Document Detail

Heart rate responses during isometric exercises in patients undergoing a phase III cardiac rehabilitation program.
MedLine Citation:
PMID:  21180863     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: the magnitude of cardiovascular responses is dependent on the static and dynamic components as well as the duration and intensity of the contraction performed.
OBJECTIVE: to evaluate the heart rate responses to different percentages of isometric contractions in 12 patients (63 ± 11.6 years) with coronary artery disease and/or risk factors for coronary artery disease that were participating in a phase III cardiac rehabilitation program.
METHODS: heart rate variation (ΔHR) was evaluated during maximum (MVC, five and ten seconds in duration) and submaximal (SMVC, 30 and 60% of MVC-5, until muscle exhaustion) voluntary contraction, using a handgrip dynamometer. Additionally, the representative index of cardiac vagal modulation (RMSSD index) was calculated at rest (pre-contraction), at the final 30 seconds of SMVC and during recovery (post-contraction).
RESULTS: ΔHR showed higher values in MVC-10 versus MVC-5 (17 ± 5.5 vs 12 ± 4.2 bpm, p<0.05) and the SMVC-60 vs SMVC-30 (19 ± 5.8 vs 15 ± 5.1 bpm, p<0.05). However, results for CVM-10 showed similar ΔHR compared to results for CVSM (p> 0.05). RICVM at rest decreased (p<0.05) during SMVC-30 (30% = 27.9 ± 17.1 vs 12.9 ± 8.5 ms) and SMVC-60 (60% =25.8 ± 18.2 vs 9.96 ± 4.2 ms), but returned to the baseline values when the contraction was interrupted.
CONCLUSIONS: in patients with coronary artery disease and/or risk factors for coronary heart disease, low intensity isometric contraction, maintained over long periods of time, presents the same effect on the responses of HR, compared to a high intensity or maximal isometric contraction of briefly duration.
Poliana H Leite; Ruth C Melo; Marcelo F Mello; Ester da Silva; Audrey Borghi-Silva; Aparecida M Catai
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Revista brasileira de fisioterapia (São Carlos (São Paulo, Brazil))     Volume:  14     ISSN:  -     ISO Abbreviation:  Rev Bras Fisioter     Publication Date:    2010 Sep-Oct
Date Detail:
Created Date:  2010-12-24     Completed Date:  2011-06-06     Revised Date:  2013-08-21    
Medline Journal Info:
Nlm Unique ID:  101186153     Medline TA:  Rev Bras Fisioter     Country:  Brazil    
Other Details:
Languages:  eng; por     Pagination:  383-9     Citation Subset:  IM    
Physical Therapy Departament, Laboratory of Cardiovascular Physical Therapy, Nuclear Research in Physical Exercise, São Carlos, São Carlos, SP, Brasil.
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MeSH Terms
Coronary Artery Disease / physiopathology,  rehabilitation*
Exercise / physiology*
Heart Rate*
Middle Aged
Risk Factors

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