Introduction: When assessing unilateral upper limb function in a closed kinetic chain, the Upper-Quarter Y Test is an objective reporting measure. It assesses shoulder stability and mobility while challenging the components of core muscle endurance. The aim of this article is to present the relationship between the Upper Quarter Y Balance Test and core muscle endurance, shoulder joint range of motion, grip strength, gender, and body mass index in healthy young subjects. Methods: A total of 35 participants (24 females, 11 males) were included. Reach distances were normalised to arm length and expressed as percentages. Correlations between variables were analysed by linear regression using Pearson’s correlation coefficient (r) for normally distributed variables or Spearman's correlation coefficient (ρ) for non-normally distributed variables. Results: A statistically significant correlation was found between the UpperQuarter Y Test and longer time in the plank position (p < 0.002, r = 0,507), lower range of internal rotation and longer medio-lateral (p < 0.034, r = -0,395) and supero-lateral (p < 0.007, r = -0,447) reach in the test, and greater grip strength (p < 0.05, ρ = 0,318). Conclusions: Associations were found between greater core muscle endurance, higher grip strength, lower range of motion of internal rotation and better performance in the Upper-Quarter Y Test.
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