1
|
Buto MSS, Catai AM, Vassimon-Barroso V, Gois MO, Porta A, Takahashi ACM. Baroreflex sensitivity in frailty syndrome. ACTA ACUST UNITED AC 2019; 52:e8079. [PMID: 30970083 PMCID: PMC6459464 DOI: 10.1590/1414-431x20198079] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 01/08/2019] [Indexed: 11/21/2022]
Abstract
Frailty is related to a decrease in the physiological reserves, which causes difficulties in maintaining homeostasis. An example of physiological mechanisms for cardiovascular homeostasis is the baroreflex. The aim of this study was to compare baroreflex among frail, prefrail, and nonfrail individuals, in supine and orthostatic positions. Community-dwelling older adults were evaluated and categorized into frail, prefrail, or nonfrail groups, according to frailty phenotype. The RR interval (RRi) and systolic blood pressure (SBP) series were recorded for 15 min in the supine and 15 min in the orthostatic positions. Mean and variance of RRi and SBP, and baroreflex evaluated by phase, gain (α), and coherence (K2) were determined. A two-way repeated measures ANOVA, with Tukey's post hoc, was applied for group, position, and their interaction effects. The significance level established was 5%. Prefrail and frail participants did not present a significant decrease in mean values of RRi after postural challenge (893.43 to 834.20 ms and 925.99 to 857.98 ms, respectively). Frail participants showed a reduction in RRi variance in supine to orthostatic (852.04 to 232.37 ms2). Prefrail and frail participants showed a decrease in K2 after postural change (0.69 to 0.52 and 0.54 to 0.34, respectively). Frail participants exhibited lower values of K2 (0.34) compared to nonfrail and prefrail participants (0.61 and 0.52, respectively). Baroreflex indicated the presence of decoupling between heart period and SBP in frail and prefrail. Thus, reduced K2 might be a marker of the frailty process.
Collapse
Affiliation(s)
- M S S Buto
- Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - A M Catai
- Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - V Vassimon-Barroso
- Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - M O Gois
- Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - A Porta
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.,Department of Cardiothoracic, Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
| | - A C M Takahashi
- Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| |
Collapse
|
2
|
Sun P, Yan H, Ranadive SM, Lane AD, Kappus RM, Bunsawat K, Baynard T, Hu M, Li S, Fernhall B. Autonomic Recovery Is Delayed in Chinese Compared with Caucasian following Treadmill Exercise. PLoS One 2016; 11:e0147104. [PMID: 26784109 PMCID: PMC4718672 DOI: 10.1371/journal.pone.0147104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 11/18/2015] [Indexed: 11/30/2022] Open
Abstract
UNLABELLED Caucasian populations have a higher prevalence of cardiovascular disease (CVD) when compared with their Chinese counterparts and CVD is associated with autonomic function. It is unknown whether autonomic function during exercise recovery differs between Caucasians and Chinese. The present study investigated autonomic recovery following an acute bout of treadmill exercise in healthy Caucasians and Chinese. Sixty-two participants (30 Caucasian and 32 Chinese, 50% male) performed an acute bout of treadmill exercise at 70% of heart rate reserve. Heart rate variability (HRV) and baroreflex sensitivity (BRS) were obtained during 5-min epochs at pre-exercise, 30-min, and 60-min post-exercise. HRV was assessed using frequency [natural logarithm of high (LnHF) and low frequency (LnLF) powers, normalized high (nHF) and low frequency (nLF) powers, and LF/HF ratio] and time domains [Root mean square of successive differences (RMSSD), natural logarithm of RMSSD (LnRMSSD) and R-R interval (RRI)]. Spontaneous BRS included both up-up and down-down sequences. At pre-exercise, no group differences were observed for any HR, HRV and BRS parameters. During exercise recovery, significant race-by-time interactions were observed for LnHF, nHF, nLF, LF/HF, LnRMSSD, RRI, HR, and BRS (up-up). The declines in LnHF, nHF, RMSSD, RRI and BRS (up-up) and the increases in LF/HF, nLF and HR were blunted in Chinese when compared to Caucasians from pre-exercise to 30-min to 60-min post-exercise. Chinese exhibited delayed autonomic recovery following an acute bout of treadmill exercise. This delayed autonomic recovery may result from greater sympathetic dominance and extended vagal withdrawal in Chinese. TRIAL REGISTRATION Chinese Clinical Trial Register ChiCTR-IPR-15006684.
Collapse
Affiliation(s)
- Peng Sun
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, East China Normal University, Shanghai, China
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Huimin Yan
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Sushant M. Ranadive
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Abbi D. Lane
- College of Applied Health Sciences, University of Illinois, Chicago, Illinois, United States of America
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Rebecca M. Kappus
- College of Applied Health Sciences, University of Illinois, Chicago, Illinois, United States of America
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Kanokwan Bunsawat
- College of Applied Health Sciences, University of Illinois, Chicago, Illinois, United States of America
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Tracy Baynard
- College of Applied Health Sciences, University of Illinois, Chicago, Illinois, United States of America
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| | - Min Hu
- Guangzhou Institute of Physical Education, Guangzhou, China
| | - Shichang Li
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, East China Normal University, Shanghai, China
| | - Bo Fernhall
- College of Applied Health Sciences, University of Illinois, Chicago, Illinois, United States of America
- Exercise and Cardiovascular Research Laboratory, Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, Illinois, United States of America
| |
Collapse
|