1
|
Dougherty CM, Cordoza M, Wang D, Alsoyan AH, Stein PK, Burr RL. Aerobic Exercise Improves Heart Rate Variability After an Implantable Cardioverter Defibrillator (ICD). Biol Res Nurs 2024:10998004241261273. [PMID: 38881252 DOI: 10.1177/10998004241261273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
CLINICAL TRIAL REGISTRATION Clinicaltrials.gov: NCT00522340.
Collapse
Affiliation(s)
- Cynthia M Dougherty
- Department of Biobehavioral Nursing and Health Informatics, School of Nursing, University of Washington, Seattle, WA, USA
| | - Makayla Cordoza
- School of Nursing, Vanderbilt University, Nashville, TN, USA
| | - Di Wang
- Department of Biobehavioral Nursing and Health Informatics, School of Nursing, University of Washington, Seattle, WA, USA
| | - Afnan Hamad Alsoyan
- Critical Care Nursing, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Phyllis K Stein
- Department of Medicine, Washington University, St. Louis, MO, USA
| | - Robert L Burr
- Department of Biobehavioral Nursing and Health Informatics, School of Nursing, University of Washington, Seattle, WA, USA
| |
Collapse
|
2
|
Mannozzi J, Massoud L, Stavres J, Al-Hassan MH, O’Leary DS. Altered Autonomic Function in Metabolic Syndrome: Interactive Effects of Multiple Components. J Clin Med 2024; 13:895. [PMID: 38337589 PMCID: PMC10856260 DOI: 10.3390/jcm13030895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 01/29/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024] Open
Abstract
Metabolic syndrome (MetS) describes a set of disorders that collectively influence cardiovascular health, and includes hypertension, obesity, insulin resistance, diabetes, and dyslipidemia. All these components (hypertension, obesity, dyslipidemia, and prediabetes/diabetes) have been shown to modify autonomic function. The major autonomic dysfunction that has been documented with each of these components is in the control of sympathetic outflow to the heart and periphery at rest and during exercise through modulation of the arterial baroreflex and the muscle metaboreflex. Many studies have described MetS components in singularity or in combination with the other major components of metabolic syndrome. However, many studies lack the capability to study all the factors of metabolic syndrome in one model or have not focused on studying the effects of how each component as it arises influences overall autonomic function. The goal of this review is to describe the current understanding of major aspects of metabolic syndrome that most likely contribute to the consequent/associated autonomic alterations during exercise and discuss their effects, as well as bring light to alternative mechanisms of study.
Collapse
Affiliation(s)
- Joseph Mannozzi
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI 48001, USA
| | - Louis Massoud
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI 48001, USA
| | - Jon Stavres
- School of Kinesiology and Nutrition, University of Southern Mississippi, Hattiesburg, MS 39406, USA
| | | | - Donal S. O’Leary
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI 48001, USA
| |
Collapse
|
3
|
Iellamo F. Acute responses and chronic adaptations to exercise in humans: a look from the autonomic nervous system window. J Sports Med Phys Fitness 2024; 64:137-150. [PMID: 37791830 DOI: 10.23736/s0022-4707.23.15353-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
The objective of this review was to give an overview on the current knowledge on the neural mechanisms of cardiovascular regulation during acute exercise and the autonomic adaptations brought about by chronic exercise, that is, exercise training. Evidence derived mainly from human studies, which supports the contribution of the different control mechanisms, namely the centralcommand, the reflex drive from active muscles and the arterial baroreflex, with the attendant modifications in autonomic nervous system activity, in determining the acute cardiovascular responses to exercise are discussed, along with some controversial issues and evolving concepts in exercise physiology. In particular, data that show how the various neural mechanisms involved in cardiovascular regulation during exercise are differently modulated by factors related to the muscular activity being performed, such as the type and intensity of exercise and the size of the active muscle masses are presented, stressing the plasticity of the neural network. Thereafter, the clinical implications pertaining neural cardiovascular adaptations to exercise training are presented and discussed, in the context of cardiac diseases. In particular, I will summarize a series of investigations performed in our laboratory that utilized a new training methodology and different exercise formats to quantify the training load in cardiac patients. The way by which individualized exercise training doses affects the autonomic nervous system and the cardiorespiratory adaptations is highlighted.
Collapse
Affiliation(s)
- Ferdinando Iellamo
- Department of Clinical Sciences and Translational Medicine, Tor Vergata University, Rome, Italy -
| |
Collapse
|
4
|
Notarius CF, Badrov MB, Keys E, Oh P, Floras JS. Does exercise training still augment the heart rate variability of contemporary treated heart failure patients? Clin Auton Res 2022; 32:519-522. [PMID: 36115915 DOI: 10.1007/s10286-022-00894-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 09/06/2022] [Indexed: 01/31/2023]
Affiliation(s)
- Catherine F Notarius
- Division of Cardiology, 7ES:242, Toronto General Hospital, University Health Network and Mount Sinai Hospital, 200 Elizabeth St., Toronto, ON, M5G 2C4, Canada. .,Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, ON, Canada.
| | - Mark B Badrov
- Division of Cardiology, 7ES:242, Toronto General Hospital, University Health Network and Mount Sinai Hospital, 200 Elizabeth St., Toronto, ON, M5G 2C4, Canada
| | - Evan Keys
- Division of Cardiology, 7ES:242, Toronto General Hospital, University Health Network and Mount Sinai Hospital, 200 Elizabeth St., Toronto, ON, M5G 2C4, Canada
| | - Paul Oh
- Department of Medicine, University of Toronto, Toronto, ON, Canada.,Toronto Rehabilitation Institute, University Health Network, 347 Rumsey Rd., Toronto, ON, Canada
| | - John S Floras
- Division of Cardiology, 7ES:242, Toronto General Hospital, University Health Network and Mount Sinai Hospital, 200 Elizabeth St., Toronto, ON, M5G 2C4, Canada.,Department of Medicine, University of Toronto, Toronto, ON, Canada
| |
Collapse
|
5
|
Complementary Role of Combined Indirect and Direct Cardiac Sympathetic (Hyper)Activity Assessment in Patients with Heart Failure by Spectral Analysis of Heart Rate Variability and Nuclear Imaging: Possible Application in the Evaluation of Exercise Training Effects. J Cardiovasc Dev Dis 2022; 9:jcdd9060181. [PMID: 35735810 PMCID: PMC9225187 DOI: 10.3390/jcdd9060181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 05/16/2022] [Accepted: 05/31/2022] [Indexed: 12/10/2022] Open
Abstract
In chronic heart failure (CHF), abnormalities in cardiac autonomic control, characterized by sympathetic overactivity, contribute to the progression of the disease and are associated with an unfavorable prognosis. Assessing cardiac autonomic status is clinically important in the management of patients with CHF. To this aim, heart rate variability (HRV) analysis has been extensively used as a non-invasive tool for assessing cardiac autonomic regulation, and has been shown to predict the clinical outcome in patients with CHF. Adrenergic nerve activity has also been estimated using iodine-123 (I-123) metaiodobenzylguanidine (MIBG), a noradrenaline analogue. MIBG is an analogue of norepinephrine sharing the same cellular mechanism of uptake, storage, and release in presynaptic sympathetic neurons. As an innervation tracer, 123I-MIBG allows for the evaluation of cardiac sympathetic neuronal function. Cardiac MIBG imaging has also been reported to predict a poor clinical outcome in CHF. MIBG provides direct information on the function of the presynaptic sympathetic nerve endings, whereas HRV, which depends on postsynaptic signal transduction, reflects the end-organ response of the sinus node. The aim of this brief review is to provide the reader with some basic concepts regarding the spectral analysis of HRV and MIBG, highlighting what is known about their respective roles in detecting cardiac sympathetic hyperactivity in CHF and, in perspective, their possible combined use in assessing non-pharmacological treatments in patients with CHF and reduced ejection fraction, with a particular focus on the effects of exercise training.
