[Muscular isokinetic dynamometry].

In the past, muscular strength has primarily been measured using isometric, isotonic or tensiometric techniques. The advent of isokinetic dynamometers has supplied an objective method of measuring peak torque throughout a full range of motion at a predetermined speed of contraction. An isokinetic contraction is a refinement of the controlled motion concept.

Effects of nitrates on R-wave variations after exercise in coronary heart disease: differences in patients with and without angina pectoris.

With the purpose of investigating the pathophysiology of changes in the R wave after exercise and its relationship with left ventricular function, we studied 44 patients with coronary heart disease. They were classified into the following three groups: group A, 11 patients with angina pectoris and no prior myocardial infarction; group B, 18 patients with angina pectoris and prior myocardial infarction; and group C, 15 patients with prior myocardial infarction but no angina. All patients performed two exercise tests; one was a control test, and the other was performed after the sublingual administration of 5 mg of isosorbide dinitrate.