People overrate how hard they work out or underestimate what moderate intensity exercise means, according to a new Canadian study.
In the study by York University, 129 sedentary adults ages 18 to 64 years correctly estimated physical activities of light effort but underestimated moderate and vigorous effort, even after being given commonly used exercise intensity descriptors.
"Our study findings suggest that the majority of young and middle-aged to old adults underestimate the intensity of physical activity that is required to achieve health benefits," said Professor Jennifer Kuk, School of Kinesiology and Health Science.
"This is worrisome both for personal and public health and well-being," Kuk said.
"We instructed volunteers to walk or jog on the treadmill at a speed which they felt corresponded to the 'light', 'moderate' and 'vigorous' intensity descriptors used in the physical activity guide, yet they underestimated how hard they should be working to achieve moderate and vigorous intensity," said lead researcher and graduate student Karissa Canning.
Health Canada, as well as global physical activity guidelines using general terms to describe exercise intensity, recommend that adults ages 18 to 64 years should participate in two-and-a-half hours of moderate to vigorous physical activity per week for 10 minutes or longer at a stretch.
For adults to achieve a moderate intensity, their heart rates should be within the range of 64 to 76 per cent of their maximum heart rate and between 77 to 83 per cent for vigorous intensity, according to the Canadian and global physical activity guidelines.
Though there has been ample research that helped to develop the current guidelines, it is unclear whether individuals actually understand them as intended, Canning noted.
The study was published in the journal PLOS ONE.
