What question did this study set out to answer?

This research aims to investigate how aging impacts the mechanical properties of rat diaphragm muscle, focusing on specific force and endurance.

June 14, 2026Journal of Applied Physiology

Aging Slows Maximum Shortening Velocity and Reduces Peak Power Output of Rat Diaphragm Muscle

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Authors

GHGenesis Hernandez-VizcarrondoMayo Clinic MFMatthew J. FogartyMayo Clinic HAHumzah AbdulkaderWinnMed

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Implication

Randomized trial reveals aging decreases peak power and maximum shortening velocity in rat diaphragm muscle, indicating muscle health decline with age.

Key Points

This research aims to investigate how aging impacts the mechanical properties of rat diaphragm muscle, focusing on specific force and endurance.
Mid-costal diaphragm strips excised from 6-month and 24-month Fischer 344 rats (n=16 total)
Muscle fibers stimulated using platinum plate electrodes to measure mechanical properties
Parameters assessed included maximum specific force, maximum shortening velocity, and peak power output at 26°C.
Maximum specific force decreased by ~35% in 24-month old rats compared to 6-month old rats
Maximum shortening velocity slowed by ~20% in aged rats
Peak power output was reduced by ~35%, while endurance during repetitive contractions remained unchanged.

Cite This Study

Hernandez-Vizcarrondo et al. (2026) studied this question.

synapsesocial.com/papers/6a2e46dbb1cc60ccdea8b8d6 https://doi.org/10.1152/japplphysiol.00148.2026

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Implication

Randomized trial reveals aging decreases peak power and maximum shortening velocity in rat diaphragm muscle, indicating muscle health decline with age.

Aging Slows Maximum Shortening Velocity and Reduces Peak Power Output of Rat Diaphragm Muscle

Discussion

Member takes

Implication

Key Points

Cite This Study

Aging Slows Maximum Shortening Velocity and Reduces Peak Power Output of Rat Diaphragm Muscle

Discussion

Member takes

Implication

Key Points

Cite This Study

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