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Cardiac autonomic dysfunction in chronic stroke women is attenuated after submaximal exercise test, as evaluated by linear and nonlinear analysis.

Francica JV, Bigongiari A, Mochizuki L, Scapini KB, Moraes OA, Mostarda C, Caperuto EC, Irigoyen MC, De Angelis K, Rodrigues B - BMC Cardiovasc Disord (2015)

Bottom Line: C = 34 ± 3 ms), decreased high frequency band of pulse interval (S = 8.4 ± 2 vs. 33.1 ± 9 %) and 2V pattern of symbolic analysis (S = 17.3 ± 1 vs. 30 ± 3 %) (both indicators of cardiac vagal modulation) when compared to C group.At recovery time, all HRV parameters in time and frequency domains improved in the S group; however, HF band remained lower when compared to C group.These results reinforce the importance of a physically active lifestyle for cardiovascular autonomic disorders observed in chronic stroke women.

View Article: PubMed Central - PubMed

Affiliation: Human Movement Laboratory, São Judas Tadeu University (USJT), São Paulo/SP, Brazil. prof.julianavalente@gmail.com.

ABSTRACT

Background: We evaluated cardiac autonomic modulation in women with chronic ischemic stroke (at least 4 years post-stroke) at rest and in response to submaximal exercise test.

Methods: Fourteen post-stroke women (S group) and 10 healthy women (C group) participated in this study. Autonomic modulation (using linear and nonlinear analysis), blood pressure and metabolic variables at rest were evaluated immediately after the exercise test and during the recovery period (20 min). All participants underwent submaximal exercise test on cycle ergometer with gas analysis.

Results: At rest, the S group displayed higher lactate concentration, systolic (SBP) and diastolic blood pressure (DBP) values when compared to C group. Furthermore, the S group had lower heart rate variability (HRV) in time domain (SDNN: S = 30 ± 5 vs. 40 ± 8 ms; rMSSD: S = 14 ± 2 vs. C = 34 ± 3 ms), decreased high frequency band of pulse interval (S = 8.4 ± 2 vs. 33.1 ± 9 %) and 2V pattern of symbolic analysis (S = 17.3 ± 1 vs. 30 ± 3 %) (both indicators of cardiac vagal modulation) when compared to C group. Immediately after exercise, S group presented higher values of lactate, SBP, DBP and double product when compared to C group, as well as decreased heart rate recovery (HRR) measured at the first, second and third minutes. At recovery time, all HRV parameters in time and frequency domains improved in the S group; however, HF band remained lower when compared to C group.

Conclusions: After the exercise test, women with chronic stroke presented reduced heart rate variability, reduced cardiac vagal modulation, as well as reduced HRR, while displayed an improvement of heart rate variability and cardiac vagal modulation when compared to their baseline. These results reinforce the importance of a physically active lifestyle for cardiovascular autonomic disorders observed in chronic stroke women.

No MeSH data available.


Related in: MedlinePlus

Autonomic balance (LF/HF ratio) in the Control (C) and Stroke (S) groups. *P < 0.05 vs. C at same time evaluation; †P < 0.05 vs. baseline in the same group
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Fig2: Autonomic balance (LF/HF ratio) in the Control (C) and Stroke (S) groups. *P < 0.05 vs. C at same time evaluation; †P < 0.05 vs. baseline in the same group

Mentions: In frequency domain (Table 4) at baseline evaluation, the S group had a decrease in HF band (absolute and normalized values) when compared to the C group. Throughout the recovery period, the S group displayed increased LF band (absolute and normalized values) and HF band (absolute and normalized values) when compared to the baseline evaluation. However, despite the increase in HF band in the S group, these values remained lower than those found for the C group. Similarly, LF/HF ratio was increased in S group when compared to C, both at baseline (2.3 ± 0.3 vs. 0.9 ± 0.2), and during recovery (1.5 ± 0.1 vs. 0.6 ± 0.1). However, it should be noted that the LF/HF ratio was reduced in S group when compared to the baseline evaluation (Fig. 2).Fig. 2


Cardiac autonomic dysfunction in chronic stroke women is attenuated after submaximal exercise test, as evaluated by linear and nonlinear analysis.

