Impacts of prolonged sitting with mild hypercapnia on vascular and autonomic function in healthy recreationally active adults
Key result
Prolonged sitting in mild hypercapnia reduces popliteal artery FMD by ~49% versus normal ambient conditions.
- P<0.05
- n=12
Why the study?
Does prolonged sitting with mild hypercapnia exacerbate peripheral endothelial and microvascular dysfunction compared to prolonged sitting alone in healthy recreationally active adults?
Population
Healthy recreationally active adults
Comparison
Prolonged sitting with mild hypercapnia vs prolonged sitting
Authors
Discussion
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Implication
Mild hypercapnia during sitting may worsen endothelial dysfunction; leaves open real-world relevance and need for confirmatory trials.
Study Design
Type
RCT (n=12)
Randomization
Randomized crossover
Multicenter
No
Structured PICO
Does prolonged sitting with mild hypercapnia exacerbate peripheral endothelial and microvascular dysfunction compared to prolonged sitting alone in healthy recreationally active adults?
P
Population
Healthy recreationally active adults
I
Intervention
Prolonged sitting with mild hypercapnia
C
Comparator
Prolonged sitting alone
O
Outcome
Endothelial function and microvascular functionsurrogate
Main Result
Absolute Event Rate: 2.5% vs 4.9%
p-value: p=<0.05
Mild hypercapnia, common in everyday environments, worsens the negative impacts of prolonged sitting on vascular function in healthy adults.
Limitations
- Small sample size
- Did not directly measure shear rate and blood ET-1 levels
- Did not directly measure hypercapnia-mediated alterations in sympathetic output using MSNA
Cite This Study
Headid et al. (2020) conducted an RCT in Healthy recreationally active adults (n=12). Prolonged sitting with mild hypercapnia vs. Prolonged sitting in normal atmospheric conditions was evaluated on Post-sitting popliteal artery flow-mediated dilation (FMD) (p=<0.05). Prolonged sitting in mild hypercapnic conditions significantly exacerbated the reduction in popliteal artery flow-mediated dilation to 2.5% compared to 4.9% in normal ambient conditions.