Blood samples (10 ml) were taken within two minutes of each
postexercise recording and analysed by gas-liquid chromatography
with electron capture detection (atenolol4; metoprolol5).
Data on heart rate and systolic and diastolic pressures in the
different positions were analysed by analyses of variance. Because
of interactions separate analyses of variance were then computed for
elapsed times of four, 12, and 24 hours. Pairs of means were compared
by Scheffe's method, which adjusts significance levels to allow for
multiple comparisons, and the results confirmed using Wilcoxon's
signed rank test, which requires less stringent assumptions regarding
the type of measurements being made.