Rundle, RachelAlanazi, Reem Mohammed2024-10-222024https://hdl.handle.net/20.500.14154/73285Abstract Background: Aging is associated with a progressive decline in skeletal muscle mass and strength, known as sarcopenia. Nutritional factors, particularly protein and vitamin D, may be beneficial in maintaining physical function and mitigating the effects of this condition. Methods: A cross-sectional observational study includes 40 community-dwelling women from South Yorkshire. Finding: The results showed no significant association between protein intake and vitamin D serum with different categories of physical performance (SPP) with scores of 10 < and >10 (P = 0.432) for protein and (P = 0.639) for vitamin D serum. Additionally, there was a weak but not statistically significant difference in vitamin D intake (P = 0.051). Furthermore, no association was found between grip strength and protein groups of 1.2< and >1.2 g/kg (P = 0.701). Nor between grip strength and vitamin D intake (P = 0.200) or serum vitamin D levels (0.528). Conclusion: The present study finds no significant association between protein intake, vitamin D intake, and vitamin D serum level with physical performance (SPPB) and handgrip strength.21enKeywords: protein intakevitamin D intakevitamin D serumphysical performancehand strength.Thesis