RT journal article T1 Trends in adherence to the muscle-strengthening activity guidelines in the US over a 20-year span A1 Calatayud, Joaquín A1 López Bueno, Rubén A1 Núñez Cortés, Rodrigo A1 Pozo Cruz, Borja del A1 Andersen, Lars Louis A2 Didáctica de la Educación FísicaPlástica y Musical K1 Strength training K1 Resistance training K1 Physical activity K1 Public health AB Purpose: Purpose to evaluate the prevalence and temporal trends in adherence to muscle-strengthening activity(MSA) guidelines among the US population from 1997 to 2018 (pre-Covid 19).Methods: We used nationally representative data from the National Health Interview Survey of the US (NHIS; across-sectional household interview survey). We pooled data from 22 consecutive cycles (1997 to 2018) andestimated prevalence and trends of adherence to MSA guidelines among adults aged 18–24 years, 25–34 years,35–44 years, 45–64 years, and ≥ 65 years.Results: A total of 651,682 participants (mean age 47.7 years [SD = 18.0], 55.8% women) were included. Theoverall prevalence of adherence to MSA guidelines significantly increased (p < .001) from 1997 to 2018 (19.8%to 27.2%, respectively). Adherence levels significantly increased (p < .001) for all age groups from 1997 to 2018.Compared with their white non-Hispanic counterparts, the odds ratio for Hispanic females was 0.5 (95% CI =0.4–0.6).Conclusions: It is over a 20-year span, adherence to MSA guidelines increased across all age groups, although theoverall prevalence remained below 30%. Future intervention strategies to promote MSA are required with aparticular focus on older adults, women, Hispanic women, current smokers, those with low educational levels,and those with functional limitations or chronic conditions. PB Elsevier SN 1873-7714 YR 2023 FD 2023 LK http://hdl.handle.net/10498/31467 UL http://hdl.handle.net/10498/31467 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 12-nov-2026