J Exerc Nutrition Biochem. 2014 Dec;18(4):327-32. doi: 10.5717/jenb.2014.18.4.327. Epub 2014 Nov 27.
Possible influences of exercise-intensity-dependent increases in non-cortical hemodynamic variables on NIRS-based neuroimaging analysis during cognitive tasks: Technical note.
Journal of exercise nutrition & biochemistry
Kyeongho Byun, Kazuki Hyodo, Kazuya Suwabe, Sylwester Kujach, Morimasa Kato, Hideaki Soya
Affiliations
Affiliations
- Laboratory of Exercise Biochemistry and Neuroendocrinology, Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan.
- Department of Physiology, Gdansk University of Physical Education and Sport, Gdansk, Poland.
- Department of Health and Nutrition, Yonezawa Nutrition University of Yamagata Prefecture, Yamagata, Japan.
PMID: 25671198
PMCID: PMC4322022 DOI: 10.5717/jenb.2014.18.4.327
Abstract
PURPOSE: Functional near-infrared spectroscopy (fNIRS) provides functional imaging of cortical activations by measuring regional oxy- and deoxy-hemoglobin (Hb) changes in the forehead during a cognitive task. There are, however, potential problems regarding NIRS signal contamination by non-cortical hemodynamic (NCH) variables such as skin blood flow, middle cerebral artery blood flow, and heart rate (HR), which are further complicated during acute exercise. It is thus necessary to determine the appropriate post-exercise timing that allows for valid NIRS assessment during a task without any increase in NCH variables. Here, we monitored post-exercise changes in NCH parameters with different intensities of exercise.
METHODS: Fourteen healthy young participants cycled 30, 50 and 70% of their peak oxygen uptake (Vo2peak) for 10 min per intensity, each on different days. Changes in skin blood flow velocity (SBFv), middle cerebral artery mean blood velocity (MCA V mean) and HR were monitored before, during, and after the exercise.
RESULTS: Post-exercise levels of both SBFv and HR in contrast to MCA V mean remained high compared to basal levels and the times taken to return to baseline levels for both parameters were delayed (2-8 min after exercise), depending upon exercise intensity.
CONCLUSION: These results indicate that the delayed clearance of NCH variables of up to 8 min into the post-exercise phase may contaminate NIRS measurements, and could be a limitation of NIRS-based neuroimaging studies.
Keywords: NIRS; exercise intensity; non-cortical hemodynamic changes; post-exercise phase
References
- Am J Physiol Heart Circ Physiol. 2000 Jun;278(6):H1848-55 - PubMed
- J Appl Physiol (1985). 2008 Jan;104(1):306-14 - PubMed
- Circulation. 2002 Oct 1;106(14 ):1814-20 - PubMed
- J Physiol. 2005 Dec 1;569(Pt 2):697-704 - PubMed
- J Cereb Blood Flow Metab. 2003 Jan;23(1):1-18 - PubMed
- Neurosci Lett. 1993 May 14;154(1-2):101-4 - PubMed
- J Biomed Opt. 2005 Jan-Feb;10(1):11014 - PubMed
- Neuroimage. 2003 Jul;19(3):555-64 - PubMed
- J Biomed Opt. 2007 Nov-Dec;12(6):062111 - PubMed
- Trends Neurosci. 1997 Oct;20(10):435-42 - PubMed
- J Appl Physiol (1985). 2007 Feb;102(2):713-21 - PubMed
- J Appl Physiol (1985). 1992 Mar;72(3):1123-32 - PubMed
- Am J Physiol Regul Integr Comp Physiol. 2003 Jul;285(1):R200-7 - PubMed
- J Cereb Blood Flow Metab. 1993 May;13(3):516-20 - PubMed
- Am J Physiol Heart Circ Physiol. 2007 Feb;292(2):H976-83 - PubMed
- Neuroimage. 2014 Sep;98:336-45 - PubMed
- Brain Res. 2012 May 9;1453:87-101 - PubMed
- Hum Brain Mapp. 2002 Sep;17(1):61-71 - PubMed
- Acta Psychol (Amst). 2003 Mar;112(3):297-324 - PubMed
- Exp Gerontol. 2012 Aug;47(8):541-51 - PubMed
- J Physiol Sci. 2013 Jul;63(4):287-98 - PubMed
- Am J Physiol Regul Integr Comp Physiol. 2012 Oct 15;303(8):R791-8 - PubMed
- Physiol Behav. 2002 Aug;76(4-5):567-74 - PubMed
- J Appl Physiol. 1973 Aug;35(2):236-43 - PubMed
- Eur J Appl Physiol. 2013 Nov;113(11):2841-8 - PubMed
- J Sport Exerc Psychol. 2009 Aug;31(4):505-53 - PubMed
- J Appl Physiol. 1967 Jan;22(1):71-85 - PubMed
- Acta Physiol Scand. 1996 Dec;158(4):349-56 - PubMed
- Neurobiol Aging. 2012 Nov;33(11):2621-32 - PubMed
- Brain Res. 2010 Jun 23;1341:12-24 - PubMed
- Neuroimage. 2006 Jul 15;31(4):1592-600 - PubMed
- J Appl Physiol (1985). 2008 Jul;105(1):266-73 - PubMed
- J Appl Physiol. 1972 Sep;33(3):351-6 - PubMed
- Behav Brain Res. 2007 Jan 25;176(2):259-66 - PubMed
- J Appl Physiol (1985). 2006 Jan;100(1):221-4 - PubMed
- Neuroreport. 1996 Aug 12;7(12):1977-81 - PubMed
- Neuroimage. 2010 May 1;50(4):1702-10 - PubMed
- J Appl Physiol (1985). 2010 May;108(5):1210-6 - PubMed
- Med Phys. 1995 Dec;22(12):1997-2005 - PubMed
- Neurosci Lett. 1993 Feb 5;150(1):5-8 - PubMed
- Scand J Med Sci Sports. 2013 Feb;23 (1):e32-7 - PubMed
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