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Time-course effects of endurance training on fat oxidation in sedentary elderly people
B Morio1, C Montaurier, P Ritz
1Centre de Recherche en Nutrition Humaine d'Auvergne, Université d'Auvergne, Laboratoire de Nutrition Humaine, Clermont-Ferrand, France.
Objective:
To investigate alterations in whole body fat oxidation after 7 and 14 weeks of progressive endurance training in sedentary elderly subjects.
Design:
Longitudinal, 14 weeks of progressive endurance training on a cycle ergometer (3 training sessions per week). Full sets of measurements were performed before, and after 7 and 14 weeks of training.
Subjects:
13 healthy sedentary subjects (5 men, 8 women) (age 62.8 +/- 2.3 y).
Measurements:
24 h indirect calorimetric measurements under standardised conditions: light-activity programme, fixed food composition, neutral daily energy balance. Body composition (by isotope dilution and skinfold thicknesses). Maximal oxygen consumption.
Results:
Loss of 0.7 kg fat mass in the first 7 weeks of training and a further 2.4 kg of fat in the second 7 weeks. There was a transient increase in sleeping fat oxidation after 7 weeks of training (+26.1%), associated with transient increase in daily fat oxidation (+/- 11.9%), but fat oxidation then returned to baseline values in the second 7 weeks. There was a correlation between within-subject changes in sleeping fat oxidation after 7 weeks of training and variations in FFM (r = 0.62, P = 0.02) and maximal oxygen consumption (r = -0.56, P < 0.05).
Conclusion:
In sedentary elderly subjects, progressive endurance training was associated with a transient increase in sleeping fat oxidation and daily fat oxidation. In free-living conditions, possible changes in daily fat oxidation may have induced a negative fat balance, as judged by fat mass loss.