Document Detail

Natural killer cell response to exercise in humans: effect of hypoxia and epidural anesthesia.
MedLine Citation:
PMID:  7759444     Owner:  NLM     Status:  MEDLINE    
For the response of immunologically competent blood cells to exercise, the importance of afferent nerve impulses was evaluated. On separate days, seven males cycled in a recumbent position approximately 60% of maximal O2 uptake with and without sensory nerve blockade by lumbar epidural anesthesia. Blood samples were collected after 60 min of rest, 20 min of exercise, and 120 min postexercise. Subsequently, on each day, the subjects were exposed to 11.5% O2-88.5% N2 for 10 min. This was followed by 20 min of hypoxic exercise at the same work rate, and a final blood sample was obtained. The concentrations of lymphocytes expressing the cluster designation (CD) cell-surface antigens CD3, CD4, CD8, and CD14 became elevated during exercise, and these responses were enhanced by hypoxia (P < or = 0.01). The most pronounced changes were within the concentrations of CD16+ and CD56+ natural killer cells, which increased twofold during normoxic and fivefold during hypoxic exercise (P < or = 0.01). Sensory nerve blockade decreased the number of CD3+ and CD4+ cells and increased the percentage of CD16+ cells, independent of exercise and hypoxia (P < or = 0.05). Sensory nerve blockade caused minor enhancement in the increase of unstimulated natural killer cell activity during exercise (P = 0.07) and enhanced the interferon-alpha-stimulated activity at normoxia (P < or = 0.05), whereas no effect was detected at hypoxia. The results demonstrate that the responses of immunological competent cells to normoxic and hypoxic exercise are not abolished by blockade of nerve impulses from active muscle.
M Klokker; M Kjaer; N H Secher; B Hanel; L Worm; M Kappel; B K Pedersen
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  78     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-06-29     Completed Date:  1995-06-29     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  709-16     Citation Subset:  IM; S    
Department of Infectious Diseases, Rigshospitalet, Copenhagen, Denmark.
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MeSH Terms
Anesthesia, Epidural*
Anoxia / blood*,  immunology
Antigens, Surface / analysis
Exercise / physiology*
Flow Cytometry
Interferon-alpha / pharmacology
Killer Cells, Natural / immunology,  physiology*
Leukocyte Count
Lymphocyte Count
Neurons, Afferent / physiology
beta-Endorphin / blood
Reg. No./Substance:
0/Antigens, Surface; 0/Interferon-alpha; 60617-12-1/beta-Endorphin

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