Document Detail


Evaluation of stress responses to interval training at low and moderate altitudes.
MedLine Citation:
PMID:  12569215     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The purpose of the present field study was to explore whether extensive interval training (IT) performed with a similar behavior of blood lactate (LA) at an altitude of 1800 m (ALT) and near sea level (SL) goes along with a comparable hormonal, metabolic, and acute phase response in highly trained endurance athletes. METHODS: Twelve distance runners (VO2 64.6 +/- 6.9 mL.kg(-1) ) performed IT (10 x 1000 m, 2-min rest) at SL with a running velocity (V) corresponding to 112% of the individual anaerobic threshold (IAT). After an acclimatization period of 7 d, IT was repeated with a lower V (107% IAT) at ALT. Blood samples were drawn at rest, 0, 0.3, 3, and 24 h after IT. LA during IT was similar at SL and ALT (5.4 +/- 1.3/5.3 +/- 1.2 mmol.L(-1)), whereas HR tended to be higher at SL. RESULTS: Postexercise rises in plasma noradrenaline (NA), NA sulfate, adrenaline, glucose, interleukin-6 (IL-6), and neutrophils were significantly more pronounced at ALT. The increase of cortisol and human growth hormone showed an insignificant trend toward higher values at ALT. A slight but significant increase of plasma erythropoietin was only apparent after IT at ALT. No differences between either condition were observed for exercise-related changes in free fatty acids, IL-8, lympho-, or monocyte counts. CONCLUSIONS: In spite of a matched accumulation pattern of LA between ALT and N, stress responses, such as sympathetic activation and hepatic glucose release, still appear to be greater at ALT. This additional impact of moderate ALT on the stress response to IT should be taken into account if repeated training sessions are performed within a short period of time.
Authors:
Andreas Michael Niess; Elvira Fehrenbach; Gunther Strobel; Kai Roecker; Elisabeth Marion Schneider; Julia Buergler; Simone Fuss; Rainer Lehmann; Hinnak Northoff; Hans-Hermann Dickhuth
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  35     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-02-05     Completed Date:  2003-05-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  263-9     Citation Subset:  IM; S    
Affiliation:
Center of Internal Medicine, Department of Rehabilitative and Preventive Sports Medicine, University of Freiburg, Freiburg, Germany. niess@msml.ukl.uni-freiburg.de
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MeSH Terms
Descriptor/Qualifier:
Adult
Altitude*
Cytokines / blood
Female
Glucose / metabolism
Humans
Hydrocortisone / blood*
Lactic Acid / blood*
Male
Norepinephrine / blood
Physical Endurance*
Running / physiology*
Stress, Psychological*
Chemical
Reg. No./Substance:
0/Cytokines; 50-21-5/Lactic Acid; 50-23-7/Hydrocortisone; 50-99-7/Glucose; 51-41-2/Norepinephrine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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