Time-course effects of endurance training on fat oxidation in sedentary elderly people

Abstract

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 AE 2.3 y). MEASUREMENTS: 24 h indirect calorimetric measurements under standardised conditions: light-activity programme, ®xed 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 ®rst 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 ( AE 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 À0.56, 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.

Nutrition education training of health workers and other field staff to support chronically deprived communities

“…It appears than in the very few studies done with longer term training (14 weeks) fat oxidation is not increased 57,58 . This may be in connection with the failure to increase energy expenditure in those conditions.…”

“…In longitudinal trials, resting fat oxidation is reduced by bed-rest 55 and increased by short term endurance and resistance training (8 weeks 50,56,57 ). It appears than in the very few studies done with longer term training (14 weeks) fat oxidation is not increased 57,58 .…”

Behavioral and physiological regulation of body fatness: a cross-sectional study in elderly men

“…The tests were all performed on the same cycloergometer (Ergomeca, Monark, Sweden) under cardiovascular supervision by a cardiologist, as described previously. 15 Maximal oxygen uptake (VO 2max ) …”

“…The energy supply (ES) was calculated to meet each subject's energy needs on a personal basis. For that purpose, expected daily EE was calculated from the duration and the energy cost of the various activities in the calorimeters (e.g., walking) 15 and from each subject's predicted BMR. 17 Indirect calorimetry measurements.…”

“…Respiratory gas exchanges were measured continuously using two open-circuit wholebody calorimetric chambers as described previously. 15 Gas analyzers were calibrated upon commencement, after 13 h (evening) and at the end of the 24-h measurement period using standard gas mixtures. Gas exchanges were computed from the minute-by-minute measurement of outlet air flow, differences in gas concentrations, atmospheric pressure, chamber air temperature and hygrometry, and taking into account the gas analyzers drifts and the variations of the volumes of CO 2 and O 2 in the chambers.…”