Collapse
|
6
|
Mannozzi J, Kim JK, Sala-Mercado JA, Al-Hassan MH, Lessanework B, Alvarez A, Massoud L, Bhatti T, Aoun K, O’Leary DS. Arterial Baroreflex Inhibits Muscle Metaboreflex Induced Increases in Effective Arterial Elastance: Implications for Ventricular-Vascular Coupling. Front Physiol 2022; 13:841076. [PMID: 35399256 PMCID: PMC8990766 DOI: 10.3389/fphys.2022.841076] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 02/18/2022] [Indexed: 01/19/2023] Open
Abstract
The ventricular-vascular relationship assesses the efficacy of energy transferred from the left ventricle to the systemic circulation and is quantified as the ratio of effective arterial elastance to maximal left ventricular elastance. This relationship is maintained during exercise via reflex increases in cardiovascular performance raising both arterial and ventricular elastance in parallel. These changes are, in part, due to reflexes engendered by activation of metabosensitive skeletal muscle afferents-termed the muscle metaboreflex. However, in heart failure, ventricular-vascular uncoupling is apparent and muscle metaboreflex activation worsens this relationship through enhanced systemic vasoconstriction markedly increasing effective arterial elastance which is unaccompanied by substantial increases in ventricular function. This enhanced arterial vasoconstriction is, in part, due to significant reductions in cardiac performance induced by heart failure causing over-stimulation of the metaboreflex due to under perfusion of active skeletal muscle, but also as a result of reduced baroreflex buffering of the muscle metaboreflex-induced peripheral sympatho-activation. To what extent the arterial baroreflex modifies the metaboreflex-induced changes in effective arterial elastance is unknown. We investigated in chronically instrumented conscious canines if removal of baroreflex input via sino-aortic baroreceptor denervation (SAD) would significantly enhance effective arterial elastance in normal animals and whether this would be amplified after induction of heart failure. We observed that effective arterial elastance (Ea), was significantly increased during muscle metaboreflex activation after SAD (0.4 ± 0.1 mmHg/mL to 1.4 ± 0.3 mmHg/mL). In heart failure, metaboreflex activation caused exaggerated increases in Ea and in this setting, SAD significantly increased the rise in Ea elicited by muscle metaboreflex activation (1.3 ± 0.3 mmHg/mL to 2.3 ± 0.3 mmHg/mL). Thus, we conclude that the arterial baroreflex does buffer muscle metaboreflex induced increases in Ea and this buffering likely has effects on the ventricular-vascular coupling.
Collapse
|
7
|
Saeidi M, Ravanbod R. Effects of resistance added on aerobic training on autonomic function in cardiac patients. Anatol J Cardiol 2022; 26:80-89. [PMID: 35190355 PMCID: PMC8878916 DOI: 10.5152/anatoljcardiol.2021.215] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2021] [Indexed: 08/16/2023] Open
Abstract
OBJECTIVE Autonomic imbalance in patients with chronic heart failure (CHF) and cardiovascular diseases (CVD) is characterized by reduced parasympathetic and enhanced sympathetic activity. Aerobic exercise improves autonomic function in patients with CHF and CVD. However, little is known about the effects of resistance training (RT) on cardiac autonomic function. Therefore, we aimed to investigate the effects of RT added on aerobic training on autonomic function in patients with CHF and CVD. DATA SOURCES The relevant clinical trials were searched in PubMed, Physiotherapy evidence Database (PEDro, Science Direct and Google Scholar databases using the following keywords, "resistance or strength training", "chronic heart failure", "coronary artery disease", "myocardial infarction", "hypertension", "cardiovascular disease", "heart rate variability (HRV)", "heart rate recovery (HRR)", "muscle sympathetic nerve activity (MSNA)", and "autonomic function". DATA SYNTHESIS Twelve articles with 323 subjects were eligible to be evaluated. The outcome measures included HRV, HRR, and MSNA. There were seven studies on CHF, two on CAD, and three studies on hypertension. Meta-analysis of all the studies showed that combined RT and aerobic training decreased MSNA significantly in patients with CHF and CAD (mean difference: -3.796; CI: -6.779 to 0.813; p=0.013; I2 =93.5%). No study evaluated the effects of RT or combined training on HRR. CONCLUSION We could not find sufficient data about the effects of RT alone on HRV and HRR, but the results showed that combined RT and aerobic training improved MSNA in patients with CHF and CAD, significantly. Further studies with similar methodological principles on the same patient population are needed.
Collapse
Affiliation(s)
- Marzieh Saeidi
- Department of Physiotherapy, Faculty of Medical Sciences, Tarbiat Modares University; Tehran-Iran
| | - Roya Ravanbod
- Department of Physiotherapy, Faculty of Medical Sciences, Tarbiat Modares University; Tehran-Iran
| |
Collapse
|
8
|
Philbois SV, Ribeiro VB, Tank J, dos Reis RM, Gerlach DA, Souza HCD. Cardiovascular autonomic modulation differences between moderate-intensity continuous and high-intensity interval aerobic training in women with PCOS: A randomized trial. Front Endocrinol (Lausanne) 2022; 13:1024844. [PMID: 36568110 PMCID: PMC9782449 DOI: 10.3389/fendo.2022.1024844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 11/07/2022] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Moderate-intensity continuous training (MICT) is strongly recommended for polycystic ovarian syndrome (PCOS) treatment. However, recent studies have suggested that high-intensity interval training (HIIT) would promote great benefits for cardiac autonomic control. Therefore, we investigated whether the benefits of HIIT related to cardiovascular autonomic control were greater than those of MICT in women with PCOS. METHODS Women with PCOS were randomly allocated through a blind draw into three groups: control, MICT, and HIIT. The control group did not undergo exercise, whereas those in the MICT and HIIT groups underwent 16 weeks of aerobic physical training. All groups were evaluated before and after the 16 weeks of intervention in the following aspects: quantification of serum lipids, testosterone, fasting insulin and blood glucose; physical fitness through cardiopulmonary testing; analysis of heart rate variability (HRV) by linear (time domain and frequency domain) and non-linear (symbolic analysis) methods, analysis of blood pressure variability (BPV) and spontaneous baroreflex sensitivity (BRS). RESULTS The final analysis, each group comprised 25 individuals. All groups had similar baseline parameters. After 16 weeks, intragroup comparison showed that the MICT and HIIT groups had a reduction in baseline heart rate (P < 0.001; P < 0.001, respectively) and testosterone levels P < 0.037; P < 0.012, respectively) associated with an increase in VO2peak (MICT, P < 0.001; HIIT, P < 0.001). The MICT (P < 0.36) and HIIT (P < 0.17) groups also showed an increase in cardiac vagal modulation, however only observed in the non-linear analysis. The intergroup comparison showed no differences between the MICT and HIIT groups in any of the hormonal, metabolic and autonomic parameters evaluated, including testosterone, peak oxygen uptake (VO2peak), HRV, BPV and BRS. CONCLUSION HIIT and MICT showed similar results for the different parameters evaluated. This suggests that both training protocols can be recommended for the treatment of PCOS. Brazilian Clinical Trials Registry (RBR-78qtwy).
