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We start this article from Gilbert Ryle’s distinction between propositional knowledge, ‘knowing-that’, and procedural knowledge, ‘knowing-how’, and investigate how participants in interaction display orientation to the latter in various settings. As the knowledge of how things are done, know-how can be analyzed in terms of its relevance and consequentiality for parties in interaction. Similarly, as participants adjust their actions and understandings according to their sense of what they know and assume others to know, their know-how and its distribution may form the basis for adjusting and reshaping their actions, forms of participation and identities. In this sense, we aim at opening an investigation of know-how, and its conventionalized form, expertise, in interaction. In as much as it forms a distinct domain, a new research object – expertise in interaction – is formulated. Methodological issues of how to study expertise in interaction are discussed. The data are in English and Finnish.

Aims Alcohol, drugs and gambling are subject to governmental control policies and regulation. We have investigated how supporters of regulation/criminality of drug use and liberals advocating more lenient control provide arguments on the governmental control policies and regulation on addiction policies. Methods We organized three experiments in Helsinki, Finland, in 2023 on the argumentation on alcohol, drug and gambling policies. Altogether, 98 lay persons, mainly students at the University of Helsinki, participated in the experiments. As a method, we employed the imitation game, which can be used to measure how knowledgeable members of a social group are regarding the knowledge of another group. The method produces both quantitative and qualitative data. Results On drug policy, supporters and opponents of criminality of drug use were asymmetrically segregated. The opponents of criminality were in a minority and were more knowledgeable of the knowledge and beliefs of the majority supporting criminality. When it came to the alcohol and gambling policy fields, both supporters and opponents of regulation had more symmetrical relations. Conclusions The results can be used for addiction policies and anticipating emerging new lines of argumentation.

As a part of their normative theory of expertise, Harry Collins and Robert Evans proposed that interactional expertise forms the third kind of knowledge, located between formal propositional knowledge and embodied skills. Interactional expertise refers to the capability to grasp the conceptual structure of another’s social world, and it is expressed as the ability to speak fluently the language spoken in that social world. According to their theory, it is a key concept of sociology, because it refers to the understanding and coordination of joint actions between members of different social groups. Collins and Evans have further claimed that minority social group members tend to outpace majority social group members in terms of interactional expertise. Drawing on ethnomethodology, we detail the ways in which interactional expertise is displayed and revealed in experiments. This allowed us to specify the underlying reasons for the distribution of interactional expertise between social groups. Our results indicate that the difference between the groups depends on whether a group is either actively maintained or a passive latent category, because interactional expertise provides for not only the crossing of social boundaries but also their maintenance. The minority social group members’ greater interactional expertise or competence is therefore proven to be illusory.

Dog ownership has been reported to have beneficial effects on physical activity and emotional well-being, both known to reduce the risk for type 2 diabetes (T2D). The aim of this study was to evaluate the association between dog ownership during the whole life course and having T2D in later life. The study subjects consisted of 731 people (307 men and 424 women) from the Helsinki Birth Cohort Study. We assessed dog ownership with questionnaires, for every decade of life as well as current dog ownership. We investigated the associations between dog ownership and T2D with generalised estimating equation models and with generalised linear models. At a mean age of 71.0 (standard deviation [SD] 2.6) years, 13% of the participants had T2D. Dog ownership prior to the clinical examination was not associated with T2D (p ≥ 0.51). In men, but not in women, current dog owners had greater odds of having T2D compared with the non-owners when adjusted for age when clinically examined, socio-economic status, smoking, leisure-time physical activity, chronic diseases (OR = 3.32, 95% confidence interval 1.25-8.79, p = 0.016). In the age group of people around 70 years, dog ownership is not associated with reduced odds for developing T2D. Abbreviations: BMI: body mass index; CI: confidence interval; GEE: generalised estimating equation; HBCS: Helsinki Birth Cohort Study; KIHD: Kuopio Ischemic Heart Disease; LTPA: leisure-time physical activity; MET: metabolic equivalent of task; OGTT: oral glucose tolerance test; OR: Odds ratio; SD: standard deviation; SES: socio-economic status; T2D: type 2 diabetes

