The devices measured the wearers’ energy expenditure and step count.
Researchers also measured participants’ weight, height and body fat. After an initial examination, participants were asked to return one year and two years later.
Surprisingly, total weight gain in every country was greater among participants who met the physical activity guidelines.
For example, American men who met the guidelines gained a half pound per year, while American men who did not meet the guideline lost 0.6 pounds.
The researchers did not find any significant relationships between sedentary time at the initial visit and subsequent weight gain or weight loss.
The only factors that were significantly associated with weight gain were weight at the initial visit, age and gender, the study said.