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Gomez-Conesa A1, Sánchez-Polo A2, De Llano Ormazabal E2
1University of Murcia, Department of Physical Therapy, Espinado-Murcia, Spain, 2Santa Ponsa Health Centre, Santa Ponça, Illes Balears, Spain
Background: Obesity is a chronic and progressive disease that limits physical activity. Physical exercise and a healthy diet are key for the treatment of overweightness and obesity, as well as decrease the risk of cardiovascular and metabolic diseases. Traditionally it was recommended to perform moderate-intensity continuous training (MICT) plus diet restriction but currently high-intensity interval training (HIIT) has become increasingly popular.
But up until now, has not yet been studied the effects of MICT, in termsof weight reduction, compared to moderate-intensity interval training (MIIT) in persons with obesity.
Purpose: To evaluate the effectiveness of combined diet restriction (1300-1400 kcal) and a MMIT or MMCT programme on weight loss and body mass index (BMI) in overweight and obese individuals.
Methods: Ninety nine patients (mean age of 49,26; 29 % men) that attended a private clinical participated in the study. The inclusion criteria were age >18 years, a BMI of 25-39.9 kg/m2 and signed the informed consent. If practiced sports or followed a diet during the last 6 months; affected by acute pathologies; diseases, surgical intervention or taking medication incompatible with exercise, were excluded.This study was approved by the Regional Clinical Research Ethical Committee.
In a triple-blinded clinical trial with intention-to-treat analysis, patients were randomized in two groups: MICT (n=56) and MIIT (n=43). Both groups performed 4 sessions per week during 12 weeks of exercise on a cycloergomete, as well as a 1,300-1,400 kcal restrictive diet. MICT group, with a 3 minute warm-up at 40 watts, 32 minutes at 60% VO2MAX (first month), 70% (second month), and 80%(third month), with a 3 minute cool-down period at 40 watts. MIIT group performed intervals; 4x4, at 60% VO2MAX (first month), 70% (second month), and 80% (third month) and active rests at 20 watts less than peak. All sessions were monitored by a physical therapist.
Both groups, were assessed in the same conditions, pre and post and at 8 weeks´ treatment, including caloric consumption, weight and height in order to obtain the BMI.
Stress tests were performed with a cycloergonometer using a 20-watt/minute incremental test until extenuation, reaching at least 85% theoretic maximum cardiac frequency, measured with a electrocardiograph and a ergospirometer or VO2MAX and maximum and resting heart rate.
Results: 85 patients completed the trial (MICT 48; MIIT 37).
Weight decreased in the MIIT group after 8 weeks (p=0.018], which was not observed at this time in MCIT. At 12 weeks, both groups had significantly lost weight (p=0.000), with no differences among them.
BMI values decreased in a similar fashion, being 2.45±2.43 kg/m2 (7.46%) lower in MCIT and 2.78±1.85 kg/m2 (8.49%) in MIIT.
Conclusion(s): Both MCIT and MIIT were shown to achieve weight loss, but MIIT reduced weight in less time, MIIT along with a 1300-1400 kcal diet is a more time-efficient approach to reduce body weight than MCIT.
Implications: MIIT along with a restrictive diet could be recommended as a weight-loss programme as it can achieve a ≥5% weight loss.
MIIT is more time-efficient since it allow a higher energy expenditure per sesión.
Keywords: Health promotion, High-intensity interval training, Obesity
Funding acknowledgements: It is not funding.
No acknowledgement is required.
But up until now, has not yet been studied the effects of MICT, in termsof weight reduction, compared to moderate-intensity interval training (MIIT) in persons with obesity.
Purpose: To evaluate the effectiveness of combined diet restriction (1300-1400 kcal) and a MMIT or MMCT programme on weight loss and body mass index (BMI) in overweight and obese individuals.
Methods: Ninety nine patients (mean age of 49,26; 29 % men) that attended a private clinical participated in the study. The inclusion criteria were age >18 years, a BMI of 25-39.9 kg/m2 and signed the informed consent. If practiced sports or followed a diet during the last 6 months; affected by acute pathologies; diseases, surgical intervention or taking medication incompatible with exercise, were excluded.This study was approved by the Regional Clinical Research Ethical Committee.
In a triple-blinded clinical trial with intention-to-treat analysis, patients were randomized in two groups: MICT (n=56) and MIIT (n=43). Both groups performed 4 sessions per week during 12 weeks of exercise on a cycloergomete, as well as a 1,300-1,400 kcal restrictive diet. MICT group, with a 3 minute warm-up at 40 watts, 32 minutes at 60% VO2MAX (first month), 70% (second month), and 80%(third month), with a 3 minute cool-down period at 40 watts. MIIT group performed intervals; 4x4, at 60% VO2MAX (first month), 70% (second month), and 80% (third month) and active rests at 20 watts less than peak. All sessions were monitored by a physical therapist.
Both groups, were assessed in the same conditions, pre and post and at 8 weeks´ treatment, including caloric consumption, weight and height in order to obtain the BMI.
Stress tests were performed with a cycloergonometer using a 20-watt/minute incremental test until extenuation, reaching at least 85% theoretic maximum cardiac frequency, measured with a electrocardiograph and a ergospirometer or VO2MAX and maximum and resting heart rate.
Results: 85 patients completed the trial (MICT 48; MIIT 37).
Weight decreased in the MIIT group after 8 weeks (p=0.018], which was not observed at this time in MCIT. At 12 weeks, both groups had significantly lost weight (p=0.000), with no differences among them.
BMI values decreased in a similar fashion, being 2.45±2.43 kg/m2 (7.46%) lower in MCIT and 2.78±1.85 kg/m2 (8.49%) in MIIT.
Conclusion(s): Both MCIT and MIIT were shown to achieve weight loss, but MIIT reduced weight in less time, MIIT along with a 1300-1400 kcal diet is a more time-efficient approach to reduce body weight than MCIT.
Implications: MIIT along with a restrictive diet could be recommended as a weight-loss programme as it can achieve a ≥5% weight loss.
MIIT is more time-efficient since it allow a higher energy expenditure per sesión.
Keywords: Health promotion, High-intensity interval training, Obesity
Funding acknowledgements: It is not funding.
No acknowledgement is required.
Topic: Non-communicable diseases (NCDs) & risk factors; Health promotion & wellbeing/healthy ageing
Ethics approval required: Yes
Institution: University of Murcia
Ethics committee: Clinical Research Ethical Committee
Ethics number: ID: 1123/2016
All authors, affiliations and abstracts have been published as submitted.