Collapse
Affiliation(s)
- Stella V. Philbois
- Laboratory of Physiology and Cardiovascular Physiotherapy, Department of Science of Health, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Victor B. Ribeiro
- Department of Gynecology and Obstetrics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Jens Tank
- Department of Cardiovascular Aerospace Medicine, Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Rosana Maria dos Reis
- Department of Gynecology and Obstetrics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Darius A. Gerlach
- Department of Cardiovascular Aerospace Medicine, Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Hugo C. D. Souza
- Laboratory of Physiology and Cardiovascular Physiotherapy, Department of Science of Health, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Department of Cardiovascular Aerospace Medicine, Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
- *Correspondence: Hugo C. D. Souza,
| |
Collapse
|
9
|
Taylor JL, Bonikowske AR, Olson TP. Optimizing Outcomes in Cardiac Rehabilitation: The Importance of Exercise Intensity. Front Cardiovasc Med 2021; 8:734278. [PMID: 34540924 PMCID: PMC8446279 DOI: 10.3389/fcvm.2021.734278] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 07/31/2021] [Indexed: 01/04/2023] Open
Abstract
Exercise based cardiac rehabilitation (CR) is recognized internationally as a class 1 clinical practice recommendation for patients with select cardiovascular diseases and heart failure with reduced ejection fraction. Over the past decade, several meta-analyses have generated debate regarding the effectiveness of exercise-based CR for reducing all-cause and cardiovascular mortality. A common theme highlighted in these meta-analyses is the heterogeneity and/or lack of detail regarding exercise prescription methodology within CR programs. Currently there is no international consensus on exercise prescription for CR, and exercise intensity recommendations vary considerably between countries from light-moderate intensity to moderate intensity to moderate-vigorous intensity. As cardiorespiratory fitness [peak oxygen uptake (VO2peak)] is a strong predictor of mortality in patients with coronary heart disease and heart failure, exercise prescription that optimizes improvement in cardiorespiratory fitness and exercise capacity is a critical consideration for the efficacy of CR programming. This review will examine the evidence for prescribing higher-intensity aerobic exercise in CR, including the role of high-intensity interval training. This discussion will highlight the beneficial physiological adaptations to pulmonary, cardiac, vascular, and skeletal muscle systems associated with moderate-vigorous exercise training in patients with coronary heart disease and heart failure. Moreover, this review will propose how varying interval exercise protocols (such as short-duration or long-duration interval training) and exercise progression models may influence central and peripheral physiological adaptations. Importantly, a key focus of this review is to provide clinically-relevant recommendations and strategies to optimize prescription of exercise intensity while maximizing safety in patients attending CR programs.
Collapse
Affiliation(s)
- Jenna L Taylor
- Division of Preventative Cardiology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, United States
| | - Amanda R Bonikowske
- Division of Preventative Cardiology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, United States
| | - Thomas P Olson
- Division of Preventative Cardiology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, United States
| |
Collapse
|
10
|
Harwood AE, Russell S, Okwose NC, McGuire S, Jakovljevic DG, McGregor G. A systematic review of rehabilitation in chronic heart failure: evaluating the reporting of exercise interventions. ESC Heart Fail 2021; 8:3458-3471. [PMID: 34235878 PMCID: PMC8497377 DOI: 10.1002/ehf2.13498] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/17/2021] [Accepted: 06/16/2021] [Indexed: 12/13/2022] Open
Abstract
A large body of research supports the use of exercise to improve symptoms, quality of life, and physical function in patients with chronic heart failure. Previous reviews have focused on reporting outcomes of exercise interventions such as cardiorespiratory fitness. However, none have critically examined exercise prescription. The aim of this review was to evaluate the reporting and application of exercise principles in randomised control trials of exercise training in patients with chronic heart failure. A systematic review of exercise intervention RCTs in patients with CHF, using the Consensus on Exercise Reporting Template (CERT), was undertaken. The Ovid Medline/PubMed, Embase, Scopus/Web of Science, and Cochrane Library and Health Technology Assessment Databases were searched from 2000 to June 2020. Prospective RCTs in which patients with CHF were randomized to a structured exercise programme were included. No limits were placed on the type or duration of exercise structured exercise programme or type of CHF (i.e. preserved or reduced ejection fraction). We included 143 studies, comprising of 181 different exercise interventions. The mean CERT score was 10 out of 19, with no study achieving a score of 19. Primarily, details were missing regarding motivational strategies, home-based exercise components, and adherence/fidelity to the intervention. Exercise intensity was the most common principle of exercise prescription missing from intervention reporting. There was no improvement in the reporting of exercise interventions with time (R2 = 0.003). Most RCTs of exercise training in CHF are reported with insufficient detail to allow for replication, limiting the translation of evidence to clinical practice. We encourage authors to provide adequate details when reporting future interventions. Where journal word counts are restrictive, we recommend using supplementary material or publishing trial protocols prior to beginning the study.
Collapse
Affiliation(s)
- Amy E Harwood
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Science and Health Building, Whitefriars Street, Coventry University, Coventry, CV1 2DS, UK
| | - Sophie Russell
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Science and Health Building, Whitefriars Street, Coventry University, Coventry, CV1 2DS, UK
| | - Nduka C Okwose
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Science and Health Building, Whitefriars Street, Coventry University, Coventry, CV1 2DS, UK.,Cardiovascular Research Division, Translational and Clinical Research Institute, Newcastle University, UK
| | - Scott McGuire
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Science and Health Building, Whitefriars Street, Coventry University, Coventry, CV1 2DS, UK
| | - Djordje G Jakovljevic
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Science and Health Building, Whitefriars Street, Coventry University, Coventry, CV1 2DS, UK.,Cardiovascular Research Division, Translational and Clinical Research Institute, Newcastle University, UK.,Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Gordon McGregor
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Science and Health Building, Whitefriars Street, Coventry University, Coventry, CV1 2DS, UK.,Department of Cardiopulmonary Rehabilitation, Centre for Exercise and Health, University Hospitals Coventry & Warwickshire NHS Trust, Coventry, UK
| |
Collapse
|
11
|
Caminiti G, Iellamo F, Mancuso A, Cerrito A, Montano M, Manzi V, Volterrani M. Effects of 12 weeks of aerobic versus combined aerobic plus resistance exercise training on short-term blood pressure variability in patients with hypertension. J Appl Physiol (1985) 2021; 130:1085-1092. [PMID: 33630677 DOI: 10.1152/japplphysiol.00910.2020] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Short-term blood pressure (BP) variability (BPV), measured by 24-h ambulatory BP monitoring (ABPM), has been independently related to a higher risk of cardiovascular events and target organ in hypertensive patients. The aim of this study was to compare the effects of two different exercise modalities on BPV in hypertensive patients enrolled in a cardiac rehabilitation program. This study is a randomized trial, with two intervention arms: 1) aerobic training (AT) and 2) combined aerobic and resistance training (CT). We studied 55 male patients with hypertension. They were randomly assigned either to AT or CT group. The training program lasted 12 wk for each group. Short-term BP variability was evaluated by means of average real variability (ARV), at baseline and after 12 wk, by ABPM. Systolic and diastolic 24-h BP values decreased significantly (P < 0.01) in both groups, without between-groups differences (P = 0.11). The 24-h systolic BP variability decreased in both groups (AT: from 8.4 ± 1.2 to 7.6 ± 0.8; CT: from 8.8 ± 1.5 to 7.1 ± 1.1), with a greater decrease in CT (P = 0.02). Night-time systolic BPV decreased in CT (from 9.4 ± 1.3 to 8.3 ± 1.2, P = 0.03) and remained unchanged in AT (from 9.5 ± 1.2 to 9.4 ± 1.4). Day-time BPV decreased in both groups without between-groups differences (P = 0.07). CT was more effective than AT in reducing short-term BPV in hypertensive patients, and both exercise modalities reduced BP to a same extent. CT appears to be a more appropriate exercise modality if the objective is to reduce BPV in addition to BP levels.NEW & NOTEWORTHY Combined exercise training (CT) including aerobic plus resistance exercises could be more effective in comparison with aerobic exercise (AT) alone in reducing blood pressure variability (BPV) in hypertensive patients. We report that CT was indeed more effective than AT in reducing short-term BPV, and both exercise modalities reduced BP levels to the same extent. CT appears to be a more appropriate exercise modality if the objective is to reduce BPV in addition to BP levels.
