title: Exercise intensity and longevity in men. The Harvard Alumni Health Study.
abstract: OBJECTIVE
  To examine the independent associations of vigorous (> or = 6 resting metabolic rate [MET] score) and nonvigorous (< 6 MET score) physical activity with longevity.
  
  
  METHODS
  Prospective cohort study, following up men from 1962 or 1966 through 1988.
  
  
  METHODS
  Subjects were Harvard University alumni, without self-reported, physician-diagnosed cardiovascular disease, cancer, or chronic obstructive pulmonary disease (n = 17,321). Men with a mean age of 46 years reported their physical activities on questionnaires at baseline.
  
  
  METHODS
  All-cause mortality (3728 deaths).
  
  
  RESULTS
  Total energy expenditure and energy expenditure from vigorous activities, but not energy expenditure from nonvigorous activities, related inversely to mortality. After adjustment for potential confounders, the relative risks of dying associated with increasing quintiles of total energy expenditure were 1.00 (referent), 0.94, 0.95, 0.91 and 0.91, respectively (P [trend] < .05). The relative risks of dying associated with less than 630, 630 to less than 1680, 1680 to less than 3150, 3150 to less than 6300, and 6300 or more kJ/wk expended on vigorous activities were 1.00 (referent), 0.88, 0.92, 0.87, and 0.87, respectively (P [trend] = .007). Corresponding relative risks for energy expended on nonvigorous activities were 1.00 (referent), 0.89, 1.00, 0.98, and 0.92, respectively (P [trend] = .36). Analyses of vigorous and nonvigorous activities were mutually adjusted. Among men who reported only vigorous activities (259 deaths), we observed decreasing age-standardized mortality rates with increasing activity (P = .05); among men who reported only nonvigorous activities (380 deaths), no trend was apparent (P = .99).
  
  
  CONCLUSIONS
  These data demonstrate a graded inverse relationship between total physical activity and mortality. Furthermore, vigorous activities but not nonvigorous activities were associated with longevity. These findings pertain only to all-cause mortality; nonvigorous exercise has been shown to benefit other aspects of health.
authors.affiliation: Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA.
authors.forename: I M
authors.initials: IM
authors.lastname: Lee
authors.forename: C C
authors.initials: CC
authors.lastname: Hsieh
authors.forename: R S
authors.initials: RS
authors.lastname: Paffenbarger
mesh_terms: D000328:Adult; D015331:Cohort Studies; D004734:Energy Metabolism; D015444:Exercise; D006801:Humans; D008136:Longevity; D008297:Male; D008875:Middle Aged; D009026:Mortality; D010809:Physical Fitness; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012044:Regression Analysis