Upper body postures
thoracic kyphosis
LORDOSIS
Six two-dimensional gravimetric inclination sensors (PS11; sample rate 8 Hz; resolution 0.1° and 125 ms in time; maximum static error 0.5°) were placed on the forehead, vertebrae T1, T10, L1, and L5, measuring flexion and lateral flexion angles with respect to the absolute perpendicular. The difference in flexion angles was used to calculate cervical lordosis or neck flexion (forehead–T1), thoracic kyphosis (T1–T10), and lumbar lordosis (L1–L5). The