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Finger systolic blood pressures after cold provocation in healthy males and females: effect of room temperature

Vibration-induced white finger (VWF) is the vascular component of the hand-arm vibration syndrome (HAVS). International Standard 14835-2:2005 defines how the measurement of finger systolic blood pressure, FSBP, after finger cooling can be used to assist the diagnosis of VWF, but it requires that room temperature is maintained at 21±1°C. This study investigates the effects of room temperature on finger systolic blood pressures after cold provocation. Twelve healthy males and twelve healthy females participated in two sessions with the room temperature at either 20 or 28°C. The FSBP after warming or cooling the fingers to 30, 15, and 10°C was measured in both sessions. There were significant reductions in FSBP at both 15 and 10°C compared with 30°C, and lower FSBPs with the room temperature at 20°C than at 28°C. The percentage reductions in FSBPs at 15 and 10°C from those at 30°C, corrected for any changes in blood pressure in the thumb, (i.e., %FSBP) did not differ between the two room temperatures. Females had lower FSBPs than males at 30, 15, and 10°C, but %FSBPs were similar in males and females. The study suggests that the calculation of percentage changes in finger systolic blood pressure reduces the effects of room temperature and gender, and that the test may be used in conditions where the ±1°C tolerance on room temperature cannot be achieved.