Cold induced vasodilatation and cardiovascular responses in humans during cold water immersion of various upper limb areas
| Autor: | Yves Besnard, Gustave Savourey, Isabelle Sendowski, Jacques Bittel |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Bradycardia
Adult Male Physiology Hemodynamics Vasodilation Blood Pressure Fingers Forearm Heart Rate Physiology (medical) Skin Physiological Phenomena Heart rate Immersion medicine Humans Orthopedics and Sports Medicine Pain Measurement Skin Chemistry Public Health Environmental and Occupational Health General Medicine Index finger Laser Doppler velocimetry Hand Cold Temperature medicine.anatomical_structure Blood pressure Anesthesia Vascular Resistance medicine.symptom Skin Temperature |
| Zdroj: | European journal of applied physiology and occupational physiology. 75(6) |
| ISSN: | 0301-5548 |
| Popis: | To study the physiological responses induced by immersing in cold water various areas of the upper limb, 20 subjects immersed either the index finger (T1), hand (T2) or forearm and hand (T3) for 30 min in 5 degrees C water followed by a 15-min recovery period. Skin temperature of the index finger, skin blood flow (Qsk) measured by laser Doppler flowmetry, as well as heart rate (HR) and mean arterial blood pressure (BPa) were all monitored during the test. Cutaneous vascular conductance (CVC) was calculated as Qak/BPa. Cold induced vasodilatation (CIVD) indices were calculated from index finger skin temperature and CVC time courses. The results showed that no differences in temperature, CVC or cardiovascular changes were observed between T2 and T3. During T1, CIVD appeared earlier compared to T2 and T3 [5.90 (SEM 0.32) min in T1 vs 7.95 (SEM 0.86) min in T2 and 9.26 (SEM 0.78) min in T3, P < 0.01]. The HR was unchanged in T1 whereas it increased significantly at the beginning of T2 and T3 [+13 (SEM 2) beats.min-1 in T2 and +15 (SEM 3) beats.min-1 in T3, P < 0.01] and then decreased at the end of the immersion [-12 (SEM 3) beats.min-1 in T2, and -15 (SEM 3) beats.min-1 in T3, P < 0.01]. Moreover, BPa increased at the beginning of T1 but was lower than in T2 and T3 [+9.3 (SEM 2.5) mmHg in T1, P < 0.05; +20.6 (SEM 2.6) mmHg and 26.5 (SEM 2.8) mmHg in T2 and T3, respectively, P < 0.01]. The rewarming during recovery was faster and higher in T1 compared to T2 and T3. These results showed that general and local physiological responses observed during an upper limb cold water test differed according to the area immersed. Index finger cooling led to earlier and faster CIVD without significant cardiovascular changes, whereas hand or forearm immersion led to a delayed and slower CIVD with a bradycardia at the end of the test. |
| Databáze: | OpenAIRE |
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