A long-term training program was performed on 30 chronic hypertensive female patients, stages I-II, WHO criteria. The effect on blood pressure (BP) and other physiological parameters, as exercise BP, heart rate, physical working capacity, VO<sub>2</sub><sub>max</sub>, double product, were studied. Four phases were outlined throughout the trial: (1)3 months training at 70% of the maximal heart rate; (2) 3 months without training; (3) 1 year training at the same level as phase I, and (4) 12 or more months with increasing intensity training over 70 % of the maximal heart rate. Serial ergometric work tests were performed every 3 months.We observed a close relationship between physical working capacity and VO<sub>2</sub><sub>max</sub> increases with training intensity. Resting BP fell significantly with training (182/114-161/97 mm Hg; p < 0.001) but increased again when training was discontinued (161/97-179/115 mm Hg; p < 0.001). BP persisted low throughout the trial, but there was a tendency to a further but not significant decrease when training intensity was raised over 70% of the maximal heart rate. Both the submaximal and maxima
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