TY - JOUR
T1 - Change and secular trends in physical activity patterns in young adults
T2 - A seven-year longitudinal follow-up in the Coronary Artery Risk Development in Young Adults study (CARDIA)
AU - Anderssen, Norman
AU - Jacobs, David R.
AU - Sidney, Stephen
AU - Bild, Diane E.
AU - Sternfeld, Barbara
AU - Slattery, Martha L.
AU - Hannan, Peter
N1 - Funding Information:
This work was supported by contracts N01-HC-48047, N01-HCM8048, N01-HCM8049, and N01-HC-48050 from the National Heart, Lung, and Blood Institute.
PY - 1996/2/15
Y1 - 1996/2/15
N2 - Levels and changes in self-reported physical activity over a 7-year period were examined to determine tracking and to estimate the proportion of total cohort change attributable to secular trends. A population-based sample of 2,328 men and 2,787 women aged 18-30 years at baseline (52% black and 48% white) from Birmingham, Alabama, Chicago, Illinois, Minneapolis, Minnesota, and Oakland, California, were examined four times between 1985-1986 and 1992- 1993. The intraclass correlation for up to four measures was 0.57 for the entire sample, varying between 0.57 for white men and 0.42 for black women, indicating a moderate tendency for tracking. The energy expenditure in physical activity at each examination was greatest in black men and, compared with black men, about 5% less in white men, 30% less in white women, and 50% less in black women. The total cohort decrease in mean physical activity was approximately 30% in each race-sex group. The secular trend accounted for 38% of the total cohort change in black men, 43% in black women, 52% in white men, and 81% in white women. Physical activity declined sharply during the early years of adulthood, partly because of secular trend. Young adults are therefore an important target group for physical activity promotion programs to reverse individual and populationwide declines prior to middle age.
AB - Levels and changes in self-reported physical activity over a 7-year period were examined to determine tracking and to estimate the proportion of total cohort change attributable to secular trends. A population-based sample of 2,328 men and 2,787 women aged 18-30 years at baseline (52% black and 48% white) from Birmingham, Alabama, Chicago, Illinois, Minneapolis, Minnesota, and Oakland, California, were examined four times between 1985-1986 and 1992- 1993. The intraclass correlation for up to four measures was 0.57 for the entire sample, varying between 0.57 for white men and 0.42 for black women, indicating a moderate tendency for tracking. The energy expenditure in physical activity at each examination was greatest in black men and, compared with black men, about 5% less in white men, 30% less in white women, and 50% less in black women. The total cohort decrease in mean physical activity was approximately 30% in each race-sex group. The secular trend accounted for 38% of the total cohort change in black men, 43% in black women, 52% in white men, and 81% in white women. Physical activity declined sharply during the early years of adulthood, partly because of secular trend. Young adults are therefore an important target group for physical activity promotion programs to reverse individual and populationwide declines prior to middle age.
KW - exercise
KW - longitudinal studies
KW - racial stocks
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U2 - 10.1093/oxfordjournals.aje.a008749
DO - 10.1093/oxfordjournals.aje.a008749
M3 - Article
C2 - 8633619
AN - SCOPUS:0030043228
SN - 0002-9262
VL - 143
SP - 351
EP - 362
JO - American journal of epidemiology
JF - American journal of epidemiology
IS - 4
ER -