Document Detail

Nocturnal heart rate variability following supramaximal intermittent exercise.
MedLine Citation:
PMID:  20029095     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To assess the effect of supramaximal intermittent exercise on long-term cardiac autonomic activity, inferred from heart rate variability (HRV). METHODS: Eleven healthy males performed a series of two consecutive intermittent 15-s runs at 95% VIFT (i.e., speed reached at the end of the 30-15 Intermittent Fitness Test) interspersed with 15 s of active recovery at 45% VIFT until exhaustion. Beat-to-beat intervals were recorded during two consecutive nights (habituation night and 1st night) before, 10 min before and immediately after exercise, as well as 12 h (2nd night) and 36 h (3rd night) after supramaximal intermittent exercise. The HRV indices were calculated from the last 5 min of resting and recovery periods, and the first 10 min of the first estimated slow wave sleep period. RESULTS: Immediate post-supramaximal exercise vagal-related HRV indices were significantly lower than immediate pre-supramaximal exercise values (P < .001). Most vagal-related indices were lower during the 2nd night compared with the 1st night (eg, mean RR intervals, P = .03). Compared with the 2nd night, vagal-related HRV indices were significantly higher during the 3rd night. Variables were not different between the 1st and 3rd nights; however, we noted a tendency (adjusted effect size, aES) for an increased normalized high-frequency component (P = .06 and aES = 0.70) and a tendency toward a decreased low-frequency component (P = .06 and aES = 0.74). CONCLUSION: Results confirm the strong influence of exercise intensity on short- and long-term postexercise heart rate variability recovery and might help explain the high efficiency of supramaximal training for enhancing indices of cardiorespiratory fitness.
Hani Al Haddad; Paul B Laursen; Said Ahmaidi; Martin Buchheit
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  4     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-12-23     Completed Date:  2010-03-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  United States    
Other Details:
Languages:  eng     Pagination:  435-47     Citation Subset:  IM    
Laboratoire de Recherche, EA 3300, Facult? des Sciences du Sport, Universit? de Picardie Jules Verne, Amiens, France.
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MeSH Terms
Autonomic Nervous System / physiology
Heart Rate / physiology*
Lactic Acid / blood
Oxygen Consumption / physiology
Physical Education and Training / methods*
Physical Endurance / physiology
Pulmonary Gas Exchange / physiology
Reg. No./Substance:
50-21-5/Lactic Acid

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