An observational study in Obesity and Healthy, sponsored by Hacettepe University. Completed at 1 site in Turkey. Open to female participants aged 25 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-07-01.
Sponsored by Hacettepe University · Observational
The aim of this study is to investigate the relationship between physical activity levels, dietary patterns with fat oxidation at rest in normal lean individuals and those with overweight and obese.
Obesity is associated with a changing food environment where low-cost, high-energy-dense fast foods are readily available, and physical activity levels are decreasing. Additionally, metabolic flexibility, defined as the organisms ability to switch between metabolic fuels, is impaired in obesity and is known to play a significant role in the development of chronic diseases. In these disease states, a metabolically inflexible condition is typically characterized by a reduced ability to regulate fat oxidation during fasting and carbohydrate oxidation during satiety. Therefore, considering the rising trend in obesity, understanding the factors related to metabolic flexibility becomes critical. It is known that numerous factors such as diet composition, eating habits, physical activity level, and sedentary behavior affect metabolic flexibility. However, unlike dietary and exercise interventions, the number of studies examining the impact of individuals eating habits and physical activity levels on resting fat oxidation is limited, and this topic has not yet been researched in obese individuals.
Moreover, another important concept known to have adverse effects on metabolic health independently of physical inactivity is sedentary behavior. Sedentary behavior is defined as "activities that require low energy expenditure while sitting, reclining, or lying down." However, the extent to which daily sedentary time and interruptions of this time with physical activities affect resting fat oxidation, an important variable of metabolic health, is not known.
In this context, the aim of this study is to comparatively determine the relationship between physical activity levels, sedentary behaviors, habitual diet, and resting fat oxidation in normal-weight and overweight/obese women. A total of 118 healthy women aged 25-50 years (normal weight, n=60; body mass index (BMI) = 18.5 - 24.9 kg/m²) and overweight/obese (n=60; BMI = 25.0 - 34.9 kg/m²) will participate in this study. All participants' body composition and resting metabolic rate measurements will be conducted, and fat and carbohydrate oxidation will be determined. The dietary habits, 4-day physical activity levels, and sedentary behaviors of all participants will be assessed using appropriate measurement methods.
The findings of this project are expected to reveal the extent to which dietary habits, physical activity, and sedentary behavior throughout the day affect resting fat oxidation in overweight/obese and normal-weight individuals. These findings will provide important evidence on how dietary habits and sedentary behaviors can improve resting fat oxidation, an important indicator of metabolic flexibility, without the need for dietary and exercise interventions
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This study's enrollment of 120 is below the median of 135 across 1,283 observational studies indexed under Obesity.
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Sedentary women aged 25 to 50 with a body mass index range of 18.5-24.9 kg/m2 (normal weight; control group) and 25-34.9 kg/m2 (overweight and obese; research group) will be included in the study.
Sedentary women aged 25-50 years with a body mass index range of 18.5-24.9 kg/m2 (normal weight) and 25-34.9 kg/m2 (overweight and obese) will be included in the study.
Exclusion Criteria:
Healthy women with overweight and women without any chronic conditions other than obesity In this cross-sectional study, indirect calorimetry will be used to determine resting fat oxidation in these participants. Subsequently, the relationship between the resting fat oxidation data obtained with the habitual diet and physical activity status of these participants will be evaluated. Dietary patterns and physical activity will be assessed with 4 consecutive daily food consumption records and Actigraph GT3X+ devices, respectively.
Healthy women with normal weight. In this cross-sectional study, indirect calorimetry will be used to determine resting fat oxidation in these participants. Thus, resting fat oxidation data of healthy women with normal weight and women with obesity/overweight will be compared. Subsequently, the relationship between the resting fat oxidation data obtained with the habitual diet and physical activity status of these participants will be evaluated. Dietary patterns and physical activity will be assessed with 4 consecutive daily food consumption records and Actigraph GT3X+ devices, respectively.
Resting fat oxidation
In order to determine the relationship of dietary habits and habitual physical activity levels with resting fat oxidation in healthy overweight, obese and normal weight individuals, resting fat oxidation measurements will be performed with a indirect calorimetry (Cardio Pulmonary Exercise Testing, Quark CPET, Italy).All resting fat oxidation tests will be conducted in the same quiet room under a controlled ambient temperature (22-24 °C) and humidity (35-45%). Subjects will be instructed to arrive at the laboratory at 8 a.m. by car or by bus (avoiding any physical activity after waking up) and having fasted for at least 10-12 hours. In addition to this, they will be advised to avoid any moderate physical activity for the 24 h before the test day or any vigorous intensity exercise in the prior 48 h.
Time frame: From July 2024 to October 2024
The relationship between habitual physical activity level and sedentary behaviour with resting fat oxidation
Participants' habitual physical activity and sedentary behaviour will be measured with an accelerometer (Actigraph, USA) for 4 consecutive days to determine the relationship with resting fat oxidation.
Time frame: July 2024- October 2024
Dietary pattern and fat oxidation
In order to determine the relationship of macronutrient intake and food group consumption with resting fat oxidation, 4-day food consumption records will be obtained from the participants.
Time frame: July 2024- October 2024
Plan to share: No — I can share my data when requested after the study is published.
This study is completed, as verified in Jun 2024. You cannot join it, but the record below documents what was studied.
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Hacettepe University