It has been suggested that weight loss and regain, known as weight cycling, may result in greater body fatness and increased upper body fat distribution which may lead to adverse health consequences. These are concerns that may discourage some obese women from undergoing weight loss efforts. We retested 44 obese women, who took part in one of two weight control studies conducted in our laboratory, at either 6 or 12 months posttreatment. The followup study was performed to determine whether percent body fat and waist/hip ratio (WHR) had increased in those subjects who failed to maintain their weight loss. Subjects lost (mean + SD) 8.6 + 1.2 kg body weight, of which 7.0 + 1.0 kg was fat, and reduced their WHR by 0.03 + 0.006 (all p’s < .01) after either 12 or 16 weeks of treatment comprised of eating a low-fat diet, and in most cases performing endurance exercise training. At followup subjects were divided into groups based on the amount of weight regained. Those who regained (n=19) their lost weight were not fatter nor was their WHR higher than before the study began. These results do not support claims that weight cycling, in this case a single cycle, increases overall percentage of body fat or causes a redistribution of fat to the abdominal region of women.
Roger L. Hammer, Daryl McCombs and A. Garth Fisher
Brian R. Hunt, James D. George, Pat R. Vehrs, A. Garth Fisher and Gilbert W. Fellingham
The purpose of this study was to validate the ability of the 1-mile jog test to predict VO2max in fit teenagers. Forty-one males and 42 females performed the steady-state, submaximal jogging test on an indoor track, along with a maximal graded exercise test (GXT) on a treadmill. Open circuit calorimetry was used during the GXT to measure maximal oxygen consumption (VO2max). We generated the following age-specific prediction equation applicable to boys and girls 13–17 years old (n = 83, Radj = .88, SEE = 3.26 ml · kg−1 · min−1): VO2max = 92.91 + 6.50 × gender (0 = female, 1 = male) − 0.141 × body mass (kg) − 1.562 × jog time (min) − 0.125 × heart rate (bpm). Cross-validation results were acceptable (SEEpress = 3.44 ml · kg−1 · min−1). As a field test, the submaximal 1-mile jogging test may alleviate problems associated with pacing, motivation, discouragement, injury, and fatigue that are sometimes associated with maximal effort timed or distance run tests.