Collapse
Affiliation(s)
| | - Ferdinando Iellamo
- Department of Cardiology, IRCCS San Raffaele, Rome, Italy.,Dipartimento di Scienze Cliniche e Medicina Traslazionale, Università Tor Vergata, Rome, Italy
| | | | - Anna Cerrito
- Department of Cardiology, IRCCS San Raffaele, Rome, Italy
| | - Matteo Montano
- Dipartimento di Scienze Cliniche e Medicina Traslazionale, Università Tor Vergata, Rome, Italy
| | - Vincenzo Manzi
- Department of Cardiology, IRCCS San Raffaele, Rome, Italy
| | | |
Collapse
|
12
|
Suarez-Roca H, Mamoun N, Sigurdson MI, Maixner W. Baroreceptor Modulation of the Cardiovascular System, Pain, Consciousness, and Cognition. Compr Physiol 2021; 11:1373-1423. [PMID: 33577130 DOI: 10.1002/cphy.c190038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Baroreceptors are mechanosensitive elements of the peripheral nervous system that maintain cardiovascular homeostasis by coordinating the responses to external and internal environmental stressors. While it is well known that carotid and cardiopulmonary baroreceptors modulate sympathetic vasomotor and parasympathetic cardiac neural autonomic drive, to avoid excessive fluctuations in vascular tone and maintain intravascular volume, there is increasing recognition that baroreceptors also modulate a wide range of non-cardiovascular physiological responses via projections from the nucleus of the solitary tract to regions of the central nervous system, including the spinal cord. These projections regulate pain perception, sleep, consciousness, and cognition. In this article, we summarize the physiology of baroreceptor pathways and responses to baroreceptor activation with an emphasis on the mechanisms influencing cardiovascular function, pain perception, consciousness, and cognition. Understanding baroreceptor-mediated effects on cardiac and extra-cardiac autonomic activities will further our understanding of the pathophysiology of multiple common clinical conditions, such as chronic pain, disorders of consciousness (e.g., abnormalities in sleep-wake), and cognitive impairment, which may result in the identification and implementation of novel treatment modalities. © 2021 American Physiological Society. Compr Physiol 11:1373-1423, 2021.
Collapse
Affiliation(s)
- Heberto Suarez-Roca
- Department of Anesthesiology, Center for Translational Pain Medicine, Duke University, Durham, North Carolina, USA
| | - Negmeldeen Mamoun
- Department of Anesthesiology, Division of Cardiothoracic Anesthesia and Critical Care Medicine, Duke University, Durham, North Carolina, USA
| | - Martin I Sigurdson
- Department of Anesthesiology and Critical Care Medicine, Landspitali, University Hospital, Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - William Maixner
- Department of Anesthesiology, Center for Translational Pain Medicine, Duke University, Durham, North Carolina, USA
| |
Collapse
|
13
|
Rodríguez-Núñez I, Pontes RB, Romero F, Campos RR. Effects of physical exercise on baroreflex sensitivity and renal sympathetic nerve activity in chronic nicotine-treated rats. Can J Physiol Pharmacol 2020; 99:786-794. [PMID: 33290163 DOI: 10.1139/cjpp-2020-0381] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Chronic nicotine exposure may increase cardiovascular risk by impairing the cardiac autonomic function. Besides, physical exercise (PE) has shown to improve cardiovascular health. Thus, we aimed to investigate the effects of PE on baroreflex sensitivity (BRS), heart rate variability (HRV), and sympathetic nerve activity (SNA) in chronically nicotine-exposed rats. Male Wistar rats were assigned to four independent groups: Control (treated with saline solution), Control+Ex (treated with saline and submitted to treadmill training), Nicotine (treated with Nicotine), and Nicotine+Ex (treated with nicotine and submitted to treadmill training). Nicotine (1 mg·kg-1) was administered daily for 28 consecutive days. PE consisted of running exercise (60%-70% of maximal aerobic capacity) for 45 min, 5 days per week, for 4 weeks. At the end of the protocol, cardiac BRS, HRV, renal SNA (rSNA), and renal BRS were assessed. Nicotine treatment decreased absolute values of HRV indexes, increased low frequency/high frequency ratio of HRV, reduced the bradycardic and sympatho-inhibitory baroreceptor reflex responses, and reduced the rSNA. PE effectively restored time-domain HRV indexes, the bradycardic and sympatho-inhibitory reflex responses, and the rSNA in chronic nicotine-treated rats. PE was effective in preventing the deterioration of time-domain parameters of HRV, arterial baroreceptor dysfunction, and the rSNA after nicotine treatment.
Collapse
Affiliation(s)
- Iván Rodríguez-Núñez
- Departamento de Fisiologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, Brazil.,Departamento de Kinesiología, Facultad de Medicina, Universidad de Concepción, Chile
| | - Roberto B Pontes
- Departamento de Fisiologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, Brazil
| | - Fernando Romero
- Programa de Doctorado en Ciencias Médicas, Departamento de Cirugía, Facultad de Medicina, Universidad de La Frontera, Temuco. Chile
| | - Ruy R Campos
- Departamento de Fisiologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, Brazil
| |
Collapse
|
14
|
Iellamo F, Lucini D, Volterrani M, Casasco M, Salvati A, Gianfelici A, Di Gianfrancesco A, Urso A, Manzi V. Autonomic nervous system responses to strength training in top-level weight lifters. Physiol Rep 2020; 7:e14233. [PMID: 31642195 PMCID: PMC6805848 DOI: 10.14814/phy2.14233] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 07/10/2019] [Accepted: 07/24/2019] [Indexed: 11/24/2022] Open
Abstract
In athletes, spectral analysis of HR variability (HRV) has been shown capable to detect the adaptational changes in sympatho‐vagal control attending physical training. So far, studies investigated autonomic nervous system (ANS) changes occurring with endurance training, whereas adaptations to markedly different exercise modes, for example, strength training, have never been investigated. We assessed the changes in cardiac ANS parameters during long‐term training in weight lifters of the Italian team preparing for the European Championship, where athletes competed for obtaining the pass for Olympic Games. We investigated nine athletes. Subject trained 3 sessions/day, 6 days a week. The intensity of strength exercises varied from 70% to 95% 1 RM. Training load (TL) was calculated as: volume (min) × intensity (%1RM).All ANS parameters were significantly and highly correlated on an individual basis to the dose of exercise with a second‐order regression model (r2 ranged from 0.96 to 0.99; P < 0.001). The low‐frequency (LF) component of HRV and LF/HF ratio showed an initial increase with the progression of TL and then a decrease, resembling a bell‐shaped curve with a minimum at the highest TL. The high‐frequency (HF) component of HRV and R‐R interval showed a reciprocal pattern, with an initial decrease with progression of TL followed by an increase, resembling an U‐shaped curve with a maximum at the highest TL. These adaptations were at the opposite to those previously reported in endurance athletes. These results suggest that in Olympic weight lifters, ANS adaptations to training are dose‐related on individual basis and that ANS adaptations are mainly sport‐specific.
Collapse
Affiliation(s)
- Ferdinando Iellamo
- Department of Clinical Science and Translational Medicine and School of Sports Medicine, University Tor Vergata, Rome, Italy.,Scientific Institute of Research and Scientific Institute of Research and Care Care, San Raffaele Pisana, Rome, Italy
| | - Daniela Lucini
- BIOMETRA, Exercise Medicine Unit, University of Milan, Humanitas, Milan, Italy
| | - Maurizio Volterrani
- Scientific Institute of Research and Scientific Institute of Research and Care Care, San Raffaele Pisana, Rome, Italy
| | | | | | - Antonio Gianfelici
- Italian Federation of Sport Medicine, Rome, Italy.,Italian Federation of weight lifting, Rome, Italy
| | | | - Antonio Urso
- Italian Federation of weight lifting, Rome, Italy
| | - Vincenzo Manzi
- Scientific Institute of Research and Scientific Institute of Research and Care Care, San Raffaele Pisana, Rome, Italy
| |
Collapse
|
15
|
Short-term effects of a 3-week interval training program on heart rate variability in chronic heart failure. A randomised controlled trial. Ann Phys Rehabil Med 2019; 62:321-328. [DOI: 10.1016/j.rehab.2019.06.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 06/25/2019] [Accepted: 06/30/2019] [Indexed: 01/08/2023]
|
16
|
Influence of High-Intensity Interval Training Versus Continuous Training on Functional Capacity in Individuals With Heart Failure. J Cardiopulm Rehabil Prev 2019; 39:293-298. [DOI: 10.1097/hcr.0000000000000424] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
17
|
Pattyn N, Beulque R, Cornelissen V. Aerobic Interval vs. Continuous Training in Patients with Coronary Artery Disease or Heart Failure: An Updated Systematic Review and Meta-Analysis with a Focus on Secondary Outcomes. Sports Med 2018; 48:1189-1205. [PMID: 29502328 DOI: 10.1007/s40279-018-0885-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND In a previous meta-analysis including nine trials comparing aerobic interval training with aerobic continuous training in patients with coronary artery disease, we found a significant difference in peak oxygen uptake favoring aerobic interval training. OBJECTIVE The objective of this study was to (1) update the original meta-analysis focussing on peak oxygen uptake and (2) evaluate the effect on secondary outcomes. METHODS We conducted a systematic review with a meta-analysis by searching PubMed and SPORTDiscus databases up to March 2017. We included randomized trials comparing aerobic interval training and aerobic continuous training in patients with coronary artery disease or chronic heart failure. The primary outcome was change in peak oxygen uptake. Secondary outcomes included cardiorespiratory parameters, cardiovascular risk factors, cardiac and vascular function, and quality of life. RESULTS Twenty-four papers were identified (n = 1080; mean age 60.7 ± 10.7 years). Aerobic interval training resulted in a higher increase in peak oxygen uptake compared with aerobic continuous training in all patients (1.40 mL/kg/min; p < 0.001), and in the subgroups of patients with coronary artery disease (1.25 mL/kg/min; p = 0.001) and patients with chronic heart failure with reduced ejection fraction (1.46 mL/kg/min; p = 0.03). Moreover, a larger increase of the first ventilatory threshold and peak heart rate was observed after aerobic interval training in all patients. Other cardiorespiratory parameters, cardiovascular risk factors, and quality of life were equally affected. CONCLUSION This meta-analysis adds further evidence to the clinically significant larger increase in peak oxygen uptake following aerobic interval training vs. aerobic continuous training in patients with coronary artery disease and chronic heart failure. More well-designed randomized controlled trials are needed to establish the safety of aerobic interval training and the sustainability of the training response over longer periods.
