An electrical stimulation intervention protocol to prevent disuse atrophy and muscle strength decline: an experimental study in rat.
Haiwang Shi, Fan Li, Fulong Zhang and 3 others
PMID 37386493WHAT IT FOUND
High-frequency electrical stimulation before tail suspension followed by low-frequency stimulation during tail suspension better preserved soleus mass, gastrocnemius force and fatigue in rats than other combinations.
It was tested only in rats.
Key findings
01Four weeks of tail suspension reduced soleus muscle mass by 39%, soleus fiber cross-sectional area by 58%, gastrocnemius fiber cross-sectional area by 51%, maximal gastrocnemius contractile force by 44%, and fatigue resistance by 39%.
02High-frequency electrical stimulation before or during tail suspension alleviated loss of soleus muscle mass.
03High-frequency pretreatment followed by low-frequency stimulation during tail suspension was the most effective combination for soleus fiber size, gastrocnemius contractile force and fatigue resistance, and soleus fiber type.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was done in rats, not in patients, so it does not show what works in humans. The authors state that tail suspension is not directly comparable to muscle atrophy and complications from aging, long-term bed rest, or other conditions. Only male rats were used, because female physiological cycles were considered an additional variable. Group sizes were small, with group numbers of 4, 5, or 6 rats depending on assignment. The authors state that further exploration is needed to determine the best way to apply these findings in practice. The Discussion says high-frequency stimulation during unloading is not recommended, but the study does not provide definitive proof for that conclusion.
Declared interests
Funding came from the National Natural Science Foundation of China and the Guangzhou Scientific Research Grant. The supplied text does not give a conflict-of-interest declaration.
The easy way to misread this
Do not use this to set electrical stimulation settings for patients. The most effective regimen was a combined high-frequency then low-frequency protocol tested only in rats, so the contribution of either component alone cannot be separated, and the authors state that the model is not directly comparable to human disuse atrophy.