Insulation reduces heat exchange between a body and the environment. Glabrous (nonhairy) skin surfaces (palms of the hands, soles of the feet, face, and ears) constitute a small percentage of total body surface area but contain specialized vascular structures that facilitate heat loss. We have previously reported that cooling the glabrous skin surfaces is effective in alleviating heat stress and that the application of local subatmospheric pressure enhances the effect. In this paper, we compare the effects of cooling multiple glabrous skin surfaces with and without vacuum on thermal recovery in heavily insulated heat-stressed individuals. Esophageal temperatures (Tes) and heart rates were monitored throughout the trials. Water loss was determined from pre- and post-trial nude weights. Treadmill exercise (5.6 km/h, 9–16% slope, and 25–45 min duration) in a hot environment (41.5°C, 20–30% relative humidity) while wearing insulating pants and jackets was used to induce heat stress (Tes39°C). For postexercise recovery, the subjects donned additional insulation (a balaclava, winter gloves, and impermeable boot covers) and rested in the hot environment for 60 min. Postexercise cooling treatments included control (no cooling) or the application of a 10°C closed water circulating system to (a) the hand(s) with or without application of a local subatmospheric pressure, (b) the face, (c) the feet, or (d) multiple glabrous skin regions. Following exercise induction of heat stress in heavily insulated subjects, the rate of recovery of Tes was 0.4±0.2°C/h(n=12), but with application of cooling to one hand, the rate was 0.8±0.3°C/h(n=12), and with one hand cooling with subatmospheric pressure, the rate was 1.0±0.2°C/h(n=12). Cooling alone yielded two responses, one resembling that of cooling with subatmospheric pressure (n=8) and one resembling that of no cooling (n=4). The effect of treating multiple surfaces was additive (no cooling, ΔTes=0.4±0.2°C; one hand, 0.9±0.3°C; face, 1.0±0.3°C; two hands, 1.3±0.1°C; two feet, 1.3±0.3°C; and face, feet, and hands, 1.6±0.2°C). Cooling treatments had a similar effect on water loss and final resting heart rate. In heat-stressed resting subjects, cooling the glabrous skin regions was effective in lowering Tes. Under this protocol, the application of local subatmospheric pressure did not significantly increase heat transfer per se but, presumably, increased the likelihood of an effect.

1.
Allsopp
,
A. J.
, and
Poole
,
K. A.
, 1991, “
The Effect of Hand Immersion on Body Temperature When Wearing Impermeable Clothing
,”
J. R. Nav Med. Serv
0035-9033,
77
(
1
), pp.
41
47
.
2.
Giesbrecht
,
G. G.
,
Jamieson
,
C.
, and
Cahill
,
F.
, 2007, “
Cooling Hyperthermic Firefighters by Immersing Forearms and Hands in 10 Degrees C and 20 Degrees C Water
,”
Aviat., Space Environ. Med.
0095-6562,
78
(
6
), pp.
561
567
.
3.
House
,
J. R.
,
Holmes
,
C.
, and
Allsopp
,
A. J.
, 1997, “
Prevention of Heat Strain by Immersing the Hands and Forearms in Water
,”
J. R. Nav Med. Serv
0035-9033,
83
(
1
), pp.
26
30
.
4.
Livingstone
,
S. D.
,
Nolan
,
R. W.
, and
Cattroll
,
S. W.
, 1989, “
Heat Loss Caused by Immersing the Hands in Water
,”
Aviat., Space Environ. Med.
0095-6562,
60
(
12
), pp.
1166
1171
.
5.
Livingstone
,
S. D.
,
Nolan
,
R. W.
, and
Keefe
,
A. A.
, 1995, “
Heat Loss Caused by Cooling the Feet
,”
Aviat., Space Environ. Med.
0095-6562,
66
(
3
), pp.
232
237
.
6.
Tipton
,
M. J.
,
Allsopp
,
A.
,
Balmi
,
P. J.
, and
House
,
J. R.
, 1993, “
Hand Immersion as a Method of Cooling and Rewarming: A Short Review
,”
J. R. Nav Med. Serv
0035-9033,
79
(
3
), pp.
125
131
.
7.
Selkirk
,
G. A.
,
McLellan
,
T. M.
, and
Wong
,
J.
, 2004, “
Active Versus Passive Cooling During Work in Warm Environments While Wearing Firefighting Protective Clothing
,”
J. Occup. Environ. Hyg.
1545-9624,
1
(
8
), pp.
521
531
.
8.
