Tags

Type your tag names separated by a space and hit enter

Thermoregulatory responses to cold: effects of handwear with multi-layered clothing.
Aviat Space Environ Med. 1998 Nov; 69(11):1076-82.AS

Abstract

BACKGROUND

Thermoregulatory responses were studied during rest and exercise in men wearing diverse handwear with an extended cold-weather clothing system [ECWCS]. The ECWCS (thermal insulation = 3.6 clo (1 clo = thermal resistance approximately 0.155 m2.K.W(-1)); weight = 10.1 kg) incorporates skin-tight polypropylene underwear, polyester/cotton fatigues, polyester-insulated liners, balaclava, vapor-barrier boots, and polytetrafluroethylene [PTFE]-lined outer garments.

METHODS

Six fit males each rested (M = 71 W.m(-2) and performed treadmill exercise (M = 171 W.m(-2)) while wearing the following handwear with the ECWCS: a light duty glove (LD, clo = 0.86), a heavy duty glove (HD, clo = 1.05), or an Arctic mitten (AM, clo = 1.46). Cold exposures were at Ta = 0 degrees C, -20 degrees C, and -30 degrees C; rh = 20%; wind speed = 10.34 m.s(-1). Exposure was a target period of 120 min designated as maximal endurance time (ET, min). All experiments were performed on separate days. Rectal (Tre), middle finger (Tmf), and mean weighted skin (Tsk) temperatures were recorded continuously; oxygen uptake and heart rate were measured periodically and total body weight loss msw, g.h(-1)) was determined after each run.

RESULTS

During rest at 0 degrees C, the ECWCS maintained Tre at 37 degrees C for the maximal ET with all handwear configurations; for each lower ambient condition, steady-state Tre dropped -0.2 degrees C per each 10 C decrease in Ta.Tmf at or near 5 degrees C prior to the maximal ET was the basis for premature attrition; Tsk of 29.4 degrees C was associated with subjective thermal discomfort. ET was predicted adequately by combining Tmf, heat production, Tre and Tsk.

CONCLUSIONS

The ECWCS with specific handwear furnish adequate ET in cold-dry ambients provided that ventilation and removal of extra layers is an option during heavy exercise and thermal insulation is not decreased by body moisture.

Authors+Show Affiliations

U.S. Army Research Institute of Environmental Medicine, Natick, MA, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article

Language

eng

PubMed ID

9819165

Citation

Gonzalez, R R., et al. "Thermoregulatory Responses to Cold: Effects of Handwear With Multi-layered Clothing." Aviation, Space, and Environmental Medicine, vol. 69, no. 11, 1998, pp. 1076-82.
Gonzalez RR, Endrusick TL, Santee WR. Thermoregulatory responses to cold: effects of handwear with multi-layered clothing. Aviat Space Environ Med. 1998;69(11):1076-82.
Gonzalez, R. R., Endrusick, T. L., & Santee, W. R. (1998). Thermoregulatory responses to cold: effects of handwear with multi-layered clothing. Aviation, Space, and Environmental Medicine, 69(11), 1076-82.
Gonzalez RR, Endrusick TL, Santee WR. Thermoregulatory Responses to Cold: Effects of Handwear With Multi-layered Clothing. Aviat Space Environ Med. 1998;69(11):1076-82. PubMed PMID: 9819165.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Thermoregulatory responses to cold: effects of handwear with multi-layered clothing. AU - Gonzalez,R R, AU - Endrusick,T L, AU - Santee,W R, PY - 1998/11/18/pubmed PY - 1998/11/18/medline PY - 1998/11/18/entrez SP - 1076 EP - 82 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 69 IS - 11 N2 - BACKGROUND: Thermoregulatory responses were studied during rest and exercise in men wearing diverse handwear with an extended cold-weather clothing system [ECWCS]. The ECWCS (thermal insulation = 3.6 clo (1 clo = thermal resistance approximately 0.155 m2.K.W(-1)); weight = 10.1 kg) incorporates skin-tight polypropylene underwear, polyester/cotton fatigues, polyester-insulated liners, balaclava, vapor-barrier boots, and polytetrafluroethylene [PTFE]-lined outer garments. METHODS: Six fit males each rested (M = 71 W.m(-2) and performed treadmill exercise (M = 171 W.m(-2)) while wearing the following handwear with the ECWCS: a light duty glove (LD, clo = 0.86), a heavy duty glove (HD, clo = 1.05), or an Arctic mitten (AM, clo = 1.46). Cold exposures were at Ta = 0 degrees C, -20 degrees C, and -30 degrees C; rh = 20%; wind speed = 10.34 m.s(-1). Exposure was a target period of 120 min designated as maximal endurance time (ET, min). All experiments were performed on separate days. Rectal (Tre), middle finger (Tmf), and mean weighted skin (Tsk) temperatures were recorded continuously; oxygen uptake and heart rate were measured periodically and total body weight loss msw, g.h(-1)) was determined after each run. RESULTS: During rest at 0 degrees C, the ECWCS maintained Tre at 37 degrees C for the maximal ET with all handwear configurations; for each lower ambient condition, steady-state Tre dropped -0.2 degrees C per each 10 C decrease in Ta.Tmf at or near 5 degrees C prior to the maximal ET was the basis for premature attrition; Tsk of 29.4 degrees C was associated with subjective thermal discomfort. ET was predicted adequately by combining Tmf, heat production, Tre and Tsk. CONCLUSIONS: The ECWCS with specific handwear furnish adequate ET in cold-dry ambients provided that ventilation and removal of extra layers is an option during heavy exercise and thermal insulation is not decreased by body moisture. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/9819165/Thermoregulatory_responses_to_cold:_effects_of_handwear_with_multi_layered_clothing_ L2 - https://medlineplus.gov/exerciseandphysicalfitness.html DB - PRIME DP - Unbound Medicine ER -