Thirty subjects (14 male and 16 female) without any shoulder complaints voluntarily participated in the study [mean age: 24.7 years (SD, 4.7); height, 172.7 cm (SD, 8.2); weight, 63.9 kg (SD, 10.7); body mass index, 21.3 kg/m2 (SD, 2.0)]. All subjects provided informed consent.