.1 +/- 10.8 years; body mass 63.0 +/- 10.8 kg; height 165.2 +/- 6.5 cm; body mass index (BMI) 23.0 +/- 3.4 kg/m2) were randomly assigned to an EC 50% (n = 7) or EC 100% (n = 7) group. RESULTS: The main finding was that both groups significantly improved in MS and FM levels but not HRQoL, with no statistical differences between EC 50% and EC 100% in adherence and any test despite performing half the volume of the strength workout. CONCLUSIONS: An eight-week CT program with different EC (ie, EC 50% versus EC 100%) seems to improve the MS and FM levels in hospital workers similarly. These findings could be very useful in health-training practices because of the possibility of planning training loads with half the volume of strength workouts without the loss of any training adaptation.

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