Can we optimise the exercise training prescription to maximise improvements in mitochondria function and content?
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing rodent and human experimental studies without systematic methodology
PubMed 24128929 · doi:10.1016/j.bbagen.2013.10.012
What was done
The authors conducted a narrative review of cross-sectional and training studies in both rats and humans to examine the distinct impacts of exercise intensity and exercise volume on mitochondrial function (measured by mitochondrial respiration) and mitochondrial content (assessed via citrate synthase activity).
What was found
The abstract reports no numerical values or effect sizes. Qualitatively, exercise training intensity was reported as an important determinant of mitochondrial function rather than content, whereas training volume was reported as a primary determinant of mitochondrial content. These adaptations were noted to reverse quickly after activity reduction or cessation.
Why it matters
Identifying separate training determinants for mitochondrial quality versus quantity helps guide more precise exercise prescriptions for metabolic health and athletic performance.
Limits
The review relies on a small body of literature combining rodent and human studies without meta-analytic pooling. Quantitative effect sizes are not reported in the abstract, and adaptations across specific mitochondrial sub-populations, muscle fiber types, and genetic backgrounds remain uncharacterized.
Cited by
- supports Physical exercise training can double the amount of mitochondrial mass in human muscle.