Table 2.

Concentration of guanine nucleotides (GTP, GDP, GMP) and pyridine nucleotides (NAD, NADP) in red blood cells before exercise, after exercise and 30 min of recovery

	Before exercise	After exercise	30 min of recovery
GTP (μmol/l RBC)	66.80 ± 8.25	65.27 ± 7.41	63.01 ± 8.02
GDP (μmol/l RBC)	28.02 ± 4.55	29.04 ± 6.23	28.42 ± 6.67
GMP (μmol/l RBC)	41.46 ± 6.29	39.53 ± 6.23	41.08 ± 6.31
TGN (μmol/l RBC)	133.84 ± 12.26	133.66 ± 10.07	132.49 ± 12.76
GEC	0.58 ± 0.03	0.59 ± 0.03	0.58 ± 0.03
NAD (μmol/l RBC)	72.84 ± 7.13	72.88 ± 9.55	71.77 ± 8.36
NADP (μmol/l RBC)	45.80 ± 4.53	45.18 ± 3.40	44.89 ± 3.80

Concentrations of GTP, GDP, GMP, TGN, NAD, NADP are expressed as μmol/l RBC

Values are given as mean ± SD; n = 22

TGN (total guanine nucleotides) = [GTP] + [GDP] + [GMP]

GEC (guanylate energy charge) was evaluated according to the formula by Atkinson

GEC = ([GTP] + 0.5[GDP])/([GTP] + [GDP] + [GMP])