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Over the course of the physical activity transition, machines have largely replaced skeletal muscle as the source of work for locomotion and other forms of occupational physical activity in industrial environments. To better characterize this transition and its effect on back muscles and the spine, we tested to what extent typical occupational activities of rural subsistence farmers demand higher magnitudes and increased variability of back muscle activity and spinal loading compared to occupational activities of urban office workers in Rwanda, and whether these differences were associated with back muscle endurance, the dominant risk factor for back pain. Using electromyography, inertial measurement units, and OpenSim musculoskeletal modeling, we measured back muscle activity and spinal loading continuously while participants performed occupational activities for one hour. We measured back muscle endurance using electromyography median frequency analysis. During occupational work, subsistence farmers activate their back muscles and load their spines at 390% higher magnitudes and with 193% greater variability than office workers. Partial correlations accounting for body mass show magnitude and variability response variables are positively associated with back muscle endurance (R = 0.39–0.90 [P < 0.001–0.210] and R = 0.54–0.72 [P = 0.007–0.071], respectively). Body mass is negatively correlated with back muscle endurance (R = -0.60, P = 0.031), suggesting higher back muscle endurance may be also partly attributable to having lower body mass. Because higher back muscle endurance is a major factor that prevents back pain, these results reinforce evidence that under-activating back muscles and under-loading spines at work increases vulnerability to back pain and may be an evolutionary mismatch. As sedentary occupations become more common, there is a need to study the extent to which occupational and leisure time physical activities that increase back muscle endurance helps prevent back pain. [ABSTRACT FROM AUTHOR]

Objective: To measure confidence and attitudes of the current and emerging interprofessional workforce concerning osteoarthritis (OA) care. Methods: Study design is a multinational (Australia, New Zealand, Canada) cross‐sectional survey of clinicians (general practitioners [GPs], GP registrars, primary care nurses, and physiotherapists) and final‐year medical and physiotherapy students. GPs and GP registrars were only sampled in Australia/New Zealand and Australia, respectively. The study outcomes are as follows: confidence in OA knowledge and skills (customized instrument), biomedical attitudes to care (Pain Attitudes Beliefs Scale [PABS]), attitudes toward high‐ and low‐value care (customized items), attitudes toward exercise/physical activity (free‐text responses). Results: A total of 1886 clinicians and 1161 students responded. Although a number of interprofessional differences were identified, confidence in OA knowledge and skills was consistently greatest among physiotherapists and lowest among nurses (eg, the mean difference [95% confidence interval (CI)] for physiotherapist‐nurse analyses were 9.3 [7.7‐10.9] for knowledge [scale: 11‐55] and 14.6 [12.3‐17.0] for skills [scale: 16‐80]). Similarly, biomedical attitudes were stronger in nurses compared with physiotherapists (6.9 [5.3‐8.4]; scale 10‐60) and in medical students compared with physiotherapy students (2.0 [1.3‐2.7]). Some clinicians and students agreed that people with OA will ultimately require total joint replacement (7%‐19% and 19%‐22%, respectively), that arthroscopy is an appropriate intervention for knee OA (18%‐36% and 35%‐44%), and that magnetic resonance imaging is informative for diagnosis and clinical management of hip/knee OA (8%‐61% and 21%‐52%). Most agreed (90%‐98% and 92%‐97%) that exercise is indicated and strongly supported by qualitative data. Conclusion: Workforce capacity building that de‐emphasizes biomedical management and promotes high‐value first‐line care options is needed. Knowledge and skills among physiotherapists support leadership roles in OA care for this discipline. [ABSTRACT FROM AUTHOR]