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Comparison of estimates of population levels of physical activity using two measures.

Abstract：

OBJECTIVE:To compare estimates of population levels of 'adequate activity' for health benefit in different age and sex groups using two different measures--kilocalories (kcals) and Mets.mins. METHODS:10,464 mid-age women (47-52 years) from the second survey of the Australian Longitudinal Study on Women's Health (ALSWH, 1998) and 2,500 men and women (18-75 years) from the 1997 Active Australia national survey, answered questions about physical activity. Kcals and Mets.mins were calculated from self-reported time spent in walking, moderate and vigorous activity, and self-reported body weight. 'Adequate activity' was defined as a minimum of 800 kcals or 600 Mets.mins. RESULTS:There were differences in the estimates of 'adequate activity' using the two methods among women participants in both surveys, but not among the male participants in the Active Australia survey. A significant proportion of the women in both surveys (6.4% of the ALSWH women and 8.5% of the Active Australia women, mean weight 60 kg) were classified as 'inactive' when the kcals method was used despite reporting levels of activity commensurate with good health. Fewer than 1% (mean weight 105 kg) were classified as 'active' using kcals when reporting lower than recommended levels of activity. Agreement between the two methods was better among men; only 3% were misclassified because of low or very high weight. CONCLUSIONS:The Mets.mins method of estimating 'adequate' activity assesses physical activity independently of body weight and is recommended for use in future population surveys, as it is less likely to under-estimate the prevalence of physical activity in women. IMPLICATIONS:Women and men aged 45-59 and women aged > 60 should be the target of specific health promotion strategies to increase population levels of physical activity.

journal_name

Aust N Z J Public Health

journal_title

Australian and New Zealand journal of public health

authors

Brown WJ,Bauman AE

doi

10.1111/j.1467-842x.2000.tb00503.x

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

520-5

issue

eissn

1326-0200

issn

1753-6405

journal_volume

pub_type

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Comparison of estimates of population levels of physical activity using two measures.