Collapse
Affiliation(s)
- Nele Pattyn
- Department of Rehabilitation Sciences, KU Leuven, Leuven, Belgium. .,Department of Cardiology, KU Leuven, Leuven, Belgium.
| | - Randy Beulque
- Department of Rehabilitation Sciences, KU Leuven, Leuven, Belgium
| | | |
Collapse
|
18
|
Di Daniele N, Tesauro M, Mascali A, Rovella V, Scuteri A. Lower Heart Rate Variability Is Associated with Lower Pulse Pressure Amplification: Role of Obesity. Pulse (Basel) 2018; 5:99-105. [PMID: 29761083 DOI: 10.1159/000479701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 07/18/2017] [Indexed: 12/29/2022] Open
Abstract
Background Heart rate variability (HRV), pulse pressure amplification, and obesity represent risk factors for cardiovascular events. The aims of the present study are (1) to explore the impact of HRV on pulse pressure amplification and (2) to investigate whether the association between HRV and pulse pressure amplification differs in obese and lean subjects. Methods A total of 342 patients (age 61 ± 11 years) were enrolled. HRV was analyzed concerning both the frequency and time domain as well as concerning the HRV triangular index. Pulse pressure amplification was estimated as the ratio between brachial and carotid pulse pressure, the latter measured with SphygmoCor. Results Time domain HRV indices were directly correlated with pulse pressure amplification (the lower the HRV indices, the lower the pulse pressure amplification). This association was stronger in obese than in lean subjects after controlling for age and sex. Conclusion Larger controlled studies are needed to provide a more detailed insight into the relation between HRV and pulse pressure amplification and to determine which pathways are differentially activated in lean and obese subjects.
Collapse
Affiliation(s)
- Nicola Di Daniele
- Hypertension Unit, Department of Internal Medicine, Policinico Tor Vergata, Università di Roma Tor Vergata, Rome, Italy
| | - Manfredi Tesauro
- Hypertension Unit, Department of Internal Medicine, Policinico Tor Vergata, Università di Roma Tor Vergata, Rome, Italy
| | - Alberto Mascali
- Hypertension Unit, Department of Internal Medicine, Policinico Tor Vergata, Università di Roma Tor Vergata, Rome, Italy
| | - Valentina Rovella
- Hypertension Unit, Department of Internal Medicine, Policinico Tor Vergata, Università di Roma Tor Vergata, Rome, Italy
| | - Angelo Scuteri
- Hypertension Unit, Department of Internal Medicine, Policinico Tor Vergata, Università di Roma Tor Vergata, Rome, Italy
| |
Collapse
|
19
|
Iellamo F, Volterrani M. Letter by Iellamo and Volterrani Regarding Article, "High-Intensity Interval Training in Patients With Heart Failure With Reduced Ejection Fraction". Circulation 2017; 136:605-606. [PMID: 28784830 DOI: 10.1161/circulationaha.117.028249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ferdinando Iellamo
- From Department of Clinical Sciences and Translational Medicine, University of Tor Vergata, Rome, Italy (F.I.); and Cardiology Department, Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Rome, Italy (F.I., M.V.)
| | - Maurizio Volterrani
- From Department of Clinical Sciences and Translational Medicine, University of Tor Vergata, Rome, Italy (F.I.); and Cardiology Department, Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Rome, Italy (F.I., M.V.)
| |
Collapse
|
20
|
Antunes-Correa LM, Ueno-Pardi LM, Trevizan PF, Santos MR, da Silva CHP, Franco FGM, Alves MJNN, Rondon MUPB, Negrao CE. The influence of aetiology on the benefits of exercise training in patients with heart failure. Eur J Prev Cardiol 2016; 24:365-372. [DOI: 10.1177/2047487316683530] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
| | - Linda M Ueno-Pardi
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Patricia F Trevizan
- Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil
| | - Marcelo R Santos
- Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil
| | | | - Fábio GM Franco
- Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil
| | | | | | - Carlos E Negrao
- Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| |
Collapse
|
21
|
Besnier F, Labrunée M, Pathak A, Pavy-Le Traon A, Galès C, Sénard JM, Guiraud T. Exercise training-induced modification in autonomic nervous system: An update for cardiac patients. Ann Phys Rehabil Med 2016; 60:27-35. [PMID: 27542313 DOI: 10.1016/j.rehab.2016.07.002] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 07/01/2016] [Accepted: 07/07/2016] [Indexed: 12/14/2022]
Abstract
Patients with cardiovascular disease show autonomic dysfunction, including sympathetic activation and vagal withdrawal, which leads to fatal events. This review aims to place sympathovagal balance as an essential element to be considered in management for cardiovascular disease patients who benefit from a cardiac rehabilitation program. Many studies showed that exercise training, as non-pharmacologic treatment, plays an important role in enhancing sympathovagal balance and could normalize levels of markers of sympathetic flow measured by microneurography, heart rate variability or plasma catecholamine levels. This alteration positively affects prognosis with cardiovascular disease. In general, cardiac rehabilitation programs include moderate-intensity and continuous aerobic exercise. Other forms of activities such as high-intensity interval training, breathing exercises, relaxation and transcutaneous electrical stimulation can improve sympathovagal balance and should be implemented in cardiac rehabilitation programs. Currently, the exercise training programs in cardiac rehabilitation are individualized to optimize health outcomes. The sports science concept of the heart rate variability (HRV)-vagal index used to manage exercise sessions (for a goal of performance) could be implemented in cardiac rehabilitation to improve cardiovascular fitness and autonomic nervous system function.
