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Variability of exercise performance during long‐term placebo treatment
Author(s) -
McGraw Benjamin F,
Hemberger Judith A,
Smith Arthur L,
Schroeder John S
Publication year - 1981
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1981.167
Subject(s) - placebo , heart rate , medicine , bruce protocol , treadmill , angina , cardiology , anesthesia , stress testing (software) , physical therapy , myocardial infarction , blood pressure , alternative medicine , pathology , computer science , programming language
Although exercise testing is commonly used to determine the efficacy of antianginal drugs, there is little information on the effect of frequent exposure to such testing over periods as long as 6 mo. In our study 10 patients (four men and six women) with stable angina pectoris received placebo for 6 mo. Treadmill testing followed a modified Bruce protocol. All patients exercised to an end point of typical anginal pain and 1 mm or more of ST depression. The first treadmill test for diagnostic purposes was followed by testing every 2 wk for 6 mo. Sublingual nitroglycerin was permitted to abort attacks of angina. Parameters evaluated included heart rate, double product, and duration of exercise. There was no change in the maximal heart rate ( x = 109 at 2 wk and 112 at 6 mo) or double product ( x = 17,002 at 2 wk and 17,249 at 6 mo). On the other hand, duration increased ( x 7.8 min at two wk and 9.9 min at 6 mo). Thus, although treadmill testing showed reproducible measurements of maximal heart rate and double product over 6 mo, exercise duration increased progressively. Clinical Pharmacology and Therapeutics (1981) 30 , 321–327; doi: 10.1038/clpt.1981.167