Cardiorespiratory fitness and C-reactive protein among a tri-ethnic sample of women.
BACKGROUND
Elevated C-reactive protein (CRP) is associated with increased coronary heart disease (CHD) risk. Cardiorespiratory fitness ("fitness") is related with lower CHD risk; however, its relationship with CRP is relatively unknown.


RESULTS
Cross-sectional associations between fitness and plasma CRP were examined among 135 African American (AA), Native American (NA), and Caucasian (CA) women (55+/-11 year; 28+/-6 kg/m2). Fitness was assessed with a maximal treadmill exercise test. Plasma CRP concentrations were determined with the Dade Behring high-sensitivity immunoassay. Geometric mean CRP levels were 0.43, 0.25, and 0.23 mg/dL, and average maximal MET levels of fitness were 7.2, 9.1, and 10 METs for AA, NA, and CA, respectively. CRP decreased across tertiles of fitness (P=0.002), increased across tertiles of BMI (P=0.0007), and varied by race (P=0.002). After adjustment for covariates, lower CRP (P<0.05) was observed across tertiles of fitness among NA and CA, but not AA. Among all women, after adjusting for race and covariates, the odds of high-risk CRP (>0.19 mg/dL) were 0.67 (95% CI=0.19 to 2.4) among fit (>6.5 METs) versus unfit women.


CONCLUSIONS
The health benefits from enhanced fitness may have an antiinflammatory mechanism.
LaMonte
Michael J
MJ
Cardiology Division, LDS Hospital, University of Utah School of Medicine, Salt Lake City, Utah 84143, USA. ldmlamon@ihc.com
Durstine
J Larry
JL
Yanowitz
Frank G
FG
Lim
Tobin
T
DuBose
Katrina D
KD
Davis
Paul
P
Ainsworth
Barbara E
BE
D044383:Black People; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000032:analysis*; D003327:Coronary Disease / Q000208:ethnology / Q000209:etiology; D003430:Cross-Sectional Studies; D005080:Exercise Test; D005260:Female; D006801:Humans; D007198:Indians, North American; D008875:Middle Aged; D010809:Physical Fitness; D012307:Risk Factors; D044465:White People; D001741:Black or African American
D002097:C-Reactive Protein