Human Mechanistic Training Study • 2017 • Robinson and colleagues; Cell Metabolism
Research Summary
This study compared adaptations to different exercise modes in younger and older adults. Over 12 weeks, high-intensity interval, resistance and combined training produced changes in insulin sensitivity and lean mass, while interval and combined training improved aerobic capacity and skeletal-muscle mitochondrial respiration. The investigators also examined protein-related mechanisms that help explain how muscle tissue adapts. The findings show that older human muscle retains substantial capacity to respond to training, which is a useful counterpoint to fatalistic descriptions of ageing. However, the study measured physiological and molecular outcomes over a limited period. It did not establish that interval training reverses whole-body ageing, extends lifespan or is the best starting point for every older person. The results also distinguish muscle power training from aerobic intervals: they are different training concepts with different primary goals.
Evidence and limitations: Short-term human mechanisms; not proof of lifespan extension
Catalogue reference: KL-025. Source reviewed: 27 September 2026. This summary is independent of the publisher.