Table 1.

Comparison of the mean (±SD) values of nitric oxide in short and prolonged exercise to that of control subjects

Subjects	N	Nitric oxide (μmol/l)
Controls	19	46.6 ± 6.1
Moderate exercise	19	48.3 ± 6.0
Prolonged exercise	19	43.7 ± 1.0
t-test, P valuea	0.866, P> 0.20
t-test, P valueb	2.045, P< 0.05*
t-test, P valuec	2.362, P< 0.05*

Index: a – Controls compared with moderate exercise; b – Controls compared with prolonged exercise; c – Short exercise compared with prolonged exercise; * - Significantly different