No changes during pregnancy in the net cost of cycling exercise.
作者信息
Spaaij C J, van Raaij J M, de Groot L C, van der Heijden L J, Boekholt H A, Hautvast J G
机构信息
Department of Human Nutrition, Wageningen Agricultural University, The Netherlands.
出版信息
Eur J Clin Nutr. 1994 Jul;48(7):513-21.
OBJECTIVE
To investigate whether work efficiency improves during pregnancy.
DESIGN
Longitudinal; energy expenditure measurements (ventilated hood system) before the onset of pregnancy and in weeks 13, 24 and 35 of gestation.
SUBJECTS
Healthy Dutch women (n = 26), recruited with advertisements in local newspapers and posters displayed in public buildings.
MAIN OUTCOME MEASURES
Resting metabolic rate (RMR); metabolic rate during cycling at workloads of 30, 45, 60 and 75 W (CMRgross); post-cycling metabolic rate (PCMRgross); net energy costs of cycling (CMRnet = CMRgross - RMR); net recovery costs after cycling exercise (PCMRnet = PCMRgross - RMR).
RESULTS
RMR, CMRgross and PCMRgross increased during pregnancy; under all conditions, metabolic rates were 0.9 kJ/min higher at 35 weeks gestation than before pregnancy (P < 0.05). CMRnet and PCMRnet showed no significant change during gestation.
CONCLUSIONS
Changes in metabolic rate during cycling exercise suggest that pregnancy does not induce an improvement of work efficiency.
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