Women must be active 60 minutes a day minimum to keep the line
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WASHINGTON - The middle-aged women in good health and normal weight should have at least one hour per day of physical activity of moderate intensity to keep the line, according to a study published Tuesday in the United States.
- This research was conducted from 1992 to 2007 with 34,079 Americans with a normal diet, 54 years average age.
Earlier research and respectively after the third, sixth, eighth, tenth, twelfth and thirteenth year, these women expressed to the researchers their physical activity and weight.
The study authors analyzed the physical activity and weight change of participants every three years on average.
Among those who followed a normal diet, physical activity was associated with less weight gain during the thirteen years of study especially for those who already had a normal waist circumference in early research, highlight authors of these works, of the Brigham and Women's Hospital and the Faculty of Medicine at Harvard University in Boston (Massachusetts, north-east).
Their study appears in the Journal of the American Medical Association (JAMA) dated March 24.
Women took an average of 2.6 kilos during the thirteen years of study.
"There was a significant interaction between body mass index (BMI equals weight divided by the square of height editor's note) and the degree of physical activity among women with a BMI less than 25" researchers stress.
However, this relation of cause and effect was absent among participants whose BMI was above 25, thus stronger, they note.
A total of 4540 women or 13.3% of the total, whose BMI was below 25 at baseline, have managed to maintain their weight gain to less than 2.3 kg during the thirteen years monitoring.
The duration of their physical activities of moderate intensity during this period was 21.5 hours per week, about 60 minutes daily, say the authors of the research.
Ennaharonline/ M. O.
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