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Published on: May 18, 2018
Running interval training and estimated plasma-volume variation
Abderraouf Ben Abderrahman1, Jacques Prioux, Karim Chamari
1Rennes 2 University, Rennes, France.
Seven weeks of endurance interval training (IT) significantly increased plasma volume, enhancing aerobic fitness. This training boosted maximal aerobic power and speed in male subjects.
Area of Science:
- Exercise Physiology
- Sports Science
- Cardiovascular Adaptations
Background:
- Endurance interval training (IT) is a common method to improve aerobic fitness.
- Understanding the physiological adaptations, such as changes in blood volume, is crucial for optimizing training protocols.
- Hematocrit (Ht), hemoglobin (Hb), and plasma volume variation (PVV) are key indicators of cardiovascular response to exercise.
Purpose of the Study:
- To investigate the effects of 7 weeks of IT on Ht, Hb, and estimated PVV.
- To examine the relationship between PVV and maximal aerobic capacity (MAP and MAS) after training.
- To determine if IT influences blood volume regulation during maximal exercise.
Main Methods:
- 15 male subjects were divided into a control group (n=6) and an IT group (n=9).
- The IT group underwent 7 weeks of training, 3 times per week.
- Maximal graded exercise tests (GXT) were conducted pre- and post-training to assess MAP and MAS. Blood samples were collected at rest, peak exercise, and during recovery to measure Ht, Hb, and lactate.
Main Results:
- Maximal aerobic power (MAP) and maximal aerobic speed (MAS) significantly increased in the training group post-intervention (P < .05).
- Resting hematocrit (Ht) was significantly lower in the training group compared to the control group after 7 weeks (P < .05).
- Interval training induced a significant increase in estimated plasma volume variation (PVV) at rest in the training group (P < .05).
- Significant correlations were found between end-test PVV and MAS (r = .60) and MAP (r = .76) in the training group post-training (P < .05).
Conclusions:
- Seven weeks of IT significantly increases plasma volume in male subjects.
- The observed increase in plasma volume may contribute to the enhanced aerobic fitness, indicated by improvements in MAP and MAS.
- PVV measured at the end of maximal exercise is related to aerobic performance improvements following IT.
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