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Hemodynamic and neuromuscular basis of reduced exercise capacity in patients with end-stage renal disease

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

The present study aimed to characterize the exercise-induced neuromuscular fatigue and its possible links with cerebral and muscular oxygen supply and utilization to provide mechanistic insights into the reduced exercise capacity characterizing patients with end-stage renal disease (ESRD).

Methods

Thirteen patients with ESRD and thirteen healthy males (CTR group) performed a constant-force sustained isometric contraction at 50% of their maximal voluntary isometric contraction (MVC) until exhaustion. Quadriceps muscle activation during exercise was estimated from vastus lateralis, vastus medialis, and rectus femoris EMG. Central and peripheral fatigue were quantified via changes in pre- to postexercise quadriceps voluntary activation (ΔVA) and quadriceps twitch force (ΔQtw,pot) evoked by supramaximal electrical stimulation, respectively. To assess cerebral and muscular oxygenation, throughout exercise, near-infrared spectroscopy allowed investigation of changes in oxyhemoglobin (∆O2Hb), deoxyhemoglobin (∆HHb), and total hemoglobin (∆THb) in the prefrontal cortex and in the vastus lateralis muscle.

Results

ESRD patients demonstrated lower exercise time to exhaustion than that of CTR (88.8 ± 15.3 s and 119.9 ± 14.6 s, respectively, P < 0.01). Following the exercise, MVC, Qtw,pot, and VA reduction were similar between the groups (P > 0.05). There was no significant difference in muscle oxygenation (∆O2Hb) between the two groups (P > 0.05). Cerebral and muscular blood volume (∆THb) and oxygen extraction (∆HHb) were significantly blunted in the ESRD group (P < 0.05). A significant positive correlation was observed between time to exhaustion and cerebral blood volume (∆THb) in both groups (r2 = 0.64, P < 0.01).

Conclusions

These findings support cerebral hypoperfusion as a factor contributing to the reduction in exercise capacity characterizing ESRD patients.

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Data availability

The data may be shared upon reasonable request to the corresponding author if the request is accepted by the Regional Research Committee for Medical and Health Research Ethics and the local Data Protection Official.

Abbreviations

ANOVA:

Analysis of variance

CTR:

Control

CKD:

Chronic kidney disease

ESRD:

End-stage renal disease

HHb:

Deoxyhemoglobin

MVC:

Maximal voluntary contraction

O2Hb:

Oxyhemoglobin

Qtw,pot :

Twitch force

RMS:

Root mean square

THb:

Total hemoglobin

Tlim:

Time limit

VA:

Voluntary activation

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Funding

The authors reported there is no funding associated with the work featured in this article.

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Authors and Affiliations

Authors

Contributions

AM and ST: identified study plot, collected clinical data, performed statistical analysis, and drafted and approved the manuscript. HBHH and NF: identified study plot, were responsible for application to the committee of ethics, performed statistical analysis, and drafted and approved the manuscript. HIHA and MAB: drafted application to the committee of ethics, organized database, and reviewed and approved the manuscript. HC: collected clinical data, performed statistical analysis, and drafted and approved the manuscript.

Corresponding author

Correspondence to Mohamed Amine Bouzid.

Ethics declarations

Conflict of interest

There are no potential conflicts of interest to be reported in relation to this article.

Ethical approval

The study received approval from the Regional Research Ethics Committee (CPP SUD No. 11/2019).

Consent to participate

All subjects gave written informed consent in accordance with the Declaration of Helsinki.

Additional information

Communicated by Westerterp/Westerblad.

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Machfer, A., Tagougui, S., Zghal, F. et al. Hemodynamic and neuromuscular basis of reduced exercise capacity in patients with end-stage renal disease. Eur J Appl Physiol (2024). https://doi.org/10.1007/s00421-024-05427-0

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  • DOI: https://doi.org/10.1007/s00421-024-05427-0

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