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(a) The basal blood pressure (mmHg) in control (■) and exercising (□) animals. Data are expressed as means ± S.E.M., n = 14–18. (b) The effect of recreational physical exercise on ST segment changes (measured in a lead II standard surface ECG; expressed in mV) following intravenous injection of epinephrine (10.0 μg/kg) and 30 s later phentolamine (15.0 mg/kg). Data are shown as means ± S.E.M, n = 14–18. Statistical significance: *** P < 0.001 as compared with the control group.
