Related Experiment Videos
Intravascular volume and protein responses to running exercise
Medicine and Science in Sports and Exercise
|June 1, 1984
Summary
Posture significantly impacts blood volume (BV) changes during exercise. While running and skin temperature have minimal effect on BV, the initial postural shift from sitting to standing causes a notable decrease, influencing exercise responses.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Physiology
Background:
- Understanding factors influencing blood volume (BV) and protein dynamics during exercise is crucial for sports science.
- Posture and thermal stress are potential modulators of physiological responses to physical activity.
Purpose of the Study:
- To investigate the roles of posture and mean skin temperature (Tsk) in determining intravascular volume and protein responses during running exercise.
- To elucidate the primary determinants of blood volume alterations in response to exercise.
Main Methods:
- Twelve healthy male subjects participated in the study.
- Measurements included hematocrit and hemoglobin concentration to assess blood volume changes.
- Subjects transitioned from sitting to standing positions before and during running exercise, with varying skin temperatures.
Main Results:
- A shift from sitting to standing consistently decreased blood volume (BV), evidenced by increased hematocrit and hemoglobin.
- Running onset and changes in mean skin temperature (Tsk) did not induce further consistent BV changes.
- The rate of protein entry into the intravascular space accelerated during exercise, leading to increased intravascular protein post-exercise and during recovery.
Conclusions:
- Intravascular volume responses to running are primarily dictated by postural hemoconcentration preceding exercise.
- Running itself and associated thermal stress have minimal subsequent impact on blood volume.
- A hypothesis suggests posture-dependent pre-exercise blood volume influences diverse exercise-induced BV effects.