Blood Flow and Oxygen Levels in Muscle During Exercise
Author Information
Author(s): Izumi Kazuma, Yamamori Keisuke, Katayama Keisho, Kano Yutaka, Tanaka Noriko, Akima Hiroshi
Primary Institution: Nagoya University
Hypothesis
Intramuscular blood flow would increase and StO2 would decrease linearly with an increase in exercise intensity.
Conclusion
Intramuscular blood flow reached a plateau above moderate exercise intensities, while muscle oxygen saturation continued to decrease.
Supporting Evidence
- Intramuscular blood flow increased from 0.5% at rest to 13.9% at task failure.
- StO2 significantly decreased from 30% to 70% MVC.
- Intramuscular blood flow significantly increased from rest to 30% and 40% MVC.
Takeaway
When you exercise, your muscles get more blood, but at a certain point, they can't get enough oxygen even though the blood flow is high.
Methodology
Fifteen healthy male subjects performed intermittent and incremental isometric knee extensions while measuring intramuscular blood flow and muscle oxygen saturation.
Potential Biases
Only young healthy males were recruited, which may limit the generalizability of the findings.
Limitations
Intramuscular blood flow was measured only at mid-thigh of the VL, which may not represent changes across the whole muscle.
Participant Demographics
Fifteen healthy male subjects, average age 21.7 years.
Statistical Information
P-Value
0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website