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- W2157449135 abstract "The aim of the present study was to determine diurnal variations in total forearm and skin microcirculatory blood flow in healthy man. At six time points between 08.00 and 18.00 hours was measured: blood pressure, forearm blood flow (FBF; strain gauge plethysmography), skin thermoregulatory blood flow (LDF; laser-Doppler fluxmetry), and skin nutritive blood flow (CBV: Capillary Blood Cell Velocity; intravital capillary microscopy) in 15 healthy, fasting, and resting men. FBF increased gradually from 2.8 in the morning to 4.3 ml 100 ml min-1 in the afternoon (p < 0.001). In contrast, LDF decreased, predominantly in the morning, from 18.3 at 09.00 hours to 13.1 at 12.00 hours and to 12.1 perfusion units at 17.30 hours (p < 0.001). However, performing the same protocol starting in the afternoon resulted in a similar initial decrease in LDF, suggesting an acclimatization phenomenon. Although not statistically significant, the decrease in CBV showed a similar pattern as compared to LDF. Blood pressure did not change. In conclusion, forearm blood flow increased during the day, probably due to diurnal variation in muscle flow. The initial decrease we observed in skin thermoregulatory blood flow is probably not related to diurnal variation but due to long-term acclimatization to the experimental conditions. These data suggest different regulatory mechanisms for the different vascular beds studied. Measurements of forearm blood flow should preferably be performed at the same time of day, and skin microcirculatory haemodynamic measurements should be performed after a standard period of acclimatization." @default.
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- W2157449135 date "1994-01-01" @default.
- W2157449135 modified "2023-10-14" @default.
- W2157449135 title "Diurnal variations in total forearm and skin microcirculatory blood flow in man" @default.
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- W2157449135 doi "https://doi.org/10.3109/00365519409086523" @default.
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