Body Composition, Circuit-based High Intensity Interval Training, Habitual Physical Activity, Performance, Resting Metabolic Rate
Conditions
Brief summary
In this study the investigators utilized a novel hybrid HIIT (high intensity interval training) exercise training approach, the Hybrid Interval Training (DoIT) workout that combines interval training, resistance exercise training and functional training in order to test the hypothesis that DoIT will be able to: i) reduce body mass, ii) improve body composition and iii) alter energy balance, of previously inactive, overweight/obese women.
Detailed description
In a controlled randomized, two-group, repeated measures design, 65 healthy, sedentary, premenopausal overweight or obese women were randomly assigned to one of three groups: (a) a control group (C, N=21) that participated only in measurements, (b) a training group (TR, N=14) that participated in a supervised 40-week DoIT workout exercise training program and (c) a training-detraining group (TRD, N=14). During the first 20 weeks, TR and TRD followed exactly the same training protocol. At the end of this period, TR continued training for 20 more weeks whereas TRD terminated training for 20 weeks (detraining). Anthropometric, metabolic, daily nutritional intake, habitual physical activity and performance measurements were performed in all groups at baseline, at 20 weeks and 40 weeks.
Interventions
BEHAVIORALDoIT workout
A hybrid small-group (5-10 women/session) training modality, that combines interval training, resistance exercise and functional training and performed according to a periodized model of exercise prescription as an alternative approach for weight management. FFIT was performed 3 times/week with 48 hours recovery between sessions for 40 weeks.
BEHAVIORALDoIT workout - Detraining
A hybrid small-group (5-10 women/session) training modality, that combines interval training, resistance exercise and functional training, performed according to a periodized model of exercise prescription for a 20-week period (3 times/week). Immediately after a 20-week detraining period (no training was performed) was followed.
BEHAVIORALControl - No training
No training was performed during a 40-week period. Participation only in measurements.
Sponsors
University of Thessaly
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
FEMALE
Age
30 Years to 45 Years
Healthy volunteers
Yes
Inclusion criteria
* (a) were sedentary (\<7,500 steps/day; VO2max \<30 ml/kg/min), b) premenopausal women aged 30-45 years, c) were overweight or obese class 1 (BMI=25-34.9 kg/m2), d) were non-smokers for ≥6 months before the study, e) not following a diet intervention or using nutritional supplements/medications before (≥6 months) and during the study, f) had no weight loss greater \>10% of body mass ≤6 months before the study, g) participated in ≥80% of total exercise sessions, and h) had no symptoms of depression.
Exclusion criteria
* a) a recent febrile illness, b) history of muscle lesion, c) lower limb trauma, d) signs, symptoms or diagnosis of serious health complications or physical disability or other medical condition compromising safe participation in exercise training.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in fat-free mass | At baseline, at 20 weeks and at 40 weeks. | Fat-free mass assessed by whole-body dual-energy X-ray absorptiometry (DXA). |
| Change in waist circumference | At baseline, at 20 weeks and at 40 weeks. | — |
| Change in hip circumference | At baseline, at 20 weeks and at 40 weeks. | — |
| Change in waist-to-hip ratio | At baseline, at 20 weeks and at 40 weeks. | — |
| Change in body fat. | At baseline, at 20 weeks and at 40 weeks. | Body fat assessed by whole-body dual-energy X-ray absorptiometry (DXA). |
| Change in fat mass | At baseline, at 20 weeks and at 40 weeks. | Fat mass assessed by whole-body dual-energy X-ray absorptiometry (DXA). |
| Change in resting metabolic rate | At baseline, at 20 weeks and at 40 weeks. | Measured using a portable open-circuit indirect calorimeter with a ventilated hood system. |
| Change in exercise-induced caloric expenditure. | At baseline, at 20 weeks and at 40 weeks. | Measured using a portable indirect calorimetry system |
| Change in body mass | At baseline, at 20 weeks and at 40 weeks. | — |
| Change in body mass index | At baseline, at 20 weeks and at 40 weeks. | — |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change in maximal oxygen consumption (VO2max) | At baseline, at 20 weeks and at 40 weeks. | Assessed by a portable open-circuit spirometry system. |
| Change in blood lactate concentration | Pre-exercise, during the exercise and post-exercise at baseline, at 20 weeks and at 40 weeks. | — |
| Change in habitual physical activity | At baseline, at 20 weeks and at 40 weeks. | Seven-day habitual physical activity was assessed by accelerometry |
| Change in dietary intake | At baseline, at 20 weeks and at 40 weeks. | Assessed using 7-day diet recalls |
| Change in maximal strength (1RM) | At baseline, at 20 weeks and at 40 weeks. | Measured bilaterally on a horizontal leg press. |
Countries
Greece
Outcome results
None listed