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Muscle sympathetic nerve activity during cold stress and isometric exercise in healthy older adults

Cardiovascular mortality increases in cold weather in older adults, and physical activity may impart even greater cardiovascular risk than cold exposure alone. Human aging is associated with exaggerated pressor responses to whole body cooling; however, the sympathetic response to cold stress alone a... Full description

Journal Title: Journal of applied physiology (Bethesda Md. : 1985), 15 September 2014, Vol.117(6), pp.648-57
Main Author: Greaney, Jody L
Other Authors: Stanhewicz, Anna E , Kenney, W Larry , Alexander, Lacy M
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1522-1601 ; PMID: 25103970 Version:1 ; DOI: 10.1152/japplphysiol.00516.2014
Link: http://pubmed.gov/25103970
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recordid: medline25103970
title: Muscle sympathetic nerve activity during cold stress and isometric exercise in healthy older adults
format: Article
creator:
  • Greaney, Jody L
  • Stanhewicz, Anna E
  • Kenney, W Larry
  • Alexander, Lacy M
subjects:
  • Aging
  • Blood Pressure
  • Handgrip
  • Whole Body Cooling
  • Cold Temperature -- Adverse Effects
  • Exercise -- Physiology
  • Muscle, Skeletal -- Innervation
  • Stress, Physiological -- Physiology
  • Sympathetic Nervous System -- Physiology
ispartof: Journal of applied physiology (Bethesda, Md. : 1985), 15 September 2014, Vol.117(6), pp.648-57
description: Cardiovascular mortality increases in cold weather in older adults, and physical activity may impart even greater cardiovascular risk than cold exposure alone. Human aging is associated with exaggerated pressor responses to whole body cooling; however, the sympathetic response to cold stress alone and in combination with isometric exercise is unknown. We hypothesized that cold stress would 1) increase muscle sympathetic nerve activity (MSNA) and 2) augment the MSNA response to isometric handgrip in older adults. Whole body cooling (water-perfused suit) was conducted in 11 young (23 ± 1 yr) and 12 healthy older adults (60 ± 2 yr). Blood pressure (BP; Finometer) and MSNA (microneurography) were measured throughout cooling and during isometric handgrip at 30% maximal voluntary contraction performed at a mean skin temperature (Tsk) of 34 and 30.5°C. MSNA was greater in older adults at Tsk = 34.0°C and throughout cooling (P < 0.05). MSNA increased during cooling in older, but not young, adults...
language: eng
source:
identifier: E-ISSN: 1522-1601 ; PMID: 25103970 Version:1 ; DOI: 10.1152/japplphysiol.00516.2014
fulltext: fulltext
issn:
  • 15221601
  • 1522-1601
url: Link


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titleMuscle sympathetic nerve activity during cold stress and isometric exercise in healthy older adults
creatorGreaney, Jody L ; Stanhewicz, Anna E ; Kenney, W Larry ; Alexander, Lacy M
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subjectAging ; Blood Pressure ; Handgrip ; Whole Body Cooling ; Cold Temperature -- Adverse Effects ; Exercise -- Physiology ; Muscle, Skeletal -- Innervation ; Stress, Physiological -- Physiology ; Sympathetic Nervous System -- Physiology
descriptionCardiovascular mortality increases in cold weather in older adults, and physical activity may impart even greater cardiovascular risk than cold exposure alone. Human aging is associated with exaggerated pressor responses to whole body cooling; however, the sympathetic response to cold stress alone and in combination with isometric exercise is unknown. We hypothesized that cold stress would 1) increase muscle sympathetic nerve activity (MSNA) and 2) augment the MSNA response to isometric handgrip in older adults. Whole body cooling (water-perfused suit) was conducted in 11 young (23 ± 1 yr) and 12 healthy older adults (60 ± 2 yr). Blood pressure (BP; Finometer) and MSNA (microneurography) were measured throughout cooling and during isometric handgrip at 30% maximal voluntary contraction performed at a mean skin temperature (Tsk) of 34 and 30.5°C. MSNA was greater in older adults at Tsk = 34.0°C and throughout cooling (P < 0.05). MSNA increased during cooling in older, but not young, adults...
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descriptionCardiovascular mortality increases in cold weather in older adults, and physical activity may impart even greater cardiovascular risk than cold exposure alone. Human aging is associated with exaggerated pressor responses to whole body cooling; however, the sympathetic response to cold stress alone and in combination with isometric exercise is unknown. We hypothesized that cold stress would 1) increase muscle sympathetic nerve activity (MSNA) and 2) augment the MSNA response to isometric handgrip in older adults. Whole body cooling (water-perfused suit) was conducted in 11 young (23 ± 1 yr) and 12 healthy older adults (60 ± 2 yr). Blood pressure (BP; Finometer) and MSNA (microneurography) were measured throughout cooling and during isometric handgrip at 30% maximal voluntary contraction performed at a mean skin temperature (Tsk) of 34 and 30.5°C. MSNA was greater in older adults at Tsk = 34.0°C and throughout cooling (P < 0.05). MSNA increased during cooling in older, but not young, adults...
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abstractCardiovascular mortality increases in cold weather in older adults, and physical activity may impart even greater cardiovascular risk than cold exposure alone. Human aging is associated with exaggerated pressor responses to whole body cooling; however, the sympathetic response to cold stress alone and in combination with isometric exercise is unknown. We hypothesized that cold stress would 1) increase muscle sympathetic nerve activity (MSNA) and 2) augment the MSNA response to isometric handgrip in older adults. Whole body cooling (water-perfused suit) was conducted in 11 young (23 ± 1 yr) and 12 healthy older adults (60 ± 2 yr). Blood pressure (BP; Finometer) and MSNA (microneurography) were measured throughout cooling and during isometric handgrip at 30% maximal voluntary contraction performed at a mean skin temperature (Tsk) of 34 and 30.5°C. MSNA was greater in older adults at Tsk = 34.0°C and throughout cooling (P < 0.05). MSNA increased during cooling in older, but not young, adults...
doi10.1152/japplphysiol.00516.2014
pmid25103970
date2014-09-15