Kardiovaskuläre und metabolische beanspruchung durch einen kraftausdauer-zirkel in der ambulanten herztherapie

This sludy investigated the practicability as well as the cardiocirculatory and metabolic reactions to a strength-endurance circuit training (SET) in gymnasium without machines by members of an outpatient cardiac group. Eleven male normotensive coronary patients (age 53 + 9 years, maximal performance during bicycle ergometry 2.14 + 0.36 W . kg -1 body mass) performed two circles of six exercises of the muscle groups shoulder, arms, back, abdomen and legs. The exercise and recovery period lasted one minute each involving 20 - 30 repetitions per exercise. In addition, the subjects performed a bicycle ergometry (CE) in upright position. Three patients showed ischacmic reactions in the monitoring-ECG, one patient complained of mild angina pectoris, and in one patient frequent ectopic beats were recorded during SET. Heart rate (107 ± 9 beats :min^-1), blood pressure (measured immediately after exercise according to Riva-Rocci and thus with limited validity; 144 ±11 / 84 ± 5 mmHg) as well as the plasma concentrations of free epinephrine and norepinephrine were significantly lower during SET compared to the endurance threshold (corresponding to the intensity of the upper training heart rate) in CE (115 ± 11:min^-1 and 172 ± 16/ 88 ± 9 mmHg). The blood lactate concentration was higher during SET compared to the endurance threshold in CE (3.00 ± 0.59 versus 2.74 ± 0.25 mmol-l^-1). The heart rate as well as the concentrations of lactate, epinephrine and norepinephrine increased progressively during SET. The subjective rating of perceived exertion did not correspond to the actual cardiac strain. It is concluded that if certain prerequisites are met, an individually controlled and supervised strength-endurance circuit training can be a suitable training modus in addition to the usual cardiac rehabilitation program in normotensive patients of the outpatient heart group.