Cold-induced vasodilation responses before and after exercise in normobaric normoxia and hypoxia
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Cold-induced vasodilation (CIVD) is known to protect humans against local cold injuries and improve manual dexterity. The current study examined the effects of metabolic heat production on cold-induced vasodilation responses in normobaric hypoxia and normoxia.
Ten participants immersed their non-dominant hand into 5 °C water for 15 min. Minimum finger temperature (Tmin), maximum finger temperature (Tmax), onset time, amplitude, and peak time were measured before and after exercise under normoxia (21% O2) and two levels of normobaric hypoxia (17% O2 and 13% O2).
Neither Tmin nor amplitude was affected by hypoxia. However, Tmax was significantly decreased by hypoxia while reduction in onset time and peak time trended towards significance. Tmin, Tmax, and amplitude were significantly higher during post-exercise CIVD than pre-exercise CIVD.
The CIVD response may be negatively affected by the introduction of hypoxia whereas metabolic heat production via exercise may counteract adverse effects of hypoxia and improve CIVD responses.
KeywordsCold-induced vasodilation Normobaric hypoxia Exercise Body temperature
Metabolic heat production
Peripheral oxygen saturation
Mean body temperature
Maximum finger temperature
Minimum finger temperature
Maximal oxygen uptake
HG assisted in study design, data collection, and manuscript authorship; YS assisted in study design and manuscript authorship; JV assisted in data collection and manuscript authorship; BF assisted in data collection and manuscript authorship; JB assisted in study design and data analysis; JK assisted in study design and manuscript authorship; TQ assisted in manuscript authorship; EG assisted in data collection and manuscript authorship.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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