Physical activity is generally associated with better psychological well-being, yet the role of sedentary behavior as a distinct contributor to perceived stress remains insufficiently understood. This study aimed to examine the associations of total physical activity and sedentary behavior with perceived stress and its components in a cross-sectional sample. A total of 40 adults (24 females) participated in the study. Perceived stress was assessed using the 10-item Perceived Stress Scale (PSS-10), including total score and subcomponents of helplessness and self-efficacy. Physical activity and sedentary behavior were assessed using the International Physical Activity Questionnaire (IPAQ-SF). Multiple linear regression analyses were conducted to examine associations between physical activity indicators and perceived stress outcomes, adjusting for sex and age. Sedentary behavior was positively associated with total perceived stress (B = 0.35, 95% CI [0.08, 0.62], p = .018) and perceived helplessness (B = 0.41 [0.14, 0.68], p = .005), but not with self-efficacy (B = −0.01 [−0.34, 0.32], p = .941). Total physical activity was not significantly associated with any perceived stress outcome (all p ≥ .556), suggesting that sitting time, rather than overall activity volume, was more consistently related to perceived stress. Sedentary behavior appears to be more strongly related to perceived stress than total physical activity. Interventions targeting stress regulation may benefit from focusing not only on increasing physical activity but also on reducing prolonged sitting.

The aim of this study was to determine the isokinetic profile of shoulder internal and external rotators in judo and karate female elite athletes.; Methods: Study sample consisted of senior 13 female karate athletes (21.23 ± 2.83 years) and 13 female judokas (21.00 ± 2.51 years). For testing the isokinetic muscle strength of the external and internal rotation of the shoulder joint, the HUMAN NORM isokinetic dynamometer has been used. Testing the maximum muscle strength of subjects was carried out at an angular speed of 60º / sec and 180 º / sec; Results: Judo female athletes had higher isokinetic peak torque for right and left shoulder internal rotators than karate athletes at 60º/s and 180º/s, with a large effect size, Cohen’s d = 0.89, 1.02, 0.97, 0.95, respectively. Also, large differences were observed between the judo and karate subjects in peak muscle torques of the right shoulder external shoulder rotator muscles of both limbs were greater in judokas than karate athletes. Isokinetic testing should be an integral part of training process in combat sports because in order to decrease the number of injuries and improve performance.