Francica JV, Bigongiari A, Mochizuki L, Scapini KB, Moraes OA, Mostarda C, Caperuto EC, Irigoyen MC, De Angelis K, Rodrigues B - BMC Cardiovasc Disord (2015)

Autonomic balance (LF/HF ratio) in the Control (C) and Stroke (S) groups. *P < 0.05 vs. C at same time evaluation; †P < 0.05 vs. baseline in the same group
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4587902&req=5

Fig2: Autonomic balance (LF/HF ratio) in the Control (C) and Stroke (S) groups. *P < 0.05 vs. C at same time evaluation; †P < 0.05 vs. baseline in the same group
Mentions: In frequency domain (Table 4) at baseline evaluation, the S group had a decrease in HF band (absolute and normalized values) when compared to the C group. Throughout the recovery period, the S group displayed increased LF band (absolute and normalized values) and HF band (absolute and normalized values) when compared to the baseline evaluation. However, despite the increase in HF band in the S group, these values remained lower than those found for the C group. Similarly, LF/HF ratio was increased in S group when compared to C, both at baseline (2.3 ± 0.3 vs. 0.9 ± 0.2), and during recovery (1.5 ± 0.1 vs. 0.6 ± 0.1). However, it should be noted that the LF/HF ratio was reduced in S group when compared to the baseline evaluation (Fig. 2).Fig. 2

Bottom Line: C = 34 ± 3 ms), decreased high frequency band of pulse interval (S = 8.4 ± 2 vs. 33.1 ± 9 %) and 2V pattern of symbolic analysis (S = 17.3 ± 1 vs. 30 ± 3 %) (both indicators of cardiac vagal modulation) when compared to C group.At recovery time, all HRV parameters in time and frequency domains improved in the S group; however, HF band remained lower when compared to C group.These results reinforce the importance of a physically active lifestyle for cardiovascular autonomic disorders observed in chronic stroke women.

View Article: PubMed Central - PubMed

Affiliation: Human Movement Laboratory, São Judas Tadeu University (USJT), São Paulo/SP, Brazil. prof.julianavalente@gmail.com.

ABSTRACT

Background: We evaluated cardiac autonomic modulation in women with chronic ischemic stroke (at least 4 years post-stroke) at rest and in response to submaximal exercise test.

Methods: Fourteen post-stroke women (S group) and 10 healthy women (C group) participated in this study. Autonomic modulation (using linear and nonlinear analysis), blood pressure and metabolic variables at rest were evaluated immediately after the exercise test and during the recovery period (20 min). All participants underwent submaximal exercise test on cycle ergometer with gas analysis.

Results: At rest, the S group displayed higher lactate concentration, systolic (SBP) and diastolic blood pressure (DBP) values when compared to C group. Furthermore, the S group had lower heart rate variability (HRV) in time domain (SDNN: S = 30 ± 5 vs. 40 ± 8 ms; rMSSD: S = 14 ± 2 vs. C = 34 ± 3 ms), decreased high frequency band of pulse interval (S = 8.4 ± 2 vs. 33.1 ± 9 %) and 2V pattern of symbolic analysis (S = 17.3 ± 1 vs. 30 ± 3 %) (both indicators of cardiac vagal modulation) when compared to C group. Immediately after exercise, S group presented higher values of lactate, SBP, DBP and double product when compared to C group, as well as decreased heart rate recovery (HRR) measured at the first, second and third minutes. At recovery time, all HRV parameters in time and frequency domains improved in the S group; however, HF band remained lower when compared to C group.

Conclusions: After the exercise test, women with chronic stroke presented reduced heart rate variability, reduced cardiac vagal modulation, as well as reduced HRR, while displayed an improvement of heart rate variability and cardiac vagal modulation when compared to their baseline. These results reinforce the importance of a physically active lifestyle for cardiovascular autonomic disorders observed in chronic stroke women.

No MeSH data available.


Related in: MedlinePlus