Correction of protein-energy malnutrition in older adults: effects of a short-term aerobic training program

Twenty malnourished subjects (average age 67 years old) treated by cyclic enteral nutrition were assigned to an active or control group according to whether they took part or not in a 3-week aerobic training program. Subjects underwent the following tests on d(0)-d(1) and d(20)-d(21): calculation of a global nutritional deficiency index (GND), bioelectrical impedance analysis, evaluation of daily energy expenditures using a 24 h heart rate (HR) recorder and a pedometer, maximal voluntary isometric strength assessment (MVIS), and symptoms limited maximal oxygen uptake ((.)VO(2 max. SL) estimation. Although energy intakes were similar in both groups, active subjects showed greater improvements (P < 0.05) than control subjects regarding GND (-9.8 vs -4.8%), serum albumin and prealbumin. Active subjects also showed a greater increase (P < 0.05) in pedometer readings compared to control subjects. Reduction of resting HR was observed in active (-5 beat/mn, P < 0.05) whereas no significant changes in average HR were noted in either group, reflecting increased metabolic activity. Compared to control, active subjects showed significant (P < 0.05) improvements in MVIS (0.8 vs 0.1 N/kg) and (.)VO(2 max. SL) (5.5 vs 1.4 mL/min/kg). Short-term aerobic training has positive effects on nutritional recovery and functional capacities in elderly malnourished subjects and should be recommended whenever possible.