A recent discussion in the longevity research community highlights the need for a rigorous definition and measurement of **intrinsic capacity (IC) in aging, as proposed by the World Health Organization (WHO). This concept encompasses a composite of physical and mental capacities, yet the scientific community lacks a standardized framework for its assessment. The ambiguity surrounding IC measurement has led to varied approaches and a proliferation of studies attempting to correlate IC with other health metrics, such as epigenetic age, but without a consensus on methodology. This situation underscores the urgency for a clear operational definition that can facilitate comparability across studies and enhance the understanding of aging dynamics.**

The implications of establishing a robust measurement framework for IC are profound. By leveraging animal models, particularly those with shorter lifespans like mice and killifish, researchers can conduct longitudinal studies to track IC changes over time. These models can provide valuable insights into the mechanisms underlying aging and the interplay between different domains of IC—cognition, locomotion, vitality, sensory function, and psychological capacity. Such investigations could lead to the identification of modifiable risk factors and therapeutic targets, ultimately informing clinical practices aimed at promoting healthy aging.

The advancement of IC measurement methodologies could significantly shift current research paradigms in aging biology. By focusing on longitudinal assessments in animal models, researchers may expedite the translation of findings to human healthspan interventions. This approach not only enhances our understanding of aging mechanisms but also aligns with the growing emphasis on personalized medicine, where individual variations in IC can inform tailored therapeutic strategies. As the field progresses, establishing a consensus on IC measurement will be critical for fostering collaboration and ensuring that research outcomes translate effectively into clinical applications.

Source: fightaging.org