TY - JOUR
TI - Heat acclimation enhances the cold-induced vasodilation response
AU - Ciuha, Ursa
AU - Sotiridis, Alexandros
AU - Mlinar, Tinkara
AU - Royal,
AU - Joshua T.
AU - Eiken, Ola
AU - Mekjavic, Igor B.
JO - European Journal of Applied Physiology
PY - 2021
VL - 121
TODO - 11
SP - 3005-3015
PB - Springer-Verlag
SN - 1439-6319, 1439-6327
TODO - 10.1007/s00421-021-04761-x
TODO - Cold-induced vasodilation; Cross-adaptation; Exercise training; Heat
acclimation; Hypoxic acclimation
TODO - Purpose It has been reported that the cold-induced vasodilation (CIVD)
response can be trained using either regular local cold stimulation or
exercise training. The present study investigated whether repeated
exposure to environmental stressors, known to improve aerobic
performance (heat and/or hypoxia), could also provide benefit to the
CIVD response.
Methods Forty male participants undertook three 10-day acclimation
protocols including daily exercise training: heat acclimation (HeA;
daily exercise training at an ambient temperature, T-a = 35 degrees C),
combined heat and hypoxic acclimation (HeA/HypA; daily exercise training
at T-a = 35 degrees C, while confined to a simulated altitude of similar
to 4000 m) and exercise training in normoxic thermoneutral conditions
(NorEx; no environmental stressors). To observe potential effects of the
local acclimation on the CIVD response, participants additionally
immersed their hand in warm water (35 degrees C) daily during the
HeA/HypA and NorEx. Before and after the acclimation protocols,
participants completed hand immersions in cold water (8 degrees C) for
30 min, followed by 15-min recovery phases. The temperature was measured
in each finger.
Results Following the HeA protocol, the average temperature of all five
fingers was higher during immersion (from 13.9 +/- 2.4 to 15.5 +/- 2.5
degrees C; p = 0.04) and recovery (from 22.2 +/- 4.0 to 25.9 +/- 4.9
degrees C; p = 0.02). The HeA/HypA and NorEx protocols did not enhance
the CIVD response.
Conclusion Whole-body heat acclimation increased the finger vasodilatory
response during cold-water immersion, and enhanced the rewarming rate of
the hand, thus potentially contributing to improved local cold
tolerance. Daily hand immersion in warm water for 10 days during HeA/Hyp
and NorEx, did not contribute to any changes in the CIVD response.
ER -