Influence of symptom-limited stress on blood lactate behaviour in coronary heart disease (CHD) patients.
In order to document the possible influence of stress limiting factors (STLF: chest pain, ST-segment depression) on exercise-induced blood lactate increase in CHD patients (post myocardial infarction) 88 males were examined in a stepwise bicycle stress test. Blood lactate samples were drawn at the end of each stress step. The patients were divided into 2 groups without (n = 45) and with (n = 43) STLF, higher blood lactate concentrations, however, were only observed in relation to the exercise intensity reached at the end of the stress test. Neither the symptom chest pain nor the degree of ST-depression showed a significant influence on the physical performance capacity and the lactate concentration at the anaerobic threshold. Nevertheless, a physical performance capacity above 1 W/kg seems to be necessary to reach the anaerobic threshold level. When the lactate measurement is used in CHD patients, the influence of age on the maximum lactate concentrations must be considered.
Department of Sports Medicine, Centre of Internal Medicine, Freiburg, FRG.
A
A
Berg
M
M
Späth
L
L
Rokitzki
J
J
Staiger
J
J
Keul
D000368:Aged; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood*; D019344:Lactic Acid; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood / Q000150:complications / Q000503:physiopathology*; D010146:Pain / Q000209:etiology; D005082:Physical Exertion
D007773:Lactates; D019344:Lactic Acid