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Purpose: To investigate the relationship between arm swing and ground reaction forces that occur during restricted arm swing during walking. Methods: Twenty-seven healthy volunteers included the study (av. age: 22.59 ± 1.04). For the ground reaction forces (GRF), the Mat-Scan system (Tekscan Inc. Mass. USA) was utilized. GRF was analysed for 3 walking conditions at self selected speed; 1- both arms freely swing (FS), 2- the dominant arm swing was restricted and 3- The dominant arm was held by an arm sling (H). The first and the second peak forces (F1, F2 (kg/cm2), stance times (tstance (sec)) and maximum forces (Fmax (kg/cm2)) of dominant side foot were the interested parameters (3). After the normality test, Spearman rho's was used for the correlation. (p < 0.05) Results: There was very strong corelation between the case of freely swing and restricted arm swing for Fmax (rho: 0,94) F1 (rho: 0,95) and F2 (rho: 0,91) and strong between the case of freely swing and restricted arm swing for tstance (rho: 0,79) (Table 1). Also, very strong corelation between the case of freely swing and held arm swing for Fmax (rho: 0,92) and F1 (rho: 0,93) was found. (p < 0.05) Conclusions: The ground reaction forces and the duration of the stance phase have changed on the restricted side, depending on the state of the arm swing during walking. This may be related to increased plantar flexion momentum and energy expenditure. [ABSTRACT FROM AUTHOR]