The aim of the present study was to examine the psychometric properties of the Lithuanian translation of State Mindfulness in Physical Activity (SMS-PA-2) in a sample of physically active students. A total sample of 539 students from universities and colleges (50.3% men; mean age 23.3 ± 7.2 years) were asked to provide demographical data, report physical activity (PA) and PA habits and fill in measures of trait awareness, autonomous motivation in physical activity, trait body appreciation, trait body functionality appreciation and disordered eating attitudes and behaviours and self-esteem via an online anonymous survey. Students also provided information about their participation in organized team sports, organized individual sports, recreational sports and home exercise. Results. The SMS-PA-2 replicated the original four-factor structure, with good internal consistency (except for the Accepting Mind subscale). Invariance analyses across sex groups revealed an acceptable fit of the configural, metric and scalar models. However, in the multi-group analysis, metric invariance and scalar invariance were not confirmed. The SMS-PA-2 was positively associated with leisure-time PA, PA habits, more self-determined motivation for exercise, trait awareness, trait body appreciation, trait body functionality appreciation and self-esteem. A negative association was observed between the SMS-PA-2 and disordered eating attitudes and behaviours. Home exercisers and students engaged in team sports demonstrated lower levels of state mindfulness in PA than those engaged in organized individual and recreational sports. The Lithuanian version of the SMS-PA-2 is a reliable and valid instrument for measuring state mindfulness in PA. This instrument is recommended for researchers who aim to investigate the role of state mindfulness in the PA in Lithuanian-language-speaking samples of young adults. Future studies should explore the Lithuanian version of the SMS-PA-2 by asking participants to fill questionnaires in immediately after the PA session, and measurement invariance between sexes should be further tested.
Keywords: body image; exercise; mindfulness; monitor and acceptance theory (MAAT); motivation; psychometric properties.