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September 10, 2019Canadian Journal of Physiology and PharmacologyOpen Access

Combining an endurance swimming training protocol with 8 weeks of nandrolone decanoate treatment attenuated ventricular repolarization abnormalities but did not prevent cardiac autonomic dysfunction.

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Why the study?

High doses of synthetic anabolic androgenic steroids can cause serious negative cardiovascular effects, but their combined effects with exercise training on ventricular repolarization and cardiac autonomic modulation remained to be evaluated.

Does endurance exercise training prevent ventricular repolarization abnormalities and cardiac autonomic dysfunction induced by high-dose nandrolone decanoate in rats?

Population

Male Wistar rats

Comparison

Sedentary vehicle vs sedentary nandrolone decanoate vs swimming vehicle vs swimming nandrolone decanoate

Design

Animal study

Key result

Combining an endurance swimming training protocol with 8 weeks of nandrolone decanoate treatment attenuated ventricular repolarization abnormalities but did not prevent cardiac autonomic dysfunction.

Authors

MMMoacir MarocoloPKPedro L. KatayamaAMAnderson Meireles

Discussion

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Overview

Endurance training offers incomplete protection vs. nandrolone cardiotoxicity in rats; leaves open human translation and mechanisms.

Structured PICO

Does endurance exercise training prevent ventricular repolarization abnormalities and cardiac autonomic dysfunction induced by high-dose nandrolone decanoate in rats?

P
Population
40 male Wistar rats (aged 45 days) were randomized to evaluate the combined effects of 8 weeks of nandrolone decanoate treatment and swimming training on cardiac function.
I
Intervention
Nandrolone decanoate (10 mg/kg IM once weekly) combined with endurance swimming training (60 min/day, 5 days/week) for 8 weeks
C
Comparator
Sedentary rats treated with vehicle, sedentary rats treated with nandrolone decanoate, and trained rats treated with vehicle
O
Outcome
Ventricular repolarization (QT interval and QT dispersion) and cardiac autonomic modulation (heart rate variability)surrogate

Endurance exercise training attenuates ventricular repolarization abnormalities but fails to prevent cardiac autonomic dysfunction induced by high-dose anabolic steroids in rats.

Limitations

  • The animal model (rat) used in the present study may represent a limitation in translating the results to humans.
  • Cardiac repolarization properties differ between small rodents and humans.
  • The animal model (rat) may represent a limitation in translating the results to humans due to differences in cardiac repolarization properties

Cite This Study

Marocolo et al. (2019) studied this question. Nandrolone decanoate and swimming training vs. Vehicle (peanut oil with benzyl alcohol) and sedentary behavior was evaluated on Ventricular repolarization (QT interval and QT dispersion) and cardiac autonomic modulation (heart rate variability). Combining an endurance swimming training protocol with 8 weeks of nandrolone decanoate treatment attenuated ventricular repolarization abnormalities but did not prevent cardiac autonomic dysfunction.

synapsesocial.com/papers/6a2091f732c156e554b41d74https://doi.org/10.1139/cjpp-2019-0286
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1The blockade of angiotensin <scp>AT</scp><sub>1</sub> and aldosterone receptors protects rats from synthetic androgen‐induced cardiac autonomic dysfunction2012 · 30 citations
  2. 2Anabolic steroids induce cardiac renin-angiotensin system and impair the beneficial effects of aerobic training in rats2007 · 123 citations
  3. 3Effects of Anabolic Steroids and Endurance Exercise on Cardiac Performance1993 · 20 citations
  4. 4The Effects of High Doses of Nandrolone Decanoate on Cardiac Muscle Tissue2016 · 13 citations
  5. 5Early Left Ventricular Diastolic Dysfunction, Reduced Baroreflex Sensitivity, and Cardiac Autonomic Imbalance in Anabolic–Androgenic Steroid Users2021 · 15 citations