The study, conducted by Pınar Göbel of Gülhane School of Health Sciences at the University of Health Sciences in Ankara and Hilal Doğan Güney of the Nutrition and Diet Unit at the Safranbolu District Health Directorate in Karabuk, enrolled volunteer women who applied to a healthy living center in Turkey. The researchers chose a single-arm, pre-post design, meaning that all participants received the intervention and were compared against their own baseline measurements rather than against a control group. This approach is common in early-stage research because it allows scientists to assess feasibility, refine protocols and generate preliminary effect estimates before committing to the expense and complexity of a full randomized controlled trial.

The intervention itself was deliberately practical. For twelve weeks, participants received nutrition counseling and psychological support, and they were encouraged to walk regularly, accumulating at least 150 minutes of physical activity per week. That threshold corresponds to the minimum level of moderate activity recommended by major public health bodies worldwide, making the program something that could, in principle, be replicated in community settings without specialized equipment or supervision. There were no experimental drugs, no restrictive crash diets and no laboratory-based exercise regimens, just a coordinated package of dietary guidance, emotional support and a walking target that many older adults could realistically pursue.

To measure the program’s effects, the researchers deployed a battery of well-validated instruments. Sleep quality was assessed with the Pittsburgh Sleep Quality Inventory, or PSQI, a questionnaire widely regarded as the standard tool for capturing subjective sleep disturbances, including difficulties falling asleep, nighttime awakenings and daytime dysfunction. Psychological well-being was tracked with the Psychological Well-Being Scale in the Elderly, abbreviated as PWBSE, which probes dimensions of emotional and existential health in later life. Physical activity levels were quantified using the short form of the International Physical Activity Questionnaire, known as IPAQ, a tool designed for population surveillance of movement and sedentary behavior.

Beyond the questionnaires, the team collected objective data. Anthropometric measurements, which typically include body weight, body mass index and related indices of body composition, were recorded at baseline and again at the end of the intervention. Blood samples were drawn to assess biochemical parameters, providing a window into metabolic health that self-report alone cannot supply. This combination of subjective and objective endpoints matters because lifestyle interventions often produce changes that participants feel before they can be measured, and conversely, because measurable metabolic shifts can occur even when a person’s subjective sense of change is muted.

The results were striking in their consistency. At week twelve, compared with baseline, participants showed significant improvements in their PWBSE scores, their IPAQ scores and their PSQI scores, with all three comparisons reaching the p < 0.001 threshold, a level of statistical significance that indicates the observed changes would be extremely unlikely to arise from chance alone. In practical terms, the women reported sleeping better, moving more and feeling psychologically stronger after three months of the combined program. The fact that sleep quality improved alongside activity and well-being is particularly noteworthy, given that poor sleep is both common in older adults and closely intertwined with obesity, mood disorders and cardiovascular risk.

The biochemical and anthropometric data told a similar story. Blood parameters showed significant positive changes over the course of the intervention, and the researchers highlighted one finding in particular: high-density lipoprotein, or HDL, the cholesterol fraction often described as protective for cardiovascular health, increased significantly by week twelve. Rising HDL in the context of a lifestyle program is a meaningful signal, because higher levels of this lipoprotein are associated with more efficient reverse cholesterol transport, the process by which cholesterol is carried away from artery walls back to the liver. Meanwhile, the anthropometric measurements also shifted in a favorable direction, suggesting that the women’s body composition improved over the twelve weeks.

Why might a combined intervention outperform what any single component might achieve on its own? The researchers’ multimodal framework reflects an increasingly influential view in geriatric health: that sleep, diet, physical activity and psychological state form an interlocking system. Regular moderate exercise is known to deepen slow-wave sleep and stabilize circadian rhythms, while better sleep in turn regulates appetite hormones such as leptin and ghrelin, making dietary change easier to sustain. Psychological support may reinforce both threads by reducing stress-related eating and improving adherence to the walking target. The significant gains in well-being observed in this study are consistent with that feedback-loop model, in which progress in one domain cascades into the others.

The study’s limitations are as important as its findings. Because there was no control group, some of the improvement could reflect regression to the mean, placebo effects, the simple passage of time or the attention participants received from the research team, a phenomenon sometimes called the Hawthorne effect. The sample of thirty-six women recruited from a single healthy living center in Turkey is small and may not represent older women elsewhere. The authors themselves are explicit on this point: their preliminary findings suggest that a twelve-week multimodal intervention may be associated with improvements in sleep quality, body composition and biochemical parameters in older women, but future randomized controlled trials are needed to confirm these initial observations. The study was retrospectively registered at ClinicalTrials.gov under the identifier NCT07740902, received ethics approval from the Karabuk University Non-Interventional Clinical Research Ethics Committee and was conducted with informed consent from all participants in accordance with the Helsinki declaration.

Even with those caveats, the research carries real weight for anyone thinking about healthy aging. Sleep disturbances, weight gain and metabolic decline are among the most common complaints of later life, and pharmacological options for addressing them are limited or carry side effects. A program built from nutrition counseling, psychological support and 150 minutes of weekly walking is inexpensive, scalable and low-risk. If larger controlled trials replicate what this pilot observed, the implications could extend well beyond research clinics, pointing toward community-based lifestyle programs as a frontline tool for helping older women sleep more soundly, move more freely and age with healthier bodies and minds.

Subject of Research: Effects of a 12-week multimodal lifestyle intervention on sleep quality and body composition in older women

Article Title: Changes in sleep quality and body composition following a multimodal lifestyle intervention in older women: a single-arm pilot study

Article References: Göbel, P., & Güney, H. D. (2026). Changes in sleep quality and body composition following a multimodal lifestyle intervention in older women: a single-arm pilot study. BMC Geriatrics. https://doi.org/10.1186/s12877-026-08322-9

Image Credits: AI Generated

DOI: 10.1186/s12877-026-08322-9

Keywords: sleep quality, body composition, older women, lifestyle intervention, obesity, physical activity, nutrition counseling, psychological well-being, HDL cholesterol, pilot study, healthy aging, PSQI