This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 9/3/2009 1 Abnormal Responses to Exercise – Cardiovascular Diseases • 10 fold increase in VO 2 max in sedentary man may only be 6 in cardiac patient (~ 6 METs) • Diminished Q due to reduced SV and/or HR – Exertional hypotension – decreased contractile force of left ventricle – Chronotropic impairment – disease of SA or AV node – SxS (angina, dyspnea, claudication, etc.) – Medications may have significant effects on the exercise response Cardiac Disease and Exercise VO 2 = Q X a ‐ v O 2 difference Functional Capacity = HR x SV x a ‐ v O 2 diff • HR = age, beta blockade, sick sinus • SV = myocardial damage = contractility, aging • Arterial O 2 – anemia, smoking, COPD • Venous O 2 = deconditioning, aging • Coronary artery disease – – Peak METs = 6 – 9 – SxS = angina, shortness of breath, ECG abnormalities (ST segment depression) Abnormal Responses: CVD (con’t) • Congestive heart failure – – Peak METs = 3 ‐ 6 – Poor ventricular function (reduced SV) leading to reduced Q – SxS = dyspnea, blunted SBP responses, ECG abnormalities Abnormal Responses: Hypertension • Exercise testing strongly recommended for this population. However, may need additional Dxpopulation....
View Full Document
- Fall '11
- Harshad number, METS, Abnormal Responses