Interethnic differences at the thermometric response to cold test: functional disorders of blood circulation in hand fingers and exposure to hand-arm vibration.
OBJECTIVE
To report some notable aspects regarding thermometric response to cold test in black African subjects compared with Caucasians: both groups comprised persons exposed to hand-arm vibration and controls.


METHODS
An overall sample of 48 workers was examined in order to study their blood circulation in hand fingers: a control group of 12 healthy Caucasian workers never exposed before to hand-arm vibration; 12 Caucasian workers exposed for several years to vibrating tools and affected by occupational Raynaud's phenomenon; 12 healthy black African workers exposed to hand-arm vibration for almost 3 years; and 12 healthy black African workers never exposed to hand-arm vibration. Computerized skin thermometry was performed and thermometric curves were analyzed according to thermometric interpretation criteria such as the area-over-curve (AOC), the fifth minute of recovery/baseline temperature ratio (5REC/BT) and the temperature at the tenth minute of recovery (10REC) after cold test.


RESULTS
Thermometric parameters in Caucasian subjects confirmed the basis of the existing literature in controls (basal finger temperature higher than 32 degrees C and complete recovery to the initial temperature after the cold test) and also in patients with Raynaud's phenomenon (basal temperature often lower than control subjects and slow recovery of finger temperature after cold test). Statistically significant difference was found between healthy Caucasians and healthy black subjects in all the parameters tested: healthy black subjects showed values of AOC and 10REC suggesting almost constantly lower finger temperatures during the thermometry test. Black people, both exposed and non-exposed to hand-arm vibration showed thermometric parameters suggesting poor blood microcirculation, which seems even poorer than in Caucasian people complaining Raynaud's phenomenon.


CONCLUSIONS
Our chronothermometric tests suggest some significant interethnic differences in peripheral microcirculation, which seems rather poor in black African subjects in comparison with Caucasians.
Riolfi
A
A
Occupational Medicine: Department of Medicine and Public Health, University of Verona, P.le L.A. Scuro 10, Verona, Italy.
Princivalle
A
A
Romeo
L
L
Caramaschi
P
P
Perbellini
L
L
D001741:Black or African American; D003080:Cold Temperature; D005385:Fingers / Q000098:blood supply* / Q000503:physiopathology; D006801:Humans; D008833:Microcirculation; D009784:Occupational Diseases / Q000208:ethnology / Q000209:etiology / Q000503:physiopathology; D016273:Occupational Exposure / Q000009:adverse effects; D014732:Vibration / Q000009:adverse effects*; D044465:White People
J Occup Health. 2005 Mar;47(2):165-70
15824482
Circulation. 2004 Jun 1;109(21):2511-7
15159296
Ind Health. 1992;30(1):1-22
1618652
Arterioscler Thromb Vasc Biol. 1999 Mar;19(3):656-64
10073970
Br J Ind Med. 1991 Jul;48(7):480-4
1854650
Ann Hum Biol. 1997 Jul-Aug;24(4):323-31
9239438
Int Arch Occup Environ Health. 2002 Jan;75(1-2):6-13
11898878
Cent Eur J Public Health. 1995;3 Suppl:90-2
9150981
Circ Res. 2001 Jan 19;88(1):12-21
11139468
Hypertension. 1996 Oct;28(4):652-5
8843893
FASEB J. 1989 Jan;3(1):31-6
2642868
Med Lav. 1986 Mar-Apr;77(2):195-207
3724648
Am J Cardiol. 2006 Mar 1;97(5):685-9
16490438
Scand J Work Environ Health. 1987 Aug;13(4):352-5
3433037
Arterioscler Thromb Vasc Biol. 2002 Jul 1;22(7):1122-7
12117726
Scand J Work Environ Health. 1987 Aug;13(4):275-8
3433028
Ind Health. 2005 Jul;43(3):480-3
16100924
J Am Coll Cardiol. 2002 Aug 21;40(4):754-60
12204507
Hypertension. 2000 Mar;35(3):722-5
10720585
Hypertension. 2000 Nov;36(5):866-71
11082158
Circulation. 2004 Jun 29;109 (25):3191-5
15148269
Med Lav. 1984 Jul-Aug;75(4):282-95
6503844
Occup Environ Med. 2003 Dec;60(12):962-8
14634190
Hypertension. 2000 Dec;36(6):945-51
11116105
J Neural Transm (Vienna). 1999;106(9-10):835-48
10599866
Circulation. 2005 Dec 13;112(24):3795-801
16330685
Am Heart J. 2004 Oct;148(4):606-11
15459590
Int Arch Occup Environ Health. 2001 Jul;74(5):325-35
11516067
Scand J Work Environ Health. 1987 Aug;13(4):348-51
3324314
Int Arch Occup Environ Health. 1994;66(2):137-40
7806397
J Natl Med Assoc. 2001 Apr;93(4):113-9
12653397