Document Detail

Use of heart rate variability to estimate LT and VT.
MedLine Citation:
PMID:  18213538     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine if changes in heart rate variability during incremental exercise could be used to estimate lactate threshold and ventilatory threshold in healthy adults. Twenty-four adults performed graded maximal cycle ergometry to volitional fatigue. Blood lactate, heart rate, RR interval, and respiratory gas exchange were monitored. Heart rate variability was analyzed using time domain indices (standard deviation and mean successive difference). A marked RR interval deflection point was found in the region of lactate threshold and ventilatory threshold, and was identified as the heart rate variability threshold. Mean differences between heart rate variability threshold, ventilatory threshold, and lactate threshold ranged from 0.06 +/- 0.3 to 0.12 +/- 0.2 L.min (-1). Correlations between the different measures ranged from 0.82 - 0.89. A small but significant difference was found between ventilatory threshold and lactate threshold (p < 0.05). There was not a significant difference between heart rate variability threshold and lactate threshold (p > 0.05), nor between heart rate variability threshold and ventilatory threshold (p > 0.05). The data suggest the heart rate variability threshold coincides with lactate threshold and ventilatory threshold during graded exercise and can be used for the detection of lactate threshold in healthy adults.
G K Karapetian; H J Engels; R J Gretebeck
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Publication Detail:
Type:  Journal Article     Date:  2008-01-22
Journal Detail:
Title:  International journal of sports medicine     Volume:  29     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-07-22     Completed Date:  2008-12-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  652-7     Citation Subset:  IM    
Kinesiology, Health & Sport Studies, Wayne State University, Detroit, Michigan 48202, USA.
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MeSH Terms
Anaerobic Threshold*
Exercise / physiology*
Exercise Test
Heart Rate / physiology*
Lactates / blood*
Oxygen Consumption / physiology
Pulmonary Gas Exchange
Reg. No./Substance:

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

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