Abstract
Introduction
Acute aerobic exercise prevents sitting-induced impairment of flow-mediated dilation (FMD). Further, evidence suggests that sitting-induced impairment of FMD occurs via an oxidative stress-dependent mechanism that disrupts endothelial function.
Purpose
We hypothesized that acute aerobic exercise would prevent impairment of femoral artery FMD by limiting oxidative stress responses that increase endothelin-1 (ET-1) levels and disrupt nitric oxide (NO) status.
Methods
In a randomized, cross-over study, healthy men (n = 11; 21.2 ± 1.9 years) completed two 3 h sitting trials that were preceded by 45 min of either quiet rest (REST) or a single bout of continuous treadmill exercise (65% maximal oxygen consumption) (EX). Superficial femoral artery FMD, plasma glucose, malondialdehyde (MDA), ET-1, arginine (ARG) and its related metabolites [homoarginine (HA), asymmetric dimethylarginine (ADMA), symmetric dimethylarginine (SDMA)] were assessed at baseline, 1 h following EX (or REST) (0 h), and at 1 h intervals during 3 h of uninterrupted sitting. Data were analyzed using repeated measures ANOVA.
Results
During REST, femoral artery FMD declined from baseline (2.6 ± 1.8%) at 1, 2, and 3 h of sitting and resting shear rate decreased at 3 h. In contrast, when sitting was preceded by EX, femoral artery FMD (2.7 ± 2.0%) and resting shear rate responses were unaffected. No between trial differences were detected for plasma glucose, MDA, ET-1, ARG, HA, ADMA, or SDMA.
Conclusion
Prior aerobic exercise prevented the decline in femoral artery FMD that is otherwise induced by prolonged sitting independent of changes in oxidative stress, ET-1, and NO status.
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Abbreviations
- ADMA:
-
Asymmetric dimethylarginine
- ANCOVA:
-
Analysis of covariance
- ANOVA:
-
Analysis of variance
- ARG:
-
Arginine
- AUCSR :
-
Shear rate area under the curve
- BMI:
-
Body mass index
- DBP:
-
Diastolic blood pressure
- ELISA:
-
Enzyme-linked immunosorbent assay
- ET-1:
-
Endothelin-1
- EX:
-
Exercise
- FMD:
-
Flow-mediated dilation
- HA:
-
Homoarginine
- HPLC:
-
High-performance liquid chromatography
- MAP:
-
Mean arterial pressure
- MDA:
-
Malondialdehyde
- NO:
-
Nitric oxide
- REST:
-
Quiet rest
- SBP:
-
Systolic blood pressure
- SDMA:
-
Symmetric dimethylarginine
- TBA:
-
Thiobarbituric acid
- VO2max:
-
Maximal oxygen consumption
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Acknowledgements
This study was supported by a College of Education, Health, and Society Seed Grant and Miami University Undergraduate Summer Scholars Program. The authors acknowledge the contributions of our participants and Kristina Arslain for her assistance with diet record entry.
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Communicated by Mark Olfert.
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Ballard, K.D., Duguid, R.M., Berry, C.W. et al. Effects of prior aerobic exercise on sitting-induced vascular dysfunction in healthy men. Eur J Appl Physiol 117, 2509–2518 (2017). https://doi.org/10.1007/s00421-017-3738-2
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DOI: https://doi.org/10.1007/s00421-017-3738-2