Grahn
,
D. A.
,
Cao
,
V. H.
, and
Heller
,
H. C.
, 2005, “
Heat Extraction Through the Palm of One Hand Improves Aerobic Exercise Endurance in a Hot Environment
,”
J. Appl. Physiol.
8750-7587,
99
(
3
), pp.
972
978
.
9.
Hagobian
,
T. A.
,
Jacobs
,
K. A.
,
Kiratli
,
B. J.
, and
Friedlander
,
A. L.
, 2004, “
Foot Cooling Reduces Exercise-Induced Hyperthermia in Men With Spinal Cord Injury
,”
Med. Sci. Sports Exercise
0195-9131,
36
(
3
), pp.
411
417
.
10.
Hsu
,
A. R.
,
Hagobian
,
T. A.
,
Jacobs
,
K. A.
,
Attallah
,
H.
, and
Friedlander
,
A. L.
, 2005, “
Effects of Heat Removal Through the Hand on Metabolism and Performance During Cycling Exercise in the Heat
,”
Can. J. Appl. Physiol.
1066-7814,
30
(
1
), pp.
87
104
.
11.
Sangiorgi
,
S.
,
Manelli
,
A.
,
Congiu
,
T.
,
Bini
,
A.
,
Pilato
,
G.
,
Reguzzoni
,
M.
, and
Raspanti
,
M.
, 2004, “
Microvascularization of the Human Digit as Studied by Corrosion Casting
,”
J. Anat.
0021-8782,
204
(
2
), pp.
123
131
.
12.
Bergersen
,
T. K.
,
Hisdal
,
J.
, and
Walloe
,
L.
, 1999, “
Perfusion of the Human Finger During Cold-Induced Vasodilatation
,”
Am. J. Physiol.
0002-9513,
276
(
3
), pp.
R731
R737
.
13.
Bergersen
,
T. K.
,
Eriksen
,
M.
, and
Walloe
,
L.
, 1997, “
Local Constriction of Arteriovenous Anastomoses in the Cooled Finger
,”
Am. J. Physiol.
0002-9513,
273
(
3
), pp.
R880
R886
.
14.
Bergersen
,
T. K.
,
Eriksen
,
M.
, and
Walloe
,
L.
, 1995, “
Effect of Local Warming on Hand and Finger Artery Blood Velocities
,”
Am. J. Physiol.
0002-9513,
269
(
2
), pp.
R325
R330
.
15.
Flouris
,
A. D.
,
Westwood
,
D. A.
,
Mekjavic
,
I. B.
, and
Cheung
,
S. S.
, 2008, “
Effect of Body Temperature on Cold Induced Vasodilation
,”
Eur. J. Appl. Physiol.
0301-5548,
104
(
3
), pp.
491
499
.
16.
Johnson
,
J. M.
,
Pergola
,
P. E.
,
Liao
,
F. K.
,
Kellogg
,
D. L.
, Jr.
, and
Crandall
,
C. G.
, 1995, “
Skin of the Dorsal Aspect of Human Hands and Fingers Possesses an Active Vasodilator System
,”
J. Appl. Physiol.
8750-7587,
78
(
3
), pp.
948
954
.
17.
Yamazaki
,
F.
, 2002, “
Vasomotor Responses in Glabrous and Nonglabrous Skin During Sinusoidal Exercise
,”
Med. Sci. Sports Exercise
0195-9131,
34
(
5
), pp.
767
772
.
18.
Yamazaki
,
F.
, and
Sone
,
R.
, 2003, “
Skin Vascular Response in the Hand During Sinusoidal Exercise in Physically Trained Subjects
,”
Eur. J. Appl. Physiol.
0301-5548,
90
(
1–2
), pp.
159
164
.
19.
Grahn
,
D.
,
Brock-Utne
,
J. G.
,
Watenpaugh
,
D. E.
, and
Heller
,
H. C.
, 1998, “
Recovery From Mild Hypothermia Can Be Accelerated by Mechanically Distending Blood Vessels in the Hand
,”
J. Appl. Physiol.
8750-7587,
85
(
5
), pp.
1643
1648
.
20.
Goosey-Tolfrey
,
V.
,
Swainson
,
M.
,
Boyd
,
C.
,
Atkinson
,
G.
, and
Tolfrey
,
K.
, 2008, “
The Effectiveness of Hand Cooling at Reducing Exercise-Induced Hyperthermia and Improving Distance-Race Performance in Wheelchair and Able-Bodied Athletes
,”
J. Appl. Physiol.
8750-7587,
105
(
1
), pp.
37
43
.
21.
Zhu
,
M.
