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Effect of long-term physical training on total red cell volume
Summary
Military training significantly increased total red cell volume (TRC) and maximal oxygen uptake (VO2max). These improvements were greater in individuals with lower initial levels and correlated with plasma volume changes, highlighting the impact of intense physical conditioning.
Area of Science:
- Sports Medicine
- Physiology
- Hematology
Background:
- Military training involves rigorous physical exertion.
- Understanding physiological adaptations to training is crucial for performance and health.
- Red blood cell volume and oxygen uptake are key indicators of aerobic fitness.
Purpose of the Study:
- To investigate the impact of a six-month military training program on total red cell volume (TRC) and predicted maximal oxygen uptake (VO2max).
- To explore the relationship between changes in TRC, VO2max, and plasma volume.
- To identify factors influencing these physiological adaptations.
Main Methods:
- Utilized the 51Cr-labelled red cell method to measure TRC.
- Assessed predicted maximal oxygen uptake (VO2max) before and after training.
- Compared physiological parameters between trained and sedentary groups.
- Analyzed correlations between TRC, VO2max, and plasma volume changes.
Main Results:
- A significant 4% mean increase in TRC was observed after six months of military training.
- Predicted VO2max increased by a mean of 16%, inversely related to initial levels.
- A strong positive correlation (r=0.59) was found between TRC and predicted VO2max.
- Significant correlation (r=0.62) observed between changes in TRC and estimated plasma volume.
Conclusions:
- Military training induces significant increases in total red cell volume and maximal oxygen uptake.
- Adaptations in TRC and VO2max are influenced by initial physiological status and training intensity.
- Plasma volume expansion is closely linked to the observed increase in red cell volume during intense training.