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Effects of exercise on plasma lipids and metabolism of lactating women
Lovelady CA, Nommsen-Rivers LA, McCrory MA, Dewey KG
Medicine and Science in Sports and Exercise 1995 Jan;27(1):22-28
clinical trial
4/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

To examine the effects of exercise on plasma lipids and metabolism during lactation, sedentary, exclusively breast-feeding women were randomly assigned to an exercise (E) or control (C) group at 6 to 8 wk postpartum. E subjects performed aerobic exercise 45 min/d, 5 d/wk, for 12 wk. Resting metabolic rate (RMR), energy expenditure, body composition, and dietary intake were measured at 6 to 8, 12 to 14, and 18 to 20 wk postpartum. Maximum oxygen uptake (VO2max), postprandial insulin, glucose, and thermic response, and plasma lipid levels were measured at 6 to 8 and 18 to 20 wk. VO2max increased by 25% versus 5% in the E versus the C group, respectively (p < 0.0001). RMR was similar between groups and did not change over time. Weight and percent body fat declined (p < 0.01) during the study, but there was no difference between E and C groups. Exercise marginally increased high-density lipoprotein cholesterol levels (p < 0.08), but did not affect other lipid concentrations. Insulin response decreased as VO2max increased (p = 0.05). There was no effect of time or group on glucose or thermic response. Exercise improves cardiovascular fitness during lactation, but does not increase the rate of postpartum weight loss.

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