THC, Alcohol and Skeletal Muscle: Why Tissue Type Changed the Laboratory Response

forensic toxicology working group members October 28, 2026 Forensic Toxicology

THC aggravated alcohol-related mitochondrial impairment in one young-rat skeletal-muscle preparation, but the interaction was not uniform across muscles and ages. The study measured laboratory respiration, not a human probability of weakness, muscle injury or disability.

The experimental material matters

Researchers used skeletal muscles from young and middle-aged male rats. They compared predominantly glycolytic gastrocnemius with more oxidative soleus tissue and exposed preparations to ethanol and THC in a respiration chamber.

There were four young and three middle-aged animals, with repeated experimental runs. Additional runs improve characterization of a preparation; they are not additional independent animals.

A specific interaction

Ethanol reduced mitochondrial respiration. Adding THC worsened that response in young gastrocnemius. The soleus and age comparisons showed different degrees of susceptibility.

This pattern supports an interaction influenced by metabolic phenotype and age, rather than an identical toxic effect in every muscle. The distinction is also important because ethanol was part of the experimental exposure and cannot be ignored when attributing the response to THC.

Why the percentage is not a clinical risk

A percentage decrease in oxygen consumption is an assay result. It is not a percentage probability of developing muscle disease or a measure of driving impairment. The preparation lacks normal circulation, absorption and whole-body compensation.

The authors also emphasized the difficulty of comparing concentrations across different tissue preparations. A laboratory chamber concentration cannot simply be relabeled as a person’s blood result. For an individual muscle-injury opinion, clinical history, timing, alternative causes and direct evidence of injury remain necessary.