Abstract
Background
Previous evidence showed that cellular aging is a multifactorial process that is associated with decline in mitochondrial function. Physical exercise has been proposed as an effective and safe therapeutical intervention to improve the mitochondria network in the adult myocytes.
Aims
The aim of this systematic review of randomized controlled trials (RCTs) was to assess the exercise-induced muscle mitochondria modifications in older adults, underlining the differences related to different exercise modalities.
Methods
On November 28th, 2021, five databases (PubMed, Scopus, Web of Science, Cochrane, and PEDro) were systematically searched for RCTs to include articles with: healthy older people as participants; physical exercise (endurance training (ET), resistance training (RT), and combined training (CT)) as intervention; other different exercise modalities or physical inactivity as comparator; mitochondrial modifications (quality, density and dynamics, oxidative, and antioxidant capacity) as outcomes. The quality assessment was performed according to the PEDro scale; the bias risk was evaluated by Cochrane risk-of-bias assessment tool.
Results
Out of 2940 records, 6 studies were included (2 assessing ET, 2 RT, 1 CT, and 1 both ET and RT). Taken together, 164 elderly subjects were included in the present systematic review. Significant positive effects were reported in terms of mitochondrial quality, density, dynamics, oxidative and antioxidant capacity, even though with different degrees according to the exercise type. The quality assessment reported one good-quality study, whereas the other five studies had a fair quality.
Discussion
The overall low quality of the studies on this topic indicate that further research is needed.
Conclusion
RT seems to be the most studied physical exercise modality improving mitochondrial density and dynamics, while ET have been related to mitochondrial antioxidant capacity improvements. However, these exercise-induced specific effects should be better explored in older people.
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Study design and conceptualization: LL, AdS, and MI; Database searching: LL, AdS, MI; Data screening: LL, AdS, MI; Data extraction LL, AdS, MI; Data synthesis and interpretation: LL, AdS, MI; Manuscript drafting: LL, AdS; Critical revision: NF, MI; Visualization: KM, CC, LP, AT, SA, AA; Study supervision: AdS, MI; Study submission: AdS. All authors read and approved the final version of the manuscript.
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Lippi, L., de Sire, A., Mezian, K. et al. Impact of exercise training on muscle mitochondria modifications in older adults: a systematic review of randomized controlled trials. Aging Clin Exp Res 34, 1495–1510 (2022). https://doi.org/10.1007/s40520-021-02073-w
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DOI: https://doi.org/10.1007/s40520-021-02073-w