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Muscle metaboreflex adaptations to exercise training in health and disease

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Abstract

Abnormalities in the muscle metaboreflex concur to exercise intolerance and greater cardiovascular risk. Exercise training benefits neurocardiovascular function at rest and during exercise, but its role in favoring muscle metaboreflex in health and disease remains controversial. While some authors demonstrated that exercise training enhanced the sensitization of muscle metabolically afferents and improved neurocardiovascular responses to muscle metaboreflex activation, others reported unaltered responses. This narrative review aimed to: (a) highlight the current evidence on the effects of exercise training upon cardiovascular and autonomic responses to muscle metaboreflex activation; (b) analyze the role of training components and indicate potential mechanisms of metaboreflex adaptations; and (c) address key methodological features for future research. Though limited, accumulated evidence suggests that muscle metaboreflex adaptations depend on the individual clinical status, exercise modality, and training duration. In healthy populations, most trials negated the hypothesis of metaboreflex improvement due to chronic exercise, irrespective of the training duration. Favorable changes in patients with impaired metaboreflex, particularly chronic heart failure, mostly resulted from long-term interventions (> 16 weeks) including aerobic exercise of moderate to high intensity, performed in isolation or within multimodal training. Potential mechanisms of metaboreflex improvements include enhanced sensitivity of channels and receptors, greater antioxidant capacity, lower metabolite accumulation, increased functional sympatholysis, and muscle perfusion. Future research should investigate: (1) the dose–response relationship of training components within different exercise modalities to elicit improvements in individuals showing intact or impaired muscle metaboreflex; and (2) potential and specific underlying mechanisms of metaboreflex improvements in individuals with different medical conditions.

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Abbreviations

ASICs:

Acid-sensing ion channels

BFR:

Blood flow restriction

CAT:

Catalase

CB1:

Cannabinoid receptor type-1

CHF:

Chronic heart failure

COX-2:

Cyclooxygenase-2

eNOS:

Nitric oxide synthase

EPR:

Exercise pressor reflex

ExT:

Exercise training

FITT:

Frequency, intensity time and type

MAP:

Mean arterial pressure

MSNA:

Muscle sympathetic nervous activity

MVC:

Maximal voluntary contraction

NO:

Nitric oxide

NR:

Not reported

OSA:

Obstructive sleep apnea

P2:

Purinergic receptors

PECA:

Post-exercise circulatory arrest

SBP:

Systolic blood pressure

SHR:

Spontaneously hypertensive rats

SOD:

Superoxide dismutase

TRPv1:

Transient receptor potential vanilloid type-1

VO 2:

Oxygen uptake

WKY:

Wistar-Kyoto

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Funding

This work was supported by the National Council for Technological and Scientific Development (CNPq, process 303629/2019-3, recipient PF) and Carlos Chagas Filho Foundation for Research Support in the State of Rio de Janeiro (FAPERJ, process E-26/110.184/2013, recipient PF, E-26/202.720/2019, E-26/010.100935/2018 recipient JPB).

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Contributions

GG and JPB: had the idea for the article, GG and MVSR: performed the literature search and data analysis, GG, PF and JPB drafted the manuscript, all authors critically revised the manuscript and approved its submission.

Corresponding author

Correspondence to Juliana Pereira Borges.

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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be considered a potential conflict of interest.

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Additional information

Communicated by Michael Lindinger .

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Gama, G., Farinatti, P., Rangel, M.V.S. et al. Muscle metaboreflex adaptations to exercise training in health and disease. Eur J Appl Physiol 121, 2943–2955 (2021). https://doi.org/10.1007/s00421-021-04756-8

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  • DOI: https://doi.org/10.1007/s00421-021-04756-8

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