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April 24, 2013 – Boston, Massachusetts
Women who participate in a structured weight loss program with resistance-exercise experience more favorable changes in body composition when compared to other popular weight loss programs 127 sedentary women (46±12 yr, 45.5±5% body fat, 35.1±5 kg/m2) were randomized to participate in a control group (C) or the Curves Complete® program with online support (CC), Weight Watchers® Points Plus (WW), Jenny Craig® (JC), or Nutrisystem® Advance Select™ (NS) weight loss programs for 12-wks. Body mass, DEXA body composition, and resting energy expenditure (REE) measurements were obtained at 0, 4, 8, & 12 wks and analyzed by MANOVA. Data are presented as changes from baseline after 12-wks. Participants in the diet groups lost similar amounts of body mass (C 0.1±3.1; CC -6.1±3.2; WW -4.3±3.5; JC -5.3±3.8; NS -5.1±4.5 kg, p=0.001). However, participants in the CC group experienced significantly greater loss in fat mass (C -0.0±2.0; CC -5.2±2.8; WW -2.2±2.6; JC -3.5±3.3; NS -2.3±2.5 kg, p=0.001), less loss in FFM (C 0.1±2.3; CC -0.7±2.5; WW -1.8±2.3; JC -1.8±2.1; NS -2.4±2.2 kg, p=0.002), and greater reductions in percent body fat (C -0.1±1.7; CC -3.3±2.3; WW -0.6±2.5; JC -1.4±2.4; NS -0.2±1.7%, p=0.001). REE tended to differ among groups (C 39±190; CC 0±154; WW -108±159; JC -27±206; NS -43±206 kcal/d, p=0.07). Results indicate that participation in the CC program promotes more favorable changes in body composition than other popular weight loss programs.
Women who participate in a structured weight loss program with resistance-exercise experience more favorable changes in blood lipids when compared to other popular weight loss programs 123 sedentary women were randomized into a control group (C), Curves Complete® (CC), Weight Watchers® (WW), Jenny Craig® (JC), or Nutrisystem® (NS) weight loss program for 12-wks. Fasting blood samples were obtained at 0, 4, 8, & 12 wks. Data are percent changes from baseline. Significant group x time interactions were observed in TG (C -2.2±29, -7.7±26, 0.1±24; CC -27.1±21, -24.2±24, -23.2±20; WW -8.5±32, 1.6±36, -2.7±31; JC 3.3±40, 8.0±34, 15.1±43; NS 6.9±39, 11.2±33, 11.1±29 %, p=0.002) and HDL-c (C 0.6±11, -3.5±10; -5.0±10; CC -0.8±11, 0.3±11, 5.0±15; WW -5.1±12, -4.0±13, 0.2±14; JC -10.9±12, -6.4±14, -5.0±16; NS -6.2±14, -6.5±12, -4.0±13 %, p=0.01). Total CHL tended to differ among groups (C 0.6±12, -0.3±12; -2.2±11; CC -11.8±11, -9.1±9, -7.5±11; WW -5.8±12, -2.8±12, 0.6±12; JC -7.2±13, -3.3±13, -2.3±11; NS -4.9±13, -4.5±12, -3.8±16 %, p=0.07). No differences were observed among groups in LDL-c (C -1.9±18, 1.7±23; -4.0±17; CC -11.1±15, -9.2±13, -7.8±19; WW -1.4±20, 1.6±23, 10.4±51; JC -6.5±17, -1.7±17, -2.7±12; NS -4.6±18, -5.5±14, -6.1±21 %, p=0.21) or blood glucose (C 1.7±8, 2.6±6; -1.3±8; CC -2.2±10, -1.9±8, -2.4±12; WW -1.5±12, -1.1±9, -1.7±8; JC -3.3±9, -2.4±11, -1.6±10; NS -0.8±16, -3.2±14, -2.9±16 %, p=0.91). Results reveal a high protein/low fat weight loss program with resistance-training promotes more favorable changes in blood lipids compared to some other popular weight loss programs.
Effects of participation in popular weight loss and fitness programs on markers of health and fitness in women 125 sedentary women (46±12 yr, 45.5±5% body fat, 35.0±5 kg/m2) were randomized to participate in a control group (C) or urves Complete® (CC), Weight Watchers® (WW), Jenny Craig® (JC), or Nutrisystem® (NS) weight loss programs for 12-wks. Participants in the diet groups were encouraged to exercise (WW, JC, NS) while those in the CC group participated in a structured exercise program. Data were analyzed by MANOVA or ANOVA and are presented as changes from baseline after 12-wks. Participants in the diet groups had greater changes in waist (C 2.1±6.9; CC -4.7±3.2; WW -4.1±5.7; JC -3.7±3.6; NS -3.3±6.4 %, p=0.001) and hip circumference (C 0.7±2.5; CC -4.0±2.6; WW -2.5±2.4; JC -4.2±3.5; NS -3.6±3.5 %, p=0.001). Resting HR (-2.5±9 %, p=0.005) and SBP (-4.0±12 %, p=0.005) decreased over time with no change in DBP. SBP decreased more in some diet and exercise groups compared C (p<0.05). Changes in PAC (C -2.2±10; CC 14.4±10; WW 7.9±19; JC 8.1±11; NS 3.8±7 %, p=0.001) and 1 RM bench press (C -1.2±14; CC 6.0±12; WW 4.9±15; JC 5.4±14; NS -3.7±15 %, p=0.06). Results indicate diet and exercise programs promote improvements in fitness and the CC program promotes greater changes in aerobic capacity.
Effects of participation in popular weight loss and fitness programs on insulin and leptin in women 100 sedentary women (46±11 yr, 45.8±5% body fat, 35.2±5 kg/m2) were randomized to participate in a no diet or exercise control group (C) or the Curves Complete® 90-day Challenge (CC), Weight Watchers® Points Plus (WW), Jenny Craig® (JC), or Nutrisystem® Advance Select™ (NS) weight loss programs for 12-wks. Participants in the diet groups were encouraged to exercise (WW, JC, NS) while those in the CC group participated in a structured circuit-style resistance training (3 d/wk) and walking (3 d/wk) program. Fasting blood samples were obtained at 0, 4, 8, & 12 wks. Changes from baseline to 12-wks intervention for fasting insulin, the glucose to insulin ratio, homeostatic model assessment (HOMA), and leptin were analyzed by one-way ANOVA. Participants in the CC group tended to experience greater changes in fasting insulin (C 0.8±6.9; CC -7.5±14; WW -2.9±8.1; JC -3.8±6.3; NS -1.2±8.3 uIU/ml, p=0.10), the glucose to insulin ratio (C -1.3±4.1; CC 7.0±14; WW 3.3±5.4; JC 4.8±7.4; NS -6.0±21, p=0.01), HOMA (C 0.1±1.6; CC -2.3±4.4; WW -0.8±1.7; JC -1.0±1.9; NS -0.4±2.2, p=0.07) and leptin (C 4.3±16; CC -17.9±21; WW -13.0±16; JC -12.2±25; NS -3.5±26 ng/ml, p=0.03) compared to some of the other diet and exercise interventions. Results indicate that participation in different diet and exercise programs may have variable effects on markers of insulin resistance and leptin. |