Collapse
Affiliation(s)
- Florent Besnier
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France; Clinic of Saint-Orens, Cardiovascular and Pulmonary Rehabilitation Center, Saint-Orens-de-Gameville, France
| | - Marc Labrunée
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France; Department of Rehabilitation, Toulouse University Hospital, Toulouse, France
| | - Atul Pathak
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France; Unit of Hypertension, Risk Factors and Heart Failure, Clinique Pasteur, Toulouse, France
| | - Anne Pavy-Le Traon
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France
| | - Céline Galès
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France
| | - Jean-Michel Sénard
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France
| | - Thibaut Guiraud
- Institute of Cardiovascular and Metabolic Diseases, National Institute of Health and Medical Research (INSERM), UMR-1048, Toulouse, France; Clinic of Saint-Orens, Cardiovascular and Pulmonary Rehabilitation Center, Saint-Orens-de-Gameville, France.
| |
Collapse
|
22
|
Masson GS, Borges JP, da Silva PPS, da Nóbrega ACL, Tibiriçá E, Lessa MA. Effect of continuous and interval aerobic exercise training on baroreflex sensitivity in heart failure. Auton Neurosci 2016; 197:9-13. [DOI: 10.1016/j.autneu.2016.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 02/04/2016] [Accepted: 03/08/2016] [Indexed: 10/22/2022]
|
23
|
Volterrani M, Iellamo F. Cardiac Rehabilitation in Patients With Heart Failure: New Perspectives in Exercise Training. Card Fail Rev 2016; 2:63-68. [PMID: 28785455 DOI: 10.15420/cfr.2015:26:1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Exercise training is recommended to patients with chronic heart failure (CHF) and reduced ejection fraction at a class 1 evidence level. Currently the 'dose' of exercise (dose being both volume and intensity) still remains uncertain and the best form of aerobic exercise training has not been defined. Guidelines commonly use heart rate (HR) as a target factor for both moderate continuous and interval training exercises. However, exercise training guided by HR can be limited in CHF patients due to chronotropic incompetence and beta-blocker treatment. In our study, we systematically addressed the above issues by applying a training method that takes into account both the volume and intensity of exercise on an individual basis. This method is referred to as individual TRaining IMPulses (TRIMPi). In this review, we summarise a series of investigations that used TRIMPi and different exercise forms to quantify the optimum training load in CHF patients. This review also highlights the way TRIMPi and the individual exercise dose affects cardiorespiratory, metabolic and autonomic cardiac adaptations.
Collapse
Affiliation(s)
| | - Ferdinando Iellamo
- Research Institute San Raffaele Pisana, Rome, Italy.,University of Rome Tor Vergata, Rome, Italy
| |
Collapse
|
24
|
Piotrowicz E, Buchner T, Piotrowski W, Piotrowicz R. Influence of home-based telemonitored Nordic walking training on autonomic nervous system balance in heart failure patients. Arch Med Sci 2015; 11:1205-12. [PMID: 26788081 PMCID: PMC4697054 DOI: 10.5114/aoms.2015.56346] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Accepted: 09/16/2014] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION Rehabilitation positively affects the modulation of the autonomic nervous system (ANS). There are no papers evaluating the influence of Nordic walking training (NW) on ANS activity among chronic heart failure (CHF) patients. The aim of study was to assess the influence of NW on ANS activity measured by heart rate variability (HRV) and heart rate turbulence (HRT) in CHF patients and its correlation with physical capacity improvement measured by peak oxygen consumption (peak VO2 [ml/kg/min]) in the cardiopulmonary exercise treadmill test (CPET). MATERIAL AND METHODS The study group comprised 111 CHF patients (NYHA class II-III; ejection fraction (EF) ≤ 40%). Patients were randomized (2 : 1) to 8-week NW (five times weekly) at 40-70% of maximal heart rate (training group - TG) (n = 77), or to a control group (CG) (n = 34). The effectiveness of NW was assessed by changes (delta (Δ)) in peak VO2, HRV and HRT as a result of comparing these parameters from the beginning and the end of the programme. RESULTS Eventually, 36 TG patients and 15 CG patients were eligible for HRV and HRT analysis. In the TG low/high frequency ratio (LF/HF) decreased (1.9 ±1.11 vs. 1.7 ±0.63, p = 0.0001) and peak VO2 increased (16.98 ±4.02 vs. 19.70 ±4.36 ml/kg/min, p < 0.0001). Favourable results in CG were not observed. The differences between TG and CG were significant: Δpeak VO2 (p = 0.0081); ΔLF/HF (p = 0.0038). An inverse correlation was found between the decrease in ΔLF/HF and the increase in Δpeak VO2 (R = -0.3830, p = 0.0211) only in the TG. Heart rate variability did not change significantly in either group. CONCLUSIONS Nordic walking positively affects the parasympathetic-sympathetic balance in CHF patients, which correlates with the improvement in Δpeak VO2. No significant influence of NW on HRT was observed.
Collapse
Affiliation(s)
- Ewa Piotrowicz
- Telecardiology Centre, Institute of Cardiology, Warsaw, Poland
| | - Teodor Buchner
- Faculty of Physics, Warsaw University of Technology, Warsaw, Poland
| | | | - Ryszard Piotrowicz
- Department of Cardiac Rehabilitation and Non-invasive Electrocardiology, Institute of Cardiology, Warsaw, Poland
| |
Collapse
|
25
|
Piotrowicz E, Piotrowski W, Piotrowicz R. Positive Effects of the Reversion of Depression on the Sympathovagal Balance after Telerehabilitation in Heart Failure Patients. Ann Noninvasive Electrocardiol 2015; 21:358-68. [PMID: 26524699 DOI: 10.1111/anec.12320] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 07/25/2015] [Accepted: 08/06/2015] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Autonomic nervous system (ANS) dysfunction appears in the course of both chronic heart failure (CHF) and depression. Comprehensive cardiac rehabilitation (CCR), apart from improving physical capacity, can reduce depressive symptoms and leads to the restoration of ANS function among CHF patients. The purpose was to evaluate the influence of the reversion of depression (measured by Beck Depression Inventory [BDI] score, cut point <10) and the physical capacity improvement (measured by peak oxygen consumption [peak VO2 ; ml/kg per minute]) on the sympathovagal balance (measured by low/high frequency ratio [LF/HF]) after CCR in CHF patients. METHODS The study group comprised 111 CHF patients (New York Heart Association II-III; left ventricular ejection fraction ≤ 40%). Patients were randomized (2:1) to 8-week CCR based on Nordic walking training (five times weekly) at 40-70% of maximal heart rate, training group (TG) n = 77, or to control group (CG) n = 34. The effectiveness of CCR was assessed by changes-delta (Δ) in LF/HF, BDI score, and peak VO2 , as a result of comparing these parameters from the beginning and the end of the program. RESULTS Eventually, 46 patients in TG and 23 patients in CG were eligible for simultaneous ANS and psychological status analysis. Only in TG the LF/HF decreased 2.06 ± 1.14 versus 1.19 ± 0.80 (P < 0.0001) and peak VO2 increased 16.83 ± 3.72 versus 19.14 ± 4.20 ml/kg per minute (P < 0.0001). Favorable results in CG were not observed. The differences between TG and CG were significant: Δpeak VO2 (P < 0.0001); ΔLF/HF (P = 0.0001). Depressive symptoms were substantially reduced in both groups (TG, P = 0.0006; CG, P = 0.0490). Nevertheless, the greatest improvement of sympathovagal balance was observed in patients whose depression was reversed, thanks to the CCR in comparison to other patients from TG and the entire CG. CONCLUSION Positive effect of the sympatho-parasympathetic balance obtained during the home CCR based on Nordic walking training results from the additive effects of the reversion of depression and physical capacity improvement in CHF patients.
Collapse
Affiliation(s)
- Ewa Piotrowicz
- Institute of Cardiology, Telecardiology Center, Warsaw, Poland
| | | | - Ryszard Piotrowicz
- Department of Cardiac Rehabilitation and Noninvasive Electrocardiology, Institute of Cardiology, Warsaw, Poland
| |
Collapse
|
26
|
Effects of Exercise Training on Autonomic Function in Chronic Heart Failure: Systematic Review. BIOMED RESEARCH INTERNATIONAL 2015; 2015:591708. [PMID: 26543861 PMCID: PMC4620239 DOI: 10.1155/2015/591708] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 09/10/2015] [Accepted: 09/13/2015] [Indexed: 11/25/2022]
Abstract
Objectives. Cardiac autonomic imbalance accompanies the progression of chronic heart failure (CHF). It is unclear whether exercise training could modulate autonomic control in CHF. This study aimed to review systematically the effects of exercise training on heart rate recovery (HRR) and heart rate variability (HRV) in patients with CHF. Methods. Literatures were systematically searched in electronic databases and relevant references. Only published randomized controlled trials (RCTs) focusing on exercise training for CHF were eligible for inclusion. Outcome measurements included HRR and HRV parameters. Results. Eight RCTs were eligible for inclusion and provided data on 280 participants (186 men). The participants were 52–70 years of age with New York Heart Association functional class II-III of CHF. Each study examined either aerobic or resistance exercise. Two trials addressed outcome of HRR and six HRV among these studies. Two RCTs showed that moderate aerobic exercise could improve HRR at 2 minutes after exercise training in CHF. Five of six RCTs demonstrated positive effects of exercise training on HRV which revealed the increments in high frequency (HF) and decrements in LF (low frequency)/HF ratio after training. Conclusion. Participation in an exercise training program has positive effects on cardiac autonomic balance in patients with CHF.
