Enhanced protein translation underlies improved metabolic and physical adaptations to different exercise training modes

Objective: To evaluate how different exercise training modes influence metabolic adaptation and mitochondrial remodeling. In this controlled intervention study, participants completed aerobic, interval, or comparative training programs and underwent muscle biopsy, metabolic testing, and functional assessment before and after training. Both aerobic and interval exercise improved fitness and metabolic markers, but the underlying molecular signatures differed by modality and participant age. Increases in protein translation, mitochondrial biogenesis-related pathways, and oxidative capacity were observed, supporting the idea that structured exercise induces broad cellular remodeling. Some older participants showed attenuated molecular responses relative to younger adults, although functional gains were still present. The study suggested that training adaptations are not uniform and that exercise prescription can shape molecular outcomes as well as performance. These findings reinforce exercise as a powerful metabolic intervention and provide mechanistic support for tailoring program design to age and training history. Larger and longer trials are needed to link molecular changes to clinical endpoints.