,
Ackerman
,
J. J.
,
Sukstanskii
,
A. L.
, and
Yablonskiy
,
D. A.
, 2006, “
How the Body Controls Brain Temperature: The Temperature Shielding Effect of Cerebral Blood Flow
,”
J. Appl. Physiol.
8750-7587,
101
(
5
), pp.
1481
1488
.
22.
Kenney
,
W. L.
, 2008, “
Human Cardiovascular Responses to Passive Heat Stress
,”
J. Physiol.
,
586
(
1
), p.
3
. 0022-3751
23.
Cadarette
,
B. S.
,
Cheuvront
,
S. N.
,
Kolka
,
M. A.
,
Stephenson
,
L. A.
,
Montain
,
S. J.
, and
Sawka
,
M. N.
, 2006, “
Intermittent Microclimate Cooling During Exercise-Heat Stress in US Army Chemical Protective Clothing
,”
Ergonomics
0014-0139,
49
(
2
), pp.
209
219
.
24.
Sessler
,
D. I.
, 2008, “
Temperature Monitoring and Perioperative Thermoregulation
,”
Anesthesiology
0003-3022,
109
(
2
), pp.
318
338
.
25.
Clough
,
D.
,
Kurz
,
A.
,
Sessler
,
D. I.
,
Christensen
,
R.
, and
Xiong
,
J.
, 1996, “
Thermoregulatory Vasoconstriction Does Not Impede Core Warming During Cutaneous Heating
,”
Anesthesiology
0003-3022,
85
(
2
), pp.
281
288
.
26.
Ereth
,
M. H.
,
Lennon
,
R. L.
, and
Sessler
,
D. I.
, 1992, “
Limited Heat Transfer Between Thermal Compartments During Rewarming in Vasoconstricted Patients
,”
Aviat., Space Environ. Med.
0095-6562,
63
(
12
), pp.
1065
1069
.
27.
Cadarette
,
B. S.
,
DeCristofano
,
B. S.
,
Speckman
,
K. L.
, and
Sawka
,
M. N.
, 1990, “
Evaluation of Three Commercial Microclimate Cooling Systems
,”
Aviat., Space Environ. Med.
0095-6562,
61
(
1
), pp.
71
76
.
28.
Cheuvront
,
S. N.
,
Kolka
,
M. A.
,
Cadarette
,
B. S.
,
Montain
,
S. J.
, and
Sawka
,
M. N.
, 2003, “
Efficacy of Intermittent, Regional Microclimate Cooling
,”
J. Appl. Physiol.
8750-7587,
94
(
5
), pp.
1841
1848
.
29.
Rowell
,
L. B.
, 1974, “
Human Cardiovascular Adjustments to Exercise and Thermal Stress
,”
Physiol. Rev.
0031-9333,
54
(
1
), pp.
75
159
.
30.
Roddie
,
I. C.
, 1983, “
Circulation to Skin and Adipose Tissue
,”
Handbook of Physiology. The Cardiovascular System: Peripheral Circulation and Organ Blood Flow
,
American Physiological Society
,
Bethesda, MD
, pp.
285
317
.
31.
Manelli
,
A.
,
Sangiorgi
,
S.
,
Ronga
,
M.
,
Reguzzoni
,
M.
,
Bini
,
A.
, and
Raspanti
,
M.
, 2005, “
Plexiform Vascular Structures in the Human Digital Dermal Layer: A SEM-Corrosion Casting Morphological Study
,”
Eur. J. Morphol.
0924-3860,
42
(
4–5
), pp.
173
177
.
32.
Yamazaki
,
F.
, and
Sone
,
R.
, 2006, “
Different Vascular Responses in Glabrous and Nonglabrous Skin With Increasing Core Temperature During Exercise
,”
Eur. J. Appl. Physiol.
0301-5548,
97
(
5
), pp.
582
590
.
33.
Yamazaki
,
F.
,
Takahara
,
K.
,
Sone
,
R.
, and
Johnson
,
J. M.
, 2007, “
Influence of Hyperoxia on Skin Vasomotor Control in Normothermic and Heat-Stressed Humans
,”
J. Appl. Physiol.
8750-7587,
103
(
6
), pp.
2026
2033
.
34.
Vanggaard
,
L.
,
Eyolfson
,
D.
,
Xu
,
X.
,
Weseen
,
G.
, and
Giesbrecht
,
G. G.
, 1999, “
Immersion of Distal Arms and Legs in Warm Water (AVA Rewarming) Effectively Rewarms Mildly Hypothermic Humans
,”
Aviat., Space Environ. Med.
0095-6562,
70
(
11
), pp.
1081
1088
.
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