S36 Abstracts / Journal of Science and Medicine in Sport 22(S2) (2019) S17–S74 O43 Are musculoskeletal benefits of 8 months high-intensity exercise maintained in postmenopausal women with low bone mass? LIFTMOR trial follow-up K. Myers 1,2,* , S. Watson 1,2 , B. Weeks 1,2 , L. Weis 3 , B. Beck 1,2,3 1 School of Allied Health Sciences, Griffith University 2 Menzies Health Institute Queensland 3 The Bone Clinic Introduction: The skeletal response to mechanical loading is dependent on the nature of the applied load. Optimal osteogenic loads induce high-magnitude strains at high rates. A high-intensity resistance and impact training program (HiRIT) was therefore designed and tested as a potential intervention for postmenopausal women with osteoporosis or osteopenia - the LIFTMOR trial. Despite inherent risk to a fragile skeleton, HiRIT was observed to improve bone without causing fractures in this at-risk population. The purpose of the current work was to determine whether ben- efits from the original LIFTMOR trial were sustained or lost three years post-trial involvement. Methods: Of the 101 postmenopausal women who enrolled in the 8–month LIFTMOR trial, 86 completed and were invited for retesting. Bone mineral density (BMD) at the lumbar spine (LS) and femoral neck (FN)(DXA), and physical performance measures (back extensor strength [BES], lower limb strength [LES], functional reach test [FRT], timed up-and-go test [TUGT], five times sit-to- stand [FTSTS] and maximal vertical jump [VJ]) were remeasured. Participants were designated to four groups based on HiRIT par- ticipation both during and after cessation of the LIFTMOR trial. Participants initially randomised to CON in the LIFTMOR trial who did or did not adopt HiRIT thereafter were designated CON-HIRT and CON-CON, respectively. Those initially randomised to HiRIT who did or did not adopt HiRIT thereafter were designated HiRIT- HiRIT and HiRIT-CON, respectively. Repeated measures ANCOVA was performed to examine between-group differences in change from original follow-up. Results: Fifty women (65 ± 5 years, 161.8 ± 4.0 cm, 61.9 ± 6.1 kg) agreed to participate in follow-up re-testing (3.2 ± 0.6 years). LS BMD improved more in HiRIT-HiRIT (8.63 ± 5.29%, n = 7) than HiRIT-CON (2.18 ± 5.65%, p = 0.042, n = 16). LS BMD improved more in CON-HiRIT (8.54 ± 4.08%, n = 11) than HiRIT-CON (2.18 ± 5.65%, p = 0.046). FN BMD improved more in HiRIT-HiRIT (3.67 ± 4.45%) than HiRIT-CON (2.85 ± 5.79%, p = 0.014). LES improved more in CON-HiRIT (7.1 ± 25.7%) than HiRIT-CON (- 8.8 ± -24.4%, p = 0.012), HiRIT-HiRIT (2.8 ± 22.8%, p = 0.024), and CON-CON (3.1 ± 26.5%, p = 0.022, n = 16). TUG improved more in CON-HiRIT (15.6 ± 7.9%) than HiRIT-HiRIT (1.4 ± 12.3%, p = 0.001), HiRIT-CON (7.8 ± 8.2%, p = 0.021). FTSTS improved more in CON- HiRIT (7.1 ± 12.9%) than HiRIT-CON (-6.4 ± 20.5%, p = 0.018) and CON-CON (3.9 ± 10.9%, p = 0.029). VJ improved more in CON-HiRIT (17.23 ± 11.49%) than CON-CON (-22.95 ± 9.58%, p = 0.020). Conclusion: Although representing only 58% of the original LIFTMOR participants, to the extent that our conclusions are tempered by sample size, our follow-up analyses suggest that mus- culoskeletal and functional benefits from HiRIT may endure for some years. Nevertheless, ongoing participation is likely necessary for meaningful sustained effect. https://doi.org/10.1016/j.jsams.2019.08.205 O44 Adapting the workplace power men’s weight loss program for long-distance truck drivers: physical activity and weight loss outcomes M. Young * , R. Drew, P. Morgan Priority Research Centre for Physical Activity and Nutrition, School of Education, University of Newcastle Introduction: Truck driving is the most common occupation for adult Australian men. However, it is also associated with very low levels of physical activity, musculoskeletal injuries, poor sleep quality, fatigue, and suboptimal nutrition. This combination of risk factors places truck drivers in the highest risk categories for serious health complications including obesity, heart disease, diabetes, and multiple cancers. To address this, the current study investigated whether an existing health intervention for male shift workers (Workplace POWER) could be adapted to improve the weight and physical activity levels of overweight and obese male truck drivers. Methods: This study included 19 male employees from the transport division of a large civil construction organisation in New- castle, NSW (mean (SD) age = 49.5 years (8.4); weight = 108.7 kg (22.8)). Almost all men (95%) lived in areas of low-to-middle socio- economic status. The 3-month Workplace POWER intervention was largely self-directed and included printed materials, online videos, and text messages. A 2 hr information session from the original pro- gram was was delivered over 2 x 1 hr blocks in the current study to accommodate the drivers’ work schedules. Due to low levels of computer literacy, a paper-based system was also developed as an alternative to the MyFitnessPal app/website for diet and exercise monitoring. The program endorsed sustainable behaviour changes and was tailored toward traditional masculine values (e.g., humour, autonomy). Physical activity (Godin Leisure Time Exercise Ques- tionnaire) and weight were measured at baseline and 3 months and participants completed a process evaluation. Paired sample t- tests examined treatment effects and Cohen’s d effect sizes were estimated. Results: All men completed the pre- and post-test assessments. Overall, 89% (n = 17) were not meeting physical activity recommen- dations at baseline and 84% (n = 16) were obese. At post-test, the men’s MVPA had increased by 34 mins/week (95%CI -4, 73, p = 0.08, d = 0.44) and their weight had decreased by 3.4 kg (95%CI 1.3, 5.4, p< 0.01, d = 0.79). The men reported high levels of satisfaction with the program (e.g., 100% would recommend to a friend). Discussion: The effect sizes observed in this study indicate that a low-dose, gender-tailored weight loss program may have poten- tial to improve the health of long-distance truck drivers. However, these findings require replication in a specifically powered trial. If effective, the program may have utility for transport and truck driv- ing organisations who are seeking low cost and effective strategies to improve the health and well-being of their high-risk workforce. https://doi.org/10.1016/j.jsams.2019.08.206