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Author Spotlight: Exploring the Impact of Reduced Resistance Exercise Volume on Metabolic Health

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Decrease in myostatin by ladder-climbing training is associated with insulin resistance in diet-induced obese rats.

Liang Tang¹, Kai Luo¹, Chentao Liu²

¹Institute of Sports Biology, Shaanxi Normal University, Xi'an, Shaanxi 710062, China.

Chinese Medical Journal

|June 17, 2014

Summary

Ladder-climbing training (LCT) reduced insulin resistance (IR) in obese rats by suppressing myostatin (MSTN). This exercise intervention activated key signaling pathways, improving glucose uptake and insulin sensitivity.

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A Chronic High-Intensity Interval Training and Diet-Induced Obesity Model to Maximize Exercise Effort and Induce Physiologic Changes in Rats

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Published on: April 28, 2023

Area of Science:

Exercise Physiology
Metabolic Health
Molecular Biology

Background:

Myostatin (MSTN) suppression is linked to muscle atrophy and insulin resistance (IR).
The specific effects of ladder-climbing training (LCT) on MSTN and IR require further investigation.
Understanding the molecular mechanisms connecting LCT, MSTN, and IR is crucial for metabolic disease management.

Purpose of the Study:

To investigate the correlation between LCT and IR in diet-induced obese rats.
To elucidate the signaling pathways through which MSTN suppression by LCT influences IR.
To assess the impact of LCT on MSTN levels and related metabolic markers.

Main Methods:

Rats were fed either a normal pellet diet (NPD) or a high-fat diet (HFD).
HFD rats were divided into sedentary (HFD-S) and LCT groups for 8 weeks.
Western blotting, immunohistochemistry, and enzyme assays measured MSTN, GLUT4, PI3K, Akt, and downstream targets.

Main Results:

LCT significantly improved IR and insulin sensitivity in HFD rats.
MSTN protein and receptor mRNA levels decreased post-LCT.
LCT enhanced PI3K activity, Akt phosphorylation, GLUT4 expression, and mTOR phosphorylation, while inhibiting FoxO1 phosphorylation.

Conclusions:

LCT effectively reduces IR in diet-induced obese rats.
MSTN plays a significant role in LCT-mediated regulation of IR and fat accumulation.
The PI3K/Akt/mTOR and PI3K/Akt/FoxO1 signaling pathways are implicated in LCT's effects on IR.