Michelle Mardock

Greater gains in strength and power with intraset rest intervals in hypertrophic training.

Abstract Oliver, JM, Jagim, AR, Sanchez, AC, Mardock, MA, Kelly, KA, Meredith, HJ, Smith, GL, Greenwood, M, Parker, JL, Riechman, SE, Fluckey, JD, Crouse, SF, and Kreider, RB. Greater gains in strength and power with intraset rest intervals in hypertrophic training. J Strength Cond Res 27(11): 3116–3131, 2013—We sought to determine if hypertrophic training with intraset rest intervals (ISRs) produced greater gains in power compared with traditional rest (TRD) hypertrophic training. Twenty-two men (age 25 ± 5 years, height 179.71 ± 5.04 cm, weight 82.1 ± 10.6 kg, 6.5 ± 4.5 years of training) matched according to baseline characteristics were assigned to 12 weeks of training using TRD or ISR. Body composition, strength (1-repetition maximum [1RM] bench and squat), and power output (60% 1RM bench and squat, and vertical jump) were assessed at baseline, 4, 8, and 12 weeks. Determination of myosin heavy chain (MHC) percentage from the vastus lateralis was performed pretraining and posttraining. Body composition was analyzed by analysis of variance, whereas performance measures and MHC were analyzed by analysis of covariance with baseline values as the covariate. Data are presented as mean ± SD changes pre to post. The ISR produced greater power output in bench (TRD 32.8 ± 53.4 W; ISR 83.0 ± 49.9 W, p = 0.020) and vertical jump (TRD 91.6 ± 59.8 W; ISR 147.7 ± 52.0 W; p = 0.036) with squat power approaching significance (TRD 204.9 ± 70.2 W; ISR 282.1 ± 104.2 W; p = 0.053) after post hoc analysis (p < 0.10). The ISR produced greater gains in bench (TRD 9.1 ± 3.7 kg; ISR 15.1 ± 8.3 kg; p = 0.010) and squat (TRD 48.5 ± 17.4 kg; ISR 63.8 ± 12.0 kg; p = 0.002) strength. Both protocols produced significant gains in lean mass with no significant differences between groups (1.6 ± 2.1 kg; p = 0.869). The MHCIIx percentage decreased (−31.0 ± 24.5%; p = 0.001), whereas the MHCIIA percentage increased (28.9 ± 28.5%; p = 0.001) with no significant differences between groups. Results indicate that hypertrophy training with ISR produces greater gains in strength and power, with similar gains in lean mass and MHC alterations as TRD. The ISR may be best used in hypertrophic training for strength and power sports.

Comparative effectiveness of two popular weight loss programs in women II: metabolic markers

Background A number of commercial diet and exercise programs are promoted to help people lose weight and improve fitness. However, few studies have compared the effects of following different types of exercise and diet interventions on weight loss. The purpose of this study was to compare the efficacy of a more structured meal plan based diet intervention and supervised exercise program that included resistance-exercise to a traditional point based diet program with weekly counseling and encouragement to exercise. Methods Fifty-one sedentary women (35±8 yrs, 163±7 cm; 90±14 kg; 47±7% body fat, 34±5 kg/m 2 ) were randomized to participate in the Curves (C) or Weight Watchers (W) weight loss programs for 16-weeks. Participants in the C program were instructed to follow a 1,200 kcal/d diet for 1-week, 1,500 kcal/d diet for 3-weeks, and 2,000 kcals/d diet for 2-weeks, consisting of 30% carbohydrate, 45% protein, and 30% fat. Subjects repeated this diet for the 16-week period. Subjects also participated in the Curves circuit style resistance training program 3-days/week and were encouraged to walk at a brisk pace for 30-minutes on non-training days. This program involved performing 30-60 seconds of bi-directional hydraulic-based resistance exercise on 13 machines interspersed with 30-60 seconds of low-impact callisthenic or Zumba dance exercise. Participants in the W group followed the W pointbased diet program, received weekly counseling at a local W facility, and were encouraged to increase physical activity. Fasting blood samples were obtained at 0, 4, 10, & 16 weeks and analyzed by multivariate analysis of variance (MANOVA) with repeated measures for changes in triglycerides (TG), total cholesterol (CHL), low density lipoprotein cholesterol (LDL-c), high density lipoprotein cholesterol (HDL-c), the CHL:HDL-C ratio, and blood glucose. Data are presented as percent changes from baseline for the C and W groups, respectively, after 4, 10, and 16 weeks. Results

Comparative effectiveness of two popular weight loss programs in women III: health and fitness markers

Background A number of commercial diet and exercise programs are promoted to help people lose weight and improve fitness. However, few studies have compared the effects of following different types of exercise and diet interventions on weight loss and/or changes in health and fitness markers. The purpose of this study was to compare the efficacy of a more structured meal plan based diet intervention and supervised exercise program that included resistance-exercise to a traditional point based diet program with weekly counseling and encouragement to increase physical activity.

