Bioenergetics, Fatigability, and Activity Limitations in Aging (R01) | Apply Online

Opportunity Summary:

The Bioenergetics, Fatigability, and Activity Limitations in Aging (R01) opportunity (Funding Opportunity Number PA-09-190) is a National Institutes of Health (NIH) funding announcement that supports full-scale Research Project Grant (R01) applications focused on why older adults often experience greater fatigability and how that fatigability contributes to real-world activity limitations. The opportunity is led by the National Institute on Aging (NIA) with participation from the National Heart, Lung, and Blood Institute (NHLBI), the National Institute of Nursing Research (NINR), the Office of Research on Women's Health (ORWH), and the Office of Dietary Supplements (ODS). At its core, the announcement is trying to move the field toward a clearer, more mechanistic understanding of how age-related changes in bioenergetics (how the body produces, uses, and regulates energy) can raise the sense and physiological reality of fatigue, which in turn restricts physical movement, daily functioning, and even cognitive activity for many older adults.

A central idea behind the FOA is that "fatigability" is not just feeling tired in a general way; it is often understood as fatigue in relation to a defined task or level of exertion. Older adults may become fatigued more quickly at activity levels that used to be manageable, leading to reduced participation in exercise, mobility, work-like tasks, and social activities, and potentially triggering a downward spiral of deconditioning and further limitation. The NIH is signaling that bioenergetic disruptions may be a key driver of this process, including alterations in energy production and utilization and the biological regulation of those pathways. In practical terms, the FOA is encouraging studies that connect measurable bioenergetic changes to measurable declines in function and task performance, rather than treating fatigue as a vague or purely subjective complaint.

The announcement highlights three broad categories of research that applicants are encouraged to pursue. First, it calls for projects that identify and explain specific alterations in bioenergetics that are associated with increased fatigability and activity limitations in aging. This could include pinpointing which energy-related pathways, tissues, or regulatory systems change with age in ways that make common activities more physiologically costly, less efficient, or harder to sustain. Second, it encourages the development and evaluation of better measures of fatigability that are meaningfully tied to bioenergetic processes. This reflects an interest in improved measurement tools that can reliably quantify fatigability and link it to underlying energy metabolism, potentially helping researchers and clinicians detect problems earlier, compare results across studies, and evaluate whether an intervention is truly affecting the intended biological mechanism. Third, it supports intervention research aimed at reducing fatigability and activity limitations by targeting bioenergetic alterations, with an explicit emphasis on outcomes that matter to older adults, such as improved function and quality of life. In other words, the FOA is not only about describing mechanisms; it also aims to translate those insights into strategies that could help older adults stay active and independent.

From a funding structure standpoint, this opportunity uses the NIH R01 mechanism, which is the standard grant format for hypothesis-driven, multi-year research projects with substantial scope. The FOA is also explicitly linked to parallel announcements of identical scientific scope that use smaller or earlier-stage mechanisms: an R03 (PA-09-192) for small research grants and an R21 (PA-09-191) for exploratory or developmental projects. That structure is meant to accommodate projects at different stages, from early proof-of-concept work to more mature, comprehensive studies.

In terms of administrative details, the opportunity falls under the NIH and is categorized as a discretionary grant in the health and education-related research space. It does not require cost sharing or matching. It was posted and created on June 3, 2009, with an original and final closing date of September 7, 2012, and an archive date of October 8, 2012, meaning it is no longer open for new applications under that specific announcement. It is associated with CFDA numbers that reflect the participating NIH areas, including Aging Research (93.866), Cardiovascular Diseases Research (93.837), and Nursing Research (93.361), which also hints at the cross-cutting nature of the science being sought (aging biology, functional outcomes, cardiopulmonary capacity, and clinical or care-relevant measurement and intervention work).

Eligibility is broad and includes many types of domestic and non-domestic entities. Eligible applicants listed include public and private institutions of higher education, state and local governments (including counties, cities/townships, special districts), federally recognized tribal governments and other tribal organizations, public housing authorities/Indian housing authorities, independent school districts, nonprofits with and without 501(c)(3) status, small businesses, and for-profit organizations (including those that are not small businesses). The FOA also specifies additional eligible categories such as Alaska Native and Native Hawaiian Serving Institutions, Hispanic-serving institutions, Historically Black Colleges and Universities (HBCUs), Tribally Controlled Colleges and Universities (TCCUs), faith-based and community-based organizations, U.S. territories or possessions, regional organizations, foreign organizations, and certain eligible federal agencies. This wide eligibility reflects NIH's intent to attract multidisciplinary teams and diverse research settings that can address mechanistic biology, measurement development, and intervention testing.

Overall, this funding opportunity is aimed at advancing a more integrated science of aging-related fatigability by linking the lived experience of reduced endurance and activity with underlying energy metabolism and regulation. It supports projects that can clarify mechanisms, improve how fatigability is quantified in research and clinical contexts, and test interventions that address bioenergetic dysfunction in ways that translate into better function and quality of life for older adults.

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