Figure 2

Relationships between age and the level of erythrocyte TAN, AEC, ATP/ADP, and ADP/AMP at rest (a, b, c, d) in endurance runners (open triangle, dashed lines; EN; n = 86), sprinters (filled square, solid lines; SP; n = 58) and controls (open circle, dotted lines; CO; n = 62). TAN total adenine nucleotides (calculated from formula: TAN = [ATP] + [ADP] + [AMP]), AEC adenylate energy charge (evaluated according to Atkinson’s formula: AEC = ([ATP] + 0.5[ADP])/([ATP] + [ADP] + [AMP])), ATP/ADP adenosine-5′-triphosphate/adenosine-5′-diphosphate ratio, ADP/AMP adenosine-5′-diphosphate/ adenosine-5′-monophosphate ratio, rest resting value.