Abstract
Previous investigations show that metabolic syndrome (MetSyn) causes sympathetic hyperactivation. Symptoms of anxiety and mood disturbance (AMd) provoke sympatho-vagal imbalance. We hypothesized that AMd would alter even further the autonomic function in patients with MetSyn. Twenty-six never-treated patients with MetSyn (ATP-III) were allocated to two groups, according to the levels of anxiety and mood disturbance: (1) with AMd (MetSyn + AMd, n = 15), and (2) without AMd (MetSyn, n = 11). Ten healthy control subjects were also studied (C, n = 10). AMd was determined using quantitative questionnaires. Muscle sympathetic nerve activity (MSNA, microneurography), blood pressure (oscillometric beat-to-beat basis), and heart rate (ECG) were measured during a baseline 10-min period. Spectral analysis of RR interval and systolic arterial pressure were analyzed, and the power of low (LF) and high (HF) frequency bands were determined. Sympatho-vagal balance was obtained by LF/HF ratio. Spontaneous baroreflex sensitivity (BRS) was evaluated by calculation of α-index. MSNA was greater in patients with MetSyn + AMd compared with MetSyn and C. Patients with MetSyn + AMd showed higher LF and lower HF power compared with MetSyn and C. In addition, LF/HF balance was higher in MetSyn + AMd than in MetSyn and C groups. BRS was decreased in MetSyn + AMd compared with MetSyn and C groups. Anxiety and mood disturbance alter autonomic function in patients with MetSyn. This autonomic dysfunction may contribute to the increased cardiovascular risk observed in patients with mood alterations.
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Abbreviations
- AMd:
-
Anxiety and mood disturbance
- BMI:
-
Body mass index
- BP:
-
Blood pressure
- BRS:
-
Baroreflex sensitivity
- HF:
-
High frequency
- k 2 :
-
Coherence
- LF:
-
Low frequency
- LF/HF:
-
Sympatho-vagal balance
- MetSyn:
-
Metabolic syndrome
- MSN:
-
Muscle sympathetic nerve activity
- n.u.:
-
Normalized unit
- pNN50:
-
Percent of successive RR interval differences >50 ms
- POM:
-
Profile of mood states
- rMSSD:
-
Root mean squares successive differences of RR intervals
- RRI:
-
RR interval
- SAP:
-
Systolic arterial pressure
- SDNN:
-
Standard deviation of RR intervals
- STAI:
-
State and trait anxiety inventory
- TMD:
-
Total mood disturbance
- VLF:
-
Very low frequency
- φ:
-
Phase shift
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Acknowledgments
This study was supported by Conselho Nacional de Pesquisa (CNPq # 476385/2006-7), by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP # 2010/50048-1) and, in part, by Fundação Zerbini. Toschi-Dias E, Negrão CE and Rondon MUPB were supported by Conselho Nacional de Pesquisa (CNPq # 140643/2009-5, # 301867/2010-0, # 308068/2011-4, respectively). Trombetta IC was supported by Fundação de Amparo à Pesquisa (FAPESP # 2008/03714-6). Maki-Nunes C and Martinez DG were supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
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The authors declared no conflict of interest.
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Communicated by Dag Linnarsson.
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Toschi-Dias, E., Trombetta, I.C., da Silva, V.J.D. et al. Symptoms of anxiety and mood disturbance alter cardiac and peripheral autonomic control in patients with metabolic syndrome. Eur J Appl Physiol 113, 671–679 (2013). https://doi.org/10.1007/s00421-012-2476-8
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DOI: https://doi.org/10.1007/s00421-012-2476-8