Epidemiological studies have shown that a number of nutrients are associated with better physical performance. However, little is still known about the role of the whole diet, particularly a healthy Nordic diet, in relation to physical performance. Therefore, we examined whether a healthy Nordic diet was associated with measures of physical performance 10 years later. We studied 1072 participants from the Helsinki Birth Cohort Study. Participants’ diet was assessed using a validated 128-item FFQ at the mean age of 61 years, and a priori-defined Nordic diet score (NDS) was calculated. The score included Nordic fruits and berries, vegetables, cereals, PUFA:SFA and trans-fatty acids ratio, low-fat milk, fish, red and processed meat, total fat and alcohol. At the mean age of 71 years, participants’ physical performance was measured using the Senior Fitness Test (SFT), and an overall SFT score was calculated. Women in the highest fourth of the NDS had on average 5 points higher SFT score compared with those in the lowest fourth (P for trend 0·005). No such association was observed in men. Women with the highest score had 17 % better result in the 6-min walk test, 16 % better arm curl and 20 % better chair stand results compared with those with the lowest score (all P values<0·01). In conclusion, a healthy Nordic diet was associated with better overall physical performance among women and might help decrease the risk of disability in old age.

Formulation, according to Garfinkel and Sacks (1986 [1969]), refers to speakers’ ways of talking about the current interaction. This article explores how formulations are used in clinical assessment interviews as a way of providing evidence of the respondent's capacities that are currently assessed. The videotaped data are drawn from the clinical interviews of unemployed adults and older persons. The data are analyzed using conversation analysis (CA). The article shows how formulation is achieved through vocalized and/or embodied actions (e.g. nodding, index finger pointing), in conjunction with the speaker's gaze directed to the recipient. It argues that these formulations enable access to the shared epistemic domain of the current interaction. This domain is an interactional achievement and, as a resource, it allows the participants to designate viewpoints regarding the respondent's social competence. In sum, the paper demonstrates how participants can show an explicit orientation to the interactional substrate of interview.

Health in adulthood is in part a consequence of development and growth taking place during sensitive periods in early life. It has not been explored previously whether early growth is associated with physical performance in old age from a life course perspective taking into account health-related behavior, biological risk factors, and early life experiences. At a mean age of 71 years, physical performance was assessed using the Senior Fitness Test (SFT) in 1078 individuals belonging to the Helsinki Birth Cohort Study. We used multiple linear regression analysis to assess the association between the SFT physical fitness scores and individual life course measurements. Several adult characteristics were associated with physical performance including socioeconomic status, lifestyle factors, and adult anthropometry. Higher birth weight and length were associated with better physical performance, even after adjusting for potential confounders (all p values <0.05). The strongest individual association between life course measurements and physical performance in old age was found for adult body fat percentage. However, prenatal growth was independently associated with physical performance seven decades later. These findings suggest that physical performance in old age is at least partly programmed in early life.

AimsTo assess whether disturbances in glucose regulation are associated with impairment in physical performance during a 10-year follow-up.Methods 475 Men and 603 women from the Helsinki Birth Cohort Study were studied. Glucose regulation was evaluated with a 2-h 75-g oral glucose tolerance test (OGTT) in 2001–2004. Subjects were categorised as having either impaired fasting glucose (IFG), impaired glucose tolerance (IGT), newly diagnosed diabetes or previously known diabetes. Physical performance was assessed approximately 10 years later using the validated senior fitness test (SFT). The relationship between glucose regulation and the overall SFT score was estimated using multiple linear regression models.ResultsThe mean age was 70.8 years for men and 71.0 years for women when physical performance was assessed. The mean SFT score for the whole population was 45.0 (SD 17.5) points. The SFT score decreased gradually with increased impairment in glucose regulation. Individuals with previously known diabetes had the lowest overall SFT score in the fully adjusted model (mean difference compared to normoglycaemic individuals − 11.56 points, 95% CI − 16.15 to − 6.98, p < 0.001). Both individuals with newly diagnosed diabetes and individuals with IGT had significantly poorer physical performance compared to those with normoglycaemia. No significant difference in physical performance was found between those with IFG and those with normoglycaemia.ConclusionsAmong older people, impaired glucose regulation is strongly related with poor physical performance. More severe disturbances in glucose regulation are associated with a greater decrease in physical function, indicating the importance of diagnosing these disturbances at an early stage.