Respiratory muscle strength and the risk of incident cardiovascular events

van der Palen, J.; Rea, T. D.; Manolio, T. A.; Lumley, T.; Newman, A. B.; Tracy, R. P.; Enright, P. L.; Psaly, B. M.
December 2004
Thorax;Dec2004, Vol. 59 Issue 12, p1063
Academic Journal
Background: Maximal inspiratory pressure (MIP) is a measure of inspiratory muscle strength. The prognostic importance of MIP for cardiovascular events among elderly community dwelling individuals is unknown. Diminished forced vital capacity (FVC) is a risk factor for cardiovascular events which remains largely unexplained. Methods: MIP was measured at the baseline examination of the Cardiovascular Health Study. Participants had to be free of prevalent congestive heart failure (CHF), myocardial infarction (MI), and stroke. Results: Subjects in the lowest quintile of MIP had a 1.5-fold increased risk of Ml (HR 1.48, 95% CI 1.07 to 2.06) and cardiovascular disease (CYD) death (HR 1.54, 95% Cl 1.09 to 2.15) after adjustment for non-pulmonary function covariates. There was a potential inverse relationship with stroke (HR 1.36, 95% Cl 0.97 to 1.90), but there was little evidence of an association between MIP and CHF (HR 1.22, 95% Cl 0.93 to 1.60). The addition of FVC to models attenuated the HR associated with MIP only modestly; similarly, addition of MIP attenuated the HR associated with FVC only modestly. Conclusions: A reduced MIP is an independent risk factor for MI and CYD death, and a suggestion of an increased risk for stroke. This association with MIP appeared to be mediated through mechanisms other than inflammation.


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