BLOOD INDICES OF ENERGY METABOLISM AND MINERAL TURNOVER DURING BICYCLE ERGOMETRY OF UNTRAINED MEN AND TRAINED WEIGHTLIFTERS
Physical training is a critical element of preparation for orbital missions. Our work was aimed at comparative evaluation of human body adaptability to physical loading (bicycle ergometry, BE) based on the indices of energy metabolism (glucose, kreatine phosphokinase, lactate dehydrogenase, lactate) and mineral turnover (phosphorus, magnesium) in untrained male subjects (n = 10) and athletes (weightlifters, n = 10). Capillary blood from finger was analyzed with dry chemistry. Following the exercise, lactate concentrations grew high in the untrained subjects and moderately in weightlifters; lactate dehydrogenase was high in both groups. The exercise did not change phosphorus and magnesium levels in either group. The kreatine phosphokinase activity increased in the weightlifters and did not change in the untrained subjects. After BE, the untrained subjects were found to decrease glucose, whereas the weightlifters did not change this parameter. Conclusion: regular heavy physical loading has a negative effect on human body adaptability and should be taken into consideration in the process of pre-flight crew preparation.