AB1403 IS MUSCLE STRENGTH ASSOCIATED WITH SPATIOTEMPORAL GAIT PARAMETERS IN PATIENTS WITH NON-SPECIFIC CHRONIC LOW BACK PAIN? THE BACKFIT PROJECT

Background Non-specific chronic low back pain (NSCLBP) is one of the most common musculoskeletal disorders globally, as approximately 10-40% individuals experience it [1] . Chronic characterized when persists more than 12 weeks, and non-specific causes are unknown origin [2] People with NSCLBP present weakness multifidus, transversus abdominis, internal oblique gluteus maximus muscles difficulties to maintain a coherent walking due lack strength control [3] Objectives To explore association flexor, extensor, lower- upper-body muscle spatiotemporal gait parameters in patients NSCLBP. Methods A total 105 NSCLBP, 69 women (mean ± standard deviation= 50.9±9.9 years) participated this cross-sectional study. Back upper- lower-body were measured reliable valid tests (prone bridging, Biering-Sørensen, hand dynamometry (TKK 5101) 30-second chair-stand test, respectively). Global was calculated normalized index (z-score) procedure from each test. Spatiotemporal (contact time, speed, stride length, cycle/time, double support load respond) obtained an Optogait™ platform, where informed walk comfortably until 150 200 steps registered 5 meters closed circuit. Linear regression analysis used study between parameters. Age, medication for pain, relaxation depression, fat percentage covariates using ‘stepwise’ method. These variables administered via interview, except which 8 tactile polar electrode bioimpedance system (InBody R20). Results In women, greater flexor associated lower contact time (β=-0.328), cycle/time (β=-0.382), (β=-0.313) respond (β=-0.302), higher speed (β=0.341), longer length (β=0.272) (all p ≤0.013). Greater less (β=-0.160) (β=-0.237), (β=0.365) (β=0.415) ≤0.031). (β=0.380) (β=0.476) ≤0.001). global (β=-0.370), (β=-0.468), (β= -0.324) (β=-0.320), (β=0.431) (β=0.491) ≤0.03). men, extensor (β=0.353), (β=-0.387) (β=-0.365) ≤0.038). (β=-0.342) ( =0.044). 0.414), (β=0.410), (β=-0.373) (β=-0.354) ≤0.037). Conclusion Our findings suggest that consistently better females males Future studies might determine whether randomized trial focused on strengthening musculature contribute improve abnormalities References [1]O’Sullivan, P. Manual Therapy, 2005; 10(4): 242–255. [2]McGill, S. Mechanic. (2015). [3]Kim, B., et al The Tohoku Journal Experimental Medicine, 2020; 251(3): 193–20 Acknowledgements authors thank all researcher involved fieldwork. Participants deeply acknowledged their collaboration great enthusiasm during development This supported by Instituto de Salud Carlos III through reserch contract Miguel Servet (CP20/00178) co-funded European Social Fund. Furthermore, BD-P “Margarita Salas” postdoctoral grant UCOR01MS. Disclosure Interests None Declared.