Increased level of cardiorespiratory fitness blunts the inflammatory response in metabolic syndrome.
OBJECTIVE
The presence of metabolic syndrome is associated with a higher degree of inflammation. We sought to assess whether the higher levels of cardiorespiratory fitness attenuate the levels of inflammation in people with metabolic syndrome.


METHODS
We studied 449 consecutive asymptomatic men (47+/-7 years) who underwent a maximal treadmill exercise test according to the Bruce protocol. Cardiorespiratory fitness was divided into tertiles based on metabolic equivalents (METs). White blood cells (WBC) (x10(9) cells/L) count was used as marker of inflammation.


RESULTS
In our study population, 23% of the participants had the metabolic syndrome. The WBC count increased (p < 0.0001 for trend) with increasing number of risk factors for metabolic syndrome; however there was an inverse relationship (p < 0.0001 for trend) with increasing tertiles of fitness (6.47 cells x 10(9) cells/L for lowest tertile and 5.7 x 10(9) cells/L for highest tertile). Multiple linear regression analyses demonstrated that as compared to individuals with no MS risk factor, the WBC count remained significantly higher in men with metabolic syndrome in first tertile (regression coefficient: 1.2, 95% CI 0.4-2.0, p = 0.003) and second tertile (regression coefficient: 0.61, 95% CI 0.4-2.0, p = 0.02) of cardiorespiratory fitness, respectively. However, in the highest tertile of fitness no increase in level of WBC count was observed with increasing metabolic syndrome risk factors.


CONCLUSIONS
Our findings suggest that in people with metabolic syndrome an increased level of physical fitness might exert its beneficial effect via attenuating inflammation.
Rana
Jamal S
JS
Department of Medicine, University of Pittsburgh, PA 15213, USA.
Nasir
Khurram
K
Santos
Raul D
RD
Roguin
Ariel
A
Orakzai
Sarwar H
SH
Carvalho
Jose A M
JA
Meneghello
Romeu
R
Blumenthal
Roger S
RS
D000328:Adult; D000368:Aged; D000886:Anthropometry; D015415:Biomarkers / Q000097:blood; D002320:Cardiovascular Physiological Phenomena; D015444:Exercise; D005080:Exercise Test; D006801:Humans; D007249:Inflammation / Q000097:blood*; D007958:Leukocyte Count; D007962:Leukocytes / Q000166:cytology; D008297:Male; D024821:Metabolic Syndrome / Q000503:physiopathology*; D008875:Middle Aged; D010809:Physical Fitness; D012307:Risk Factors; D044465:White People / Q000706:statistics & numerical data
D015415:Biomarkers