Experiencing the impact of weight loss on work capacity prior to initiation of a weight loss program enhances success

Background A number of psychological interventions have been employed prior to and/or during exercise and weight loss interventions in an attempt to influence exercise adherence, compliance, and/or success. However, few studies have evaluated whether these types of efforts influence program efficacy. The purpose of this study was to determine whether having sedentary and overweight individuals experience the impact of losing weight on work capacity prior to initiation of an exercise and/or weight loss program would influence weight loss success.

Comparative effectiveness of two popular weight loss programs in women I: body composition and resting energy expenditure

Background A number of commercial diet and exercise programs are promoted to help people lose weight and improve fitness. However, few studies have compared the effects of following different types of exercise and diet interventions on weight loss. The purpose of this study was to compare the efficacy of a more structured meal plan based diet intervention and supervised exercise program to a traditional point based diet program with weekly counseling and encouragement to exercise.

Effectiveness of a dietary intervention on macronutrient intake, lean mass and strength gains in males participating in a supervised resistance training program

Background ISSN recommendations for individuals involved in a general fitness program are to ingest 25-35 kcal/kg/day consisting of 3-5 g/kg of carbohydrate and ≤30% of total calories from fat. Additionally, the ISSN recommends that individuals engaged in resistance-training should ingest 1.4-2.0 g/kg/d of protein and to ingest some protein after exercise. This study examined whether nutritional counseling and post-workout supplementation affects dietary intake during training.

Effects of high carbohydrate or high protein energy-restricted diets combined with resistance-exercise on weight loss and markers of health in women with serum triglyceride levels above or below median values

Effects of high carbohydrate or high protein energy-restricted diets combined with resistanceexercise on weight loss and markers of health in women with serum triglyceride levels above or below median values Jonathan M Oliver, Julie Y Kresta, Mike Byrd, Claire Canon, Michelle Mardock, Sunday Simbo, Peter Jung, Brittanie Lockard, Deepesh Khanna, Majid Koozehchian, Chris Rasmussen, Chad Kerksick, Richard Kreider

Macronutrient intake in Collegiate powerlifters participating in off season training

Background Currently, the ISSN recommends 50-80 kcal/kg/day for strength athletes participating in intense training. In addition to caloric recommendations, other macronutrient recommendations include protein, carbohydrate and fat, 1.5-2.0 g/kg bodyweight, 5-8 g/kg bodyweight, and 30% of total calories respectively. Athletes participating in collegiate club sports may not have the benefit of obtaining nutrition information from a designated coach or nutritionist; therefore, the purpose of this study was to determine the macronutrient intake of collegiate club sport powerlifters participating in intense off season training.

Comparative effectiveness of two popular weight loss programs in women IV: quality of life and diet satisfaction

Background A number of commercial diet and exercise programs are promoted to help people lose weight and improve fitness. However, few studies have compared the effects of following different types of exercise and diet interventions on weight loss, health, and quality of life. The purpose of this study was to compare the efficacy of a more structured meal plan based diet intervention and supervised exercise program that included resistance-exercise to a traditional point based diet program with weekly counseling and encouragement to exercise.

Effects of diet cycling on weight loss, fat loss and resting energy expenditure in women

Background The Curves fitness program involves a 30-minute circuit training program. Women interested in losing weight can also follow a weight management program. The most recent version of the weight management program involves cycling between periods of moderate calorie restriction (1,200 – 1,500 kcals/d) followed by periods of higher caloric intake (2,200 kcals/d) in an attempt to prevent long term reductions in resting energy expenditure (REE). The purpose of this preliminary study was to examine the efficacy of this exercise and diet cycling program approach on weight loss, fat loss, and REE.