[Skip to Content]
Access to paid content on this site is currently suspended due to excessive activity being detected from your IP address 54.205.87.3. Please contact the publisher to request reinstatement.
[Skip to Content Landing]
Article
October 11, 1995

Exercise Intensity and Longevity in Men-Reply

Author Affiliations

Harvard School of Public Health Boston, Mass
Stanford University School of Medicine Stanford, Calif

JAMA. 1995;274(14):1132-1133. doi:10.1001/jama.1995.03530140044023

This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables.

Abstract

In Reply.  —Drs Pahor and Carbonin query our use of different classification criteria in analysis of physical activity and longevity in a cohort of Harvard alumni. We used three schemes for categorizing physical activity: (1) increments of 2100 kJ/wk; (2) quintiles of total energy expenditures (<2524, 2524 to <4738, 4738 to <8001, 8001 to <13142, and >13142 kJ/wk), and (3) five categories each of vigorous and nonvigorous energy expenditure, using identical cutoffs (<630, 630 to <1680, 1680 to <3150, 3150 to <6300, and >6300 kJ/wk). Since vigorous and nonvigorous energy expenditure add up to total energy expenditure, the cutoffs for category 3 are, of course, lower than those for category 2.Ideally, we would have used category 1 for all analyses; however, using increments of 2100 kJ/wk led to small numbers of deaths (<50) within some categories (Table 2). Thus, for age-adjusted analysis, stable estimates for mortality rates could be

First Page Preview View Large
First page PDF preview
First page PDF preview
×