Collapse
|
27
|
Giese-Davis J, Wilhelm FH, Tamagawa R, Palesh O, Neri E, Taylor CB, Kraemer HC, Spiegel D. Higher vagal activity as related to survival in patients with advanced breast cancer: an analysis of autonomic dysregulation. Psychosom Med 2015; 77:346-55. [PMID: 25886831 PMCID: PMC5509754 DOI: 10.1097/psy.0000000000000167] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE High levels of high-frequency heart rate variability (HF-HRV), related to parasympathetic-nervous-system functioning, have been associated with longer survival in patients with myocardial infarction and acute trauma and in patients undergoing palliative care. From animal studies linking higher vagal activity with better immune system functioning and reduced metastases, we hypothesized that higher HF-HRV would predict longer survival in patients with metastatic or recurrent breast cancer (MRBC). METHODS Eighty-seven patients with MRBC participated in a laboratory task including a 5-minute resting baseline electrocardiogram. HF-HRV was computed as the natural logarithm of the summed power spectral density of R-R intervals (0.15-0.50 Hz). In this secondary analysis of a study testing whether diurnal cortisol slope predicted survival, we tested the association between resting baseline HF-HRV on survival using Cox proportional hazards models. RESULTS A total of 50 patients died during a median follow-up of 7.99 years. Higher baseline HF-HRV predicted significantly longer survival, with a hazard ratio of 0.75 (95% confidence interval = 0.60-0.92, p = .006). Visceral metastasis status and baseline heart rate were related to both HF-HRV and survival. However, a combination of HF-HRV and heart rate further improved survival prediction, with a hazard ratio of 0.64 (95% confidence interval = 0.48-0.85, p = .002). CONCLUSIONS Vagal activity of patients with MRBC strongly predicted their survival, extending the known predictive window of HF-HRV in cancer beyond palliative care. Vagal activity can be altered by behavioral, pharmacological, and surgical interventions and may be a promising target for extending life expectancy in patients with metastasizing cancer.
Collapse
Affiliation(s)
- Janine Giese-Davis
- Department of Oncology, Division of Psychosocial Oncology, University of Calgary
- Tom Baker Cancer Centre, Psychosocial Resources, Calgary, Alberta
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| | - Frank H. Wilhelm
- Department of Psychology, Division of Clinical Psychology, Psychotherapy, & Health Psychology, University of Salzburg
| | - Rie Tamagawa
- Department of Oncology, Division of Psychosocial Oncology, University of Calgary
- Tom Baker Cancer Centre, Psychosocial Resources, Calgary, Alberta
| | - Oxana Palesh
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| | - Eric Neri
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| | - C. Barr Taylor
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| | - Helena C. Kraemer
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| | - David Spiegel
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| |
Collapse
|
28
|
Treadmill gait training improves baroreflex sensitivity in Parkinson's disease. Clin Auton Res 2015; 24:111-8. [PMID: 24659140 DOI: 10.1007/s10286-014-0236-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Accepted: 02/27/2014] [Indexed: 10/25/2022]
Abstract
BACKGROUND Partial weight supported treadmill gait training (PWSTT) is widely used in rehabilitation of gait in patient with Parkinson’s Diseases (PD). However, its effect on blood pressure variability (BPV) and baroreflex sensitivity (BRS) in PD has not been studied. AIM To evaluate the effect of conventional and treadmill gait training on BPV components and BRS. METHODS Sixty patients with idiopathic PD were randomized into three groups. Twenty patients in control group were on only stable medication, 20 patients in conventional gait training (CGT) group (Stable medication with CGT) and 20 patients in PWSTT group (Stable medication with 20 % PWSTT). The CGT and PWSTT sessions were given for 30 min per day, 4 days per week, for 4 weeks (16 sessions). Groups were evaluated in their best ‘ON’ states. The beat-to-beat finger blood pressure (BP) was recorded for 10 min using a Finometer instrument (Finapres Medical Systems, The Netherlands). BPV and BRS results were derived from artifact-free 5-min segments using Nevrocard software. RESULTS BRS showed a significant group with time interaction (F = 6.930; p = 0.003). Post-hoc analysis revealed that PWSTT group showed significant improvement in BRS (p < 0.001) after 4 weeks of training. No significant differences found in BPV parameters; systolic BP, diastolic BP, co-variance of systolic BP and low frequency component of systolic BP. CONCLUSIONS Four weeks of PWSTT significantly improves BRS in patients with PD. It can be considered as a non-invasive method of influencing BRS for prevention of orthostatic BP fall in patients with PD.
Collapse
|
29
|
Pattyn N, Coeckelberghs E, Buys R, Cornelissen VA, Vanhees L. Aerobic interval training vs. moderate continuous training in coronary artery disease patients: a systematic review and meta-analysis. Sports Med 2014; 44:687-700. [PMID: 24549476 DOI: 10.1007/s40279-014-0158-x] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Exercise training improves exercise capacity (peakVO2), which is closely related to long-term survival in cardiac patients. However, it remains unclear which type and intensity of exercise is most effective for improving exercise tolerance and body weight. Individual studies suggest that aerobic interval training (AIT) might increase peakVO2 more in this population. OBJECTIVE We conducted a meta-analysis to summarize the effects of AIT compared with moderate continuous training (MCT) on peakVO2, submaximal exercise capacity, and body weight in patients with coronary artery disease (CAD) with preserved and/or reduced left ventricular ejection fraction (LVEF). DATA SOURCES AND STUDY SELECTION A systematic search was conducted and we included randomized trials comparing AIT and MCT in CAD patients lasting at least 4 weeks, reporting peakVO2 results, and published in a peer-reviewed journal up to May 2013. The primary outcome measure was peakVO2. Secondary outcomes were submaximal exercise capacity parameters and body weight. SYNTHESIS METHODS Random- and fixed-effects models were used and data were reported as weighted means and 95% confidence intervals (CIs). RESULTS Nine study groups were included, involving 206 patients (100 AIT, 106 MCT). Overall, AIT resulted in a significantly larger increase in peakVO2 [+1.60 mL/kg/min (95% CI 0.18-3.02; p = 0.03)] compared with MCT. MCT seemed to be more effective in reducing body weight (-0.78 kg; 95% CI -0.01 to 1.58; p = 0.05). LIMITATIONS The small number of studies might have affected the power to reach significance for the secondary outcomes. CONCLUSION In CAD patients with preserved and/or reduced LVEF, AIT is superior to MCT for improving peakVO2, while MCT seems to be more effective in reducing body weight. However, large, well-designed, randomized controlled trials are warranted to confirm these findings.
