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PEDIATRICS Vol. 106 No. 4 October 2000, p. e49

ELECTRONIC ARTICLE:
Relations of Parental Obesity Status to Physical Activity and Fitness of Prepubertal Girls

Received Dec 10, 1999; accepted Apr 25, 2000.

Margarita S. Treuth, Nancy F. Butte, Maurice Puyau, and Anne Adolph

From the US Department of Agriculture/Agricultural Research Service Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas; and Center for Human Nutrition, Johns Hopkins University, Baltimore, Maryland.

Objective.  To determine whether physical activity and fitness differ among normal-weight-for-height, multiethnic, prepubertal girls whose parents are lean, obese, or both.

Setting.  Conducted in Houston, Texas.

Study Participants.  Normal-weight white, black, and Hispanic prepubertal girls (mean age ± standard deviation: 8.5 ± .4 years) participated in this study. Girls were recruited according to parental leanness or obesity defined as follows: girls with 2 lean parents (LN group; n = 30); girls with 2 obese parents (OB group; n = 27); and girls with 1 lean and 1 obese parent (LNOB group; n = 44).

Intervention.  Each child wore a heart rate monitor for two 24-hour periods, underwent a treadmill exercise test, answered an activity questionnaire, and completed energy expenditure measurements by basal calorimetry and doubly labeled water.

Outcome Measures.  The amount of time spent above 125% and 150% of basal heart rate (BHR) was calculated during each 24-hour period (n = 84). Fitness (n = 97), habitual physical activity (n = 101), and physical activity level (PAL = total energy expenditure/basal metabolic rate; n = 101) were also measured.

Results.  The times spent above 125% and 150% of BHR were similar among LN, LNOB, and OB groups. Black girls spent less time than did white girls on the weekend above 125% BHR and above 150% BHR. No significant familial or ethnic differences in peak oxygen consumption or habitual physical activity were observed. PALs were as follows: LN = 1.6 ± .21; LNOB = 1.64 ± .27; OB = 1.58 ± .20; white = 1.63 ± .23; black = 1.58 ± .24; and Hispanic = 1.65 ± .25. PAL was related to time spent above 125% BHR and 150% BHR (r = .31,.39).

Conclusions.  Physical activity and fitness of normal-weight prepubertal girls predisposed to obesity did not differ from girls without a family history of obesity. obesity, children, energy metabolism, exercise, heart rate monitoring. .


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