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ENERGY COST OF RESISTANCE TRAINING IN OBESE, PRE-DIABETIC, POSTMENOPAUSAL WOMEN.

Abstract

BACKGROUND: Energy expenditure (EE) from exercise is a minor but important consideration in the context of total daily energy demands and plays a role in weight management strategies. This has not been well characterized for resistance training (RT). The purpose of this study was to measure the EE of RT in post-menopausal, pre-diabetic, obese women. Understanding the energy cost of RT in this population will provide valuable to inform health professionals aiming to understand overall energy demands of RT and the application to weight management. METHODS: Nine pre-diabetic, postmenopausal women (50-70 years old, 96.4 ±7.9 kg) completed the resistance training (RT) portion of a larger study approved by FSU Human Subjects Committee. Participant screenings prior to RT excluded those with a blood pressure >140/90 mmHg; type I or type II diabetes; medical contraindications to exercise; recent musculoskeletal disease or injury (<6 months); history of, or current cancer, CVD, respiratory disease, uncontrolled thyroid dysfunction, liver or renal dysfunction; use of tobacco products or medications affecting lipid metabolism; and/or diagnosis with an eating disorder. Participants needed to have a Body Mass Index of 30-39.9 kg/m2, a waist circumference > 88.0 cm, meet at least one criterion of prediabetes (HbA1c 5.7 - 6.4%, fasting blood glucose 100-125 mL/dL, and/or 2-hr OGTT blood glucose 140-199 mg/dL), and be sedentary with a stable bodyweight (< ±2 kg in preceding 6 months). RT involved a circuit of seven machine-based resistance exercises: chest press, horizontal leg press, cable seated row, quad extension, shoulder press, seated hamstring curl, and cable biceps curl. A 10-repetition maximum lift (10RM) was tested for all exercises one week prior to RT. The participants lifted their 10RM for all sets of all exercises. Metabolic rate was measured using a metabolic cart during RT. Each RT session ended when the subject expended 200 kcal. The first ten and final six minutes were discarded from the data set when calculating average EE. RESULTS: The average EE in the RT group was 1.47± 0.33 kcal/min. Interestingly, the EE did not significantly correlate with participant’s bodyweight (r = 0.37, p=0.32), weekly training load (r = 0.10, p = 0.80), or relative strength (r = 0.02, p=0.97). CONCLUSIONS: The results suggest that the EE of post-menopausal, pre-diabetic, obese women during RT is 1.47± 0.33 kcal/min. Grant or funding information: 1 R01 DK125728-01.

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