Collapse
Affiliation(s)
- Nele Pattyn
- Department of Rehabilitation Sciences, KU Leuven, Leuven, Tervuursevest 101, B 1501, 3001, Heverlee, Belgium,
| | | | | | | | | |
Collapse
|
30
|
Iellamo F, Manzi V, Caminiti G, Vitale C, Massaro M, Cerrito A, Rosano G, Volterrani M. Validation of rate of perceived exertion-based exercise training in patients with heart failure: insights from autonomic nervous system adaptations. Int J Cardiol 2014; 176:394-8. [PMID: 25129282 DOI: 10.1016/j.ijcard.2014.07.076] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Revised: 05/29/2014] [Accepted: 07/24/2014] [Indexed: 11/19/2022]
Abstract
BACKGROUND Exercise prescription in cardiac patients is based on heart rate (HR) response to exercise. How to prescribe long-term exercise training outside medically-supervised settings also considering changes in individual physical capacity over time is unknown. In this study we hypothesized that in patients with chronic heart failure (CHF) the session-rate of perceived exertion (RPE), a subjective-based training methodology, provides autonomic and functional capacity changes superimposable to those observed with HR-based Training Impulses (TRIMPi) method. METHODS Twenty patients with stable CHF were randomized to either aerobic continuous training (ACT) or aerobic interval training (AIT) for 12 weeks. For each TRIMPi-guided exercise session, the session-RPE was recorded. By this method, internal training load (TL) is quantified by multiplying the RPE of the whole training session, using the Borg CR10-scale, by its duration. Heart rate variability (HRV), and baroreflex sensitivity (BRS) were assessed at baseline and at 3 weeks intervals. RESULTS Significant correlations were found between TRIMPi and individual session-RPE, for both ACT and AIT (r=0.63 to 0.81), (P<0.05). The same occurred when ACT and AIT groups were pooled together (r=0.72; P<0.01). R-R interval, HRV and BRS were significantly and very highly correlated with weekly RPE-session (r(2) ranged from 0.77 to 0.97; P<0.001). A significant relationship between session-RPE and performance at the 6MWT was also found. CONCLUSIONS Session-RPE is an easy-to-use, inexpensive and valid method for exercise prescription and health maintenance, consistent with objective physiological indices of training, that could be used for long-term physical activity in patients with CHF.
Collapse
Affiliation(s)
- Ferdinando Iellamo
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy; Dipartimento di Medicina dei Sistemi, Università Tor Vergata, Roma, Italy.
| | - Vincenzo Manzi
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy
| | - Giuseppe Caminiti
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy
| | - Cristiana Vitale
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy
| | - Michele Massaro
- Dipartimento di Medicina dei Sistemi, Università Tor Vergata, Roma, Italy
| | - Anna Cerrito
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy
| | - Giuseppe Rosano
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy
| | - Maurizio Volterrani
- Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Pisana, Roma, Italy
| |
Collapse
|
31
|
La Rovere MT, Pinna GD. Beneficial effects of physical activity on baroreflex control in the elderly. Ann Noninvasive Electrocardiol 2014; 19:303-10. [PMID: 24844457 DOI: 10.1111/anec.12170] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
The baroreflex mechanisms, by controlling autonomic outflow to the heart and circulation, contribute importantly to neural circulatory control. The main function of the baroreflex is to prevent wide fluctuations in arterial blood pressure and to maintain the physiological homeostasis under basal resting conditions and in response to acute stress. Baroreflex-mediated changes in autonomic outflow affect heart rate, myocardial contractility, and peripheral vascular resistance. The baroreflex control of heart rate is of particular interest in pathological conditions, since it has been associated with increased propensity for cardiac mortality and sudden death. Aging is associated with significant cardiovascular modifications. The changes in baroreflex function that occur with age have been systematically studied by several methodological approaches. The available evidence indicates a reduced arterial baroreflex control of heart rate favoring an increase in sympathetic and a decrease in parasympathetic drive to the heart as well as an impairment in the baroreceptor control of blood pressure. Both kinds of changes have resultant clinical implications. Exercise training can modulate the age-related decline in baroreflex function and the attending abnormalities in autonomic control, thus accounting for some of the beneficial effects of physical activity in reducing the risk of cardiovascular morbidity and mortality.
Collapse
Affiliation(s)
- Maria Teresa La Rovere
- Department of Cardiology and Biomedical Engineering, Fondazione "Salvatore Maugeri," IRCCS, Istituto Scientifico di Montescano (Pavia), Italy
| | | |
Collapse
|
32
|
Prinsloo GE, Rauch HGL, Derman WE. A brief review and clinical application of heart rate variability biofeedback in sports, exercise, and rehabilitation medicine. PHYSICIAN SPORTSMED 2014; 42:88-99. [PMID: 24875976 DOI: 10.3810/psm.2014.05.2061] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
CONTEXT An important component of the effective management of chronic noncommunicable disease is the assessment and management of psychosocial stress. The measurement and modulation of heart rate variability (HRV) may be valuable in this regard. OBJECTIVE To describe the measurement and physiological control of HRV; to describe the impact of psychosocial stress on cardiovascular disease, metabolic syndrome, and chronic respiratory disease, and the relationship between these diseases and changes in HRV; and to describe the influence of biofeedback and exercise on HRV and the use of HRV biofeedback in the management of chronic disease. DATA SOURCES AND STUDY SELECTION The PubMed, Medline, and Embase databases were searched (up to August 2013). Additional articles were obtained from the reference lists of relevant articles and reviews. Articles were individually selected for further review based on the quality and focus of the study, and the population studied. RESULTS Heart rate variability is reduced in stress and in many chronic diseases, and may even predict the development and prognosis of some diseases. Heart rate variability can be increased with both exercise and biofeedback. Although the research on the effect of exercise is conflicting, there is evidence that aerobic training may increase HRV and cardiac vagal tone both in healthy individuals and in patients with disease. Heart rate variability biofeedback is also an effective method of increasing HRV and cardiac vagal tone, and has been shown to decrease stress and reduce the morbidity and mortality of disease. CONCLUSION The assessment and management of psychosocial stress is a challenging but important component of effective comprehensive lifestyle interventions for the management of noncommunicable disease. It is, therefore, important for the sports and exercise physician to have an understanding of the therapeutic use of HRV modulation, both in the reduction of stress and in the management of chronic disease.
Collapse
Affiliation(s)
- Gabriell E Prinsloo
- MRC/UCT Research Unit for Exercise Science and Sports Medicine, University of Cape Town, Cape Town, South Africa.
| | | | | |
Collapse
|
33
|
Guimaraes PS, Huber DA, Campagnole-Santos MJ, Schreihofer AM. Development of attenuated baroreflexes in obese Zucker rats coincides with impaired activation of nucleus tractus solitarius. Am J Physiol Regul Integr Comp Physiol 2014; 306:R681-92. [PMID: 24573182 DOI: 10.1152/ajpregu.00537.2013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Adult obese Zucker rats (OZR; >12 wk) develop elevated sympathetic nerve activity (SNA) and mean arterial pressure (MAP) with impaired baroreflexes compared with adult lean Zucker rats (LZR) and juvenile OZR (6-7 wk). In adult OZR, baroreceptor afferent nerves respond normally to changes in MAP, whereas electrical stimulation of baroreceptor afferent fibers produces smaller reductions in SNA and MAP compared with LZR. We hypothesized that impaired baroreflexes in OZR are linked to reduced activation of brain stem sites that mediate baroreflexes. In conscious adult rats, a hydralazine (HDZ)-induced reduction in MAP evoked tachycardia that was initially blunted in OZR, but equivalent to LZR within 5 min. In agreement, HDZ-induced expression of c-Fos in the rostral ventrolateral medulla (RVLM) was comparable between groups. In contrast, phenylephrine (PE)-induced rise in MAP evoked markedly attenuated bradycardia with dramatically reduced c-Fos expression in the nucleus tractus solitarius (NTS) of adult OZR compared with LZR. However, in juvenile rats, PE-induced hypertension evoked comparable bradycardia in OZR and LZR with similar or augmented c-Fos expression in NTS of the OZR. In urethane-anesthetized rats, microinjections of glutamate into NTS evoked equivalent decreases in SNA, heart rate (HR), and MAP in juvenile OZR and LZR, but attenuated decreases in SNA and MAP in adult OZR. In contrast, microinjections of glutamate into the caudal ventrolateral medulla, a target of barosensitive NTS neurons, evoked comparable decreases in SNA, HR, and MAP in adult OZR and LZR. These data suggest that OZR develop impaired glutamatergic activation of the NTS, which likely contributes to attenuated baroreflexes in adult OZR.
Collapse
|
34
|
Iellamo F, Manzi V, Caminiti G, Vitale C, Castagna C, Massaro M, Franchini A, Rosano G, Volterrani M. Matched dose interval and continuous exercise training induce similar cardiorespiratory and metabolic adaptations in patients with heart failure. Int J Cardiol 2013; 167:2561-5. [DOI: 10.1016/j.ijcard.2012.06.057] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2012] [Revised: 06/13/2012] [Accepted: 06/16/2012] [Indexed: 11/26/2022]
|