Abstract
Cold-water immersion (CWI) elicits the cold shock response (CSR). The hyperventilatory component of the CSR causes a decrease in cerebral blood flow velocity (CBFv) potentially causing sensations of dizziness and increasing the risk of becoming unconscious and consequently drowning [1]. In these early minutes of CWI the current advice is to 'float first' and remain stationary [2] yet this strategy may not have any effect on ventilation and therefore brain CBFv. We tested the hypothesis that leg only exercise could offset the reduction in CBFv in a resting CWI (H1) and be absent in warm water immersion.
Highlights
Cold-water immersion (CWI) elicits the cold shock response (CSR)
Exercise & Rehabilitation, Northumbria University, UK Full list of author information is available at the end of the article
Leg kicking on CWI partially offset the reduction in cerebral blood flow velocity (CBFv) that normally occurs on CWI; in contrast to a warm water control
Summary
Cold-water immersion (CWI) elicits the cold shock response (CSR). The hyperventilatory component of the CSR causes a decrease in cerebral blood flow velocity (CBFv) potentially causing sensations of dizziness and increasing the risk of becoming unconscious and drowning [1]. Methods Seventeen participants consented and visited the laboratory 3 times; mean [SD]: age 21 [3]yrs; height 1.71 [.01] m; mass 70.9 [10.1]kg. All immersions were standardised by depth, duration, clothing (bathing suit) and time of day.
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