Heart rate responses during isometric exercises in patients undergoing a phase III cardiac rehabilitation program.
In: Brazilian Journal of Physical Therapy, Jg. 14 (2010-09-01), Heft 5, S. 383-389
Online
academicJournal
Zugriff:
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 (ÃHR) 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: ÃHR 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 ÃHR 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. [ABSTRACT FROM AUTHOR]
Titel: |
Heart rate responses during isometric exercises in patients undergoing a phase III cardiac rehabilitation program.
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Autor/in / Beteiligte Person: | Leite, PH ; Melo, RC ; Mello, MF ; da Silva E ; Borghi-Silva, A ; Catai, AM |
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Zeitschrift: | Brazilian Journal of Physical Therapy, Jg. 14 (2010-09-01), Heft 5, S. 383-389 |
Veröffentlichung: | 2010 |
Medientyp: | academicJournal |
ISSN: | 1413-3555 (print) |
DOI: | dx.doi.org/S1413-35552010000500006 |
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