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We therefore conclude that physical exercise with increasing or mostly anaerobic components leads to an increase in, the extent correlating with the degree of lactate concentration. Both in AnT and ST there was a relationship between the maximum concentrations of β-E and lactate ( r=0.63 and 0.71 each P<0.05). In AnT the increases of and demonstrated a correlation ( r= 0.65 P< 0.05). At all measuring times before and after ST and AnT both hormones correlated positively. During ST significant changes in and were measured only after exceeding TH an, i. The increased significantly only after ST. Both types of exercise led to significant increases in, , and, with levels of and approximately twice as high after ST as after AnT. Before, during and after ST, lactate concentration, heart rate and perceived degree of exertion were also determined after AnT maximum lactate concentration was measured.
In order to determine, adrenocorticotropic hormone, cortisol, adrenaline and noradrenaline concentrations, venous blood samples were collected prior and subsequent to exercise until the 20th min of the recovery period, as well as in ST before and after exceeding the individual anaerobic threshold (TH an, i).
Twelve non-specifically trained volunteers (aged 26.5 years, SD 3.6) performed exhausting incremental graded exercise (ST) and 1-min anaerobic cycle ergometer exercise (AnT) at 2-h intervals for the purpose of investigating β-endorphin (β-E) behaviour dependent on exercise intensity and anaerobic metabolism.