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BackgroundNational, regional and global scientific production and research capacity for physical activity - PA may contribute to improving public health PA policies and programs. There is an uneven distribution of research productivity by region and country income group, where countries with the highest burden of non-communicable diseases attributable to physical inactivity having low research productivity. A first step towards improving global research capacity is to objectively quantify patterns, trends, and gaps in PA research. This study describes national, regional and global trends and patterns of PA research from 1950 to 2019.MethodsA systematic review using searches in PubMed, SCOPUS and ISI Web of Knowledge databases was conducted in August 2017 and updated between January and May 2020. The review was registered at the PROSPERO database number CRD42017070153. PA publications per 100,000 inhabitants per country was the main variable of interest. Descriptive and time-trend analyses were conducted in STATA version 16.0.ResultsThe search retrieved 555,468 articles of which 75,756 were duplicates, leaving 479,712 eligible articles. After reviewing inclusion and exclusion criteria, 23,860 were eligible for data extraction. Eighty-one percent of countries (n = 176) had at least one PA publication. The overall worldwide publication rate in the PA field was 0.46 articles per 100,000 inhabitants. Europe had the highest rate (1.44 articles per 100,000 inhabitants) and South East Asia had the lowest (0.04 articles per 100,000 inhabitants). A more than a 50-fold difference in publications per 100,000 inhabitants was identified between high and low-income countries. The least productive and poorest regions have rates resembling previous decades of the most productive and the richest.ConclusionThis study showed an increasing number of publications over the last 60 years with a growing number of disciplines and research methods over time. However, striking inequities were revealed and the knowledge gap across geographic regions and by country income groups was substantial over time. The need for regular global surveillance of PA research, particularly in countries with the largest data gaps is clear. A focus on the public health impact and global equity of research will be an important contribution to making the world more active.

This longitudinal follow-up studied continued effects of parental influences on narrative identity in young adulthood. Decades of research have shown the importance of parental shared reminiscing and positive parenting for the development of children's and youths' autobiographical memory and narrative identity. Yet, research on long-term influences of parenting on narrative indices in adulthood is scarce, even though parents' traces remain a part of narrative identity throughout the life span (Köber & Habermas, 2018). Therefore, in this study, 118 individuals (at time 1: M[subscript age] = 17.3 years, SD = 0.77, 73% female, 82% White) reported at age 17 on their perceived positive parenting. As emerging and young adults, as part of follow-ups at ages 26 and again at 32, participants provided life story interviews. First, it was tested whether earlier positive parenting longitudinally predicted parents' traces in later life stories. Second, we studied the joint long-term prediction of parenting and parents' traces to several narrative features of these young adults' life stories, including emotional tone, coherent positive resolution, and narrative complexity. Results replicated prior research on parents' traces and showed moreover that perceived parenting shape offspring's narrative identity well into young adulthood. These long-term findings are consistent with the notion that narrative identity in adulthood is rooted in the family, and continuously shaped by experiences with parents.