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Home | Health | Morning Exercise Aids Weight Management Study Finds

Morning exercise aids weight management, study finds

The study examined if the daily rhythm of moderate to vigorous physical activity, measured using accelerometers, alters its relationship with obesity.

By ANI
Updated On - 23 September 2023, 11:30 AM
Morning exercise aids weight management, study finds
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Washington: Despite conflicting epidemiological results regarding the best time to exercise for weight loss, a study suggests that the best time of day to increase the relationship between daily moderate to vigorous physical activity and obesity is between the hours of 7 and 9 in the morning.

The study was published in Obesity, the premier magazine of The Obesity Society (TOS).

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Researchers investigated whether the diurnal pattern of accelerometer-measured moderate to vigorous physical activity changes the association between such human movement and obesity in the current study.

“Our study provided a novel tool to explore the diurnal pattern of physical activity and to investigate its impact on health outcomes,” said Tongyu Ma, PhD, assistant professor, Health Sciences Department, Franklin Pierce University, Rindge, N.H.; and the Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong, China. Ma is the corresponding author of the study.

Previous study has focused on the frequency, intensity, and duration of physical activity, according to experts. Few research has looked into the diurnal pattern of accelerometer-measured physical activity to classify the time of day when people move. It is unknown whether cumulative physical activity at various times of the day is similarly associated with obesity.

Furthermore, it is unclear if fulfilling the physical activity standards (150 minutes per week of moderate to vigorous physical activity) in various patterns is equally beneficial for reducing obesity.

Researchers used data from the 2003–2004 and 2005–2006 cycles of the National Health and Nutrition Examination Survey by the Centers for Disease Control and Prevention because accelerometry was implemented during that time. A total of 5,285 participants were cross-sectionally analyzed.

The diurnal pattern of objectively measured moderate to vigorous physical activity was classified into three categories by K-means clustering analysis: morning, mid-day and evening. K-means is an established algorithm that is commonly used to identify hidden patterns in unlabeled data sets.
Results revealed a strong linear association between moderate to vigorous physical activity and obesity in the morning group, whereas a weaker curvilinear connection was found in the midday and evening groups.

Participants who met the physical activity guidelines in the morning cluster had a lower body mass index and waist circumference than those in the other clusters. Self-reported dietary recall indicated that participants in the morning cluster had a healthier diet and less daily energy intake per unit of body weight compared with other clusters.

The study’s authors also found that participants in the morning cluster spent a significantly higher amount of time on sedentary behaviour than the participants in the other clusters. Despite the longer duration of sedentary time, the lower body mass index and waist circumference outcomes in the morning group persisted.

Overall, participants in the morning cluster were 10-to-13 years older than the two other groups. The morning cluster also had the highest percentage of female participants among the three groups. The majority of participants in the morning group were primarily non-Hispanic White, had a college or higher education, and had never used tobacco or alcohol.

“Our findings propose that the diurnal pattern of moderate to vigorous physical activity could be another important dimension to describe the complexity of human movement,” Ma and his colleagues stated in the study.

Rebecca Krukowski, PhD, a clinical psychologist with expertise in behavioural weight management, commented, “This is exciting new research that is consistent with a common tip for meeting exercise goals—that is, schedule exercise in the morning before emails, phone calls or meetings that might distract you.”

However, Krukowski said, since this is a cross-sectional study, “it is not known whether people who exercise consistently in the morning may be systematically different from those who exercise at other times, in ways that were not measured in this study. For example, people who exercise regularly in the morning could have more predictable schedules, such as being less likely to be shift workers or less likely to have caregiving responsibilities that impede morning exercise.

Predictable schedules could have other advantageous effects on the weight that were not measured in this study, such as with sleep length/quality and stress levels. In addition, the ‘morning larks’ who consistently rise early enough for morning exercise may be biologically different from their ‘night owl’ counterparts.”

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