We invite women over 50 years of age to participate in a research project comparing the information obtained about energy and calorie expenditure from different physical activity monitors with that recorded by the gold standard doubly-labelled water.

 Volunteers will be fitted with 3 non-invasive activity monitors and be required to wear them for 14 days.  Participation in this study also involves the collection of several urine samples to evaluate daily energy expenditure.

 Feedback about your exercise intensity, physical activity levels and daily energy expenditure will be provided.