Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic.
This study examined the impact of prolonged physical activity in a cold environment on circulating thyroid hormone levels. A secondary focus of the study involved the role of nocturnal habitat upon the thyroidal responses to the physical activity and cold exposure. Military personnel exposed to 10 d...
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ftdtic:ADA252720 2023-05-15T14:48:14+02:00 Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. Hackney, A. C. Hodgdon, J. A. NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA 1991-12-20 text/html http://www.dtic.mil/docs/citations/ADA252720 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA252720 en eng http://www.dtic.mil/docs/citations/ADA252720 Approved for public release; distribution is unlimited. DTIC AND NTIS Medicine and Medical Research *MILITARY PERSONNEL *HORMONES *THYROID HORMONES ENVIRONMENTS IMPACT SECONDARY PROTEINS REGIONS RESPONSE OPERATION PERSONNEL WORK NORWAY HABITATS HYPOTHERMIA BLOOD ARCTIC REGIONS GLOBULINS PE63706N Text 1991 ftdtic 2016-02-22T12:58:26Z This study examined the impact of prolonged physical activity in a cold environment on circulating thyroid hormone levels. A secondary focus of the study involved the role of nocturnal habitat upon the thyroidal responses to the physical activity and cold exposure. Military personnel exposed to 10 days of field-based operations in the arctic region of Norway were studied. Blood samples were collected before (day 1), and at days 5 and 10 of the operations. Levels of total T4, free T4, total T3, free T3, and thyroid binding globulin were assessed in all blood samples. The results indicated considerable significant (p < 0.05) decreases in total thyroid hormone levels, while relative increases on free fractions of the hormones occur with the 10 days of operations in the arctic. However, no significant influence on thyroidal responses were observed due to the nocturnal habitat that the subjects lived in. The hormonal alterations noted are possibly brought about by the combined effects of physical activity and cold exposure acting synergistically to alter thyroid physiology (e.g., most likely the protein carrier binding affinity). Prolonged physical work, Hypothermia, Endocrine. Text Arctic Defense Technical Information Center: DTIC Technical Reports database Arctic Norway |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Medicine and Medical Research *MILITARY PERSONNEL *HORMONES *THYROID HORMONES ENVIRONMENTS IMPACT SECONDARY PROTEINS REGIONS RESPONSE OPERATION PERSONNEL WORK NORWAY HABITATS HYPOTHERMIA BLOOD ARCTIC REGIONS GLOBULINS PE63706N |
spellingShingle |
Medicine and Medical Research *MILITARY PERSONNEL *HORMONES *THYROID HORMONES ENVIRONMENTS IMPACT SECONDARY PROTEINS REGIONS RESPONSE OPERATION PERSONNEL WORK NORWAY HABITATS HYPOTHERMIA BLOOD ARCTIC REGIONS GLOBULINS PE63706N Hackney, A. C. Hodgdon, J. A. Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. |
topic_facet |
Medicine and Medical Research *MILITARY PERSONNEL *HORMONES *THYROID HORMONES ENVIRONMENTS IMPACT SECONDARY PROTEINS REGIONS RESPONSE OPERATION PERSONNEL WORK NORWAY HABITATS HYPOTHERMIA BLOOD ARCTIC REGIONS GLOBULINS PE63706N |
description |
This study examined the impact of prolonged physical activity in a cold environment on circulating thyroid hormone levels. A secondary focus of the study involved the role of nocturnal habitat upon the thyroidal responses to the physical activity and cold exposure. Military personnel exposed to 10 days of field-based operations in the arctic region of Norway were studied. Blood samples were collected before (day 1), and at days 5 and 10 of the operations. Levels of total T4, free T4, total T3, free T3, and thyroid binding globulin were assessed in all blood samples. The results indicated considerable significant (p < 0.05) decreases in total thyroid hormone levels, while relative increases on free fractions of the hormones occur with the 10 days of operations in the arctic. However, no significant influence on thyroidal responses were observed due to the nocturnal habitat that the subjects lived in. The hormonal alterations noted are possibly brought about by the combined effects of physical activity and cold exposure acting synergistically to alter thyroid physiology (e.g., most likely the protein carrier binding affinity). Prolonged physical work, Hypothermia, Endocrine. |
author2 |
NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA |
format |
Text |
author |
Hackney, A. C. Hodgdon, J. A. |
author_facet |
Hackney, A. C. Hodgdon, J. A. |
author_sort |
Hackney, A. C. |
title |
Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. |
title_short |
Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. |
title_full |
Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. |
title_fullStr |
Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. |
title_full_unstemmed |
Thyroid Hormone Changes during Military Field Operations: Effects of Cold Exposure in the Arctic. |
title_sort |
thyroid hormone changes during military field operations: effects of cold exposure in the arctic. |
publishDate |
1991 |
url |
http://www.dtic.mil/docs/citations/ADA252720 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA252720 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA252720 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766319319375937536 |