A randomized trial of the effects of dieting vs dieting with exercise on lactation performance

M. A. McCrory, L. A. Nommsen-Rivers, P. A. Mole, B. Lonnerdal, K. G. Dewey

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

To improve guidelines for weight loss during lactation, the impact of caloric restriction vs caloric restriction with aerobic exercise was studied in healthy, well-nourished exclusively breastfeeding women for 11 d (n = 60; final n=69 by Feb '97). At baseline, subjects were 12 ± 4 wk postpartum, age 32 ± 5 y and 32 ± 6 % fat. Baseline energy needs were determined by 4-d diet (weighed) and activity records (+ indirect calorimetry). The women were then randomly assigned to either a) a diet group (D; energy deficit of 35%); b) a diet plus exercise group (D/E; net energy deficit of 35%, 60% of this by caloric restriction and 40% by additional exercise); or c) a control group (C). All women exercised at least 2 d/wk during baseline; this level was maintained throughout the intervention in the D and C groups. The D/E group exercised 60-90 min/d for 9/11 d during the intervention. Breast milk volume (4-d of test-weighing) and maternal body composition (densitometry) were assessed prior to and during the intervention. Breast milk samples were obtained by 24-h alternate breast expression. Weight loss in the D and D/E groups was 1.9 and 1.6 kg, respectively, compared with only 0.2 kg in the C group (p<0.001). Maternal % body fat decreased by 1.0, 2.1, and 0.6 in the D, D/E and C groups, respectively (p=0.01). Fat-free mass decreased by 0.6 kg in the D group, but increased by 0.5 kg in the D/E group and 0.3 kg in the C group (p=0.006). Change in milk energy output did not differ significantly (+6, 17, and +14 kcal/d; p=0.32), nor did infant weight gain (205, 237, and 66 g; p=0.15) among the D, D/E and C groups, respectively. These results indicate that short-term weight loss of up to about 1.2 kg/wk is compatible with lactation, but that to preserve lean tissue this weight loss should be achieved by a combination of caloric restriction and a high level of aerobic exercise.

Original languageEnglish (US)
JournalFASEB Journal
Volume11
Issue number3
StatePublished - 1997

Fingerprint

Caloric Restriction
dieting
Lactation
Dilatation and Curettage
Weight Loss
exercise
weight loss
lactation
Nutrition
Exercise
Fats
energy
Human Milk
breast milk
Diet
Mothers
diet
Indirect Calorimetry
densitometry
Densitometry

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

McCrory, M. A., Nommsen-Rivers, L. A., Mole, P. A., Lonnerdal, B., & Dewey, K. G. (1997). A randomized trial of the effects of dieting vs dieting with exercise on lactation performance. FASEB Journal, 11(3).

A randomized trial of the effects of dieting vs dieting with exercise on lactation performance. / McCrory, M. A.; Nommsen-Rivers, L. A.; Mole, P. A.; Lonnerdal, B.; Dewey, K. G.

In: FASEB Journal, Vol. 11, No. 3, 1997.

Research output: Contribution to journalArticle

McCrory, MA, Nommsen-Rivers, LA, Mole, PA, Lonnerdal, B & Dewey, KG 1997, 'A randomized trial of the effects of dieting vs dieting with exercise on lactation performance', FASEB Journal, vol. 11, no. 3.
McCrory MA, Nommsen-Rivers LA, Mole PA, Lonnerdal B, Dewey KG. A randomized trial of the effects of dieting vs dieting with exercise on lactation performance. FASEB Journal. 1997;11(3).
McCrory, M. A. ; Nommsen-Rivers, L. A. ; Mole, P. A. ; Lonnerdal, B. ; Dewey, K. G. / A randomized trial of the effects of dieting vs dieting with exercise on lactation performance. In: FASEB Journal. 1997 ; Vol. 11, No. 3.
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abstract = "To improve guidelines for weight loss during lactation, the impact of caloric restriction vs caloric restriction with aerobic exercise was studied in healthy, well-nourished exclusively breastfeeding women for 11 d (n = 60; final n=69 by Feb '97). At baseline, subjects were 12 ± 4 wk postpartum, age 32 ± 5 y and 32 ± 6 {\%} fat. Baseline energy needs were determined by 4-d diet (weighed) and activity records (+ indirect calorimetry). The women were then randomly assigned to either a) a diet group (D; energy deficit of 35{\%}); b) a diet plus exercise group (D/E; net energy deficit of 35{\%}, 60{\%} of this by caloric restriction and 40{\%} by additional exercise); or c) a control group (C). All women exercised at least 2 d/wk during baseline; this level was maintained throughout the intervention in the D and C groups. The D/E group exercised 60-90 min/d for 9/11 d during the intervention. Breast milk volume (4-d of test-weighing) and maternal body composition (densitometry) were assessed prior to and during the intervention. Breast milk samples were obtained by 24-h alternate breast expression. Weight loss in the D and D/E groups was 1.9 and 1.6 kg, respectively, compared with only 0.2 kg in the C group (p<0.001). Maternal {\%} body fat decreased by 1.0, 2.1, and 0.6 in the D, D/E and C groups, respectively (p=0.01). Fat-free mass decreased by 0.6 kg in the D group, but increased by 0.5 kg in the D/E group and 0.3 kg in the C group (p=0.006). Change in milk energy output did not differ significantly (+6, 17, and +14 kcal/d; p=0.32), nor did infant weight gain (205, 237, and 66 g; p=0.15) among the D, D/E and C groups, respectively. These results indicate that short-term weight loss of up to about 1.2 kg/wk is compatible with lactation, but that to preserve lean tissue this weight loss should be achieved by a combination of caloric restriction and a high level of aerobic exercise.",
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