Abstract
Previous work has demonstrated a direct relationship between aerobic fitness and vasodilatory function (i.e., flow-mediated dilation; FMD); however, the relation between aerobic fitness and vasoconstrictor responsiveness (i.e., low flow-mediated constriction; L-FMC), and the overall vasoactive range (FMD + L-FMC) is unclear.
Purpose
To test the hypothesis that L-FMC and the overall vasoactive range (FMD + L-FMC) will be related to aerobic fitness in young, healthy men.
Methods
Twenty men (age: 23 ± 5 years) were recruited, and divided evenly into a higher (HF) vs. lower (LF) aerobic fitness group, quantified via YMCA cycle ergometry (VO2 peak extrapolation), and a 3-min step test (1-min heart rate recovery). Duplex Doppler-ultrasound was used to assess brachial artery FMD and L-FMC.
Results
Estimated VO2 peak (HF = 55 ± 10 vs. LF = 38 ± 5 mL/kg/min) and heart rate recovery (HF = 36 ± 10 vs. LF = 25 ± 8 beats) were greater in the HF group (P < 0.05). FMD and the vasoactive range were similar between groups; however, L-FMC was significantly greater in HF (HF = −2.5 ± 1.6 vs. LF = −0.7 ± 1.8%, P < 0.05; d = 1.18). A correlational analysis revealed an inverse relationship between L-FMC and both HR recovery (r = −0.665, P < 0.01) and estimated VO2 peak (r = −0.5, P < 0.05).
Conclusions
This work supports an association between L-FMC and aerobic fitness in young, healthy men. Longitudinal or interventional studies are warranted to support causality, and to distinguish whether L-FMC is more sensitive to changes in aerobic fitness than FMD.
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Abbreviations
- AUC:
-
Area under curve,
- AVI:
-
Audio visual interleave
- BP:
-
Blood pressure
- CVD:
-
Cardiovascular disease
- ECG:
-
Electrocardiography
- FMD:
-
Flow-mediated dilation
- FMD + L-FMC:
-
Numerical sum for vasoactive range
- HF:
-
Higher fit
- LF:
-
Lower fit
- L-FMC:
-
Low flow-mediated constriction
- Nm:
-
Newton meters
- OSI:
-
Oscillatory shear index
- RPM:
-
Revolutions per minute
- VO2 :
-
Oxygen consumption
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The authors would like to thank the time and effort put in by all volunteer subjects.
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PLB and DPC, conception and design of research; PLB, ETK, SMM, and DPC, performed experiments; PLB and DPC analyzed data; PLB, ETK, SMM, and DPC, interpreted results of experiment; PLB, prepared figures; PLB, and DPC, drafted manuscript; PLB, ETK, SMM, and DPC edited and revised manuscript; and PLB, ETK, SMM, and DPC, approved final version of the manuscript.
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Communicated by Mark Olfert.
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Bell, P.L., Kelley, E.T., McCoy, S.M. et al. Influence of aerobic fitness on vasoreactivity in young men. Eur J Appl Physiol 117, 2075–2083 (2017). https://doi.org/10.1007/s00421-017-3698-6
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DOI: https://doi.org/10.1007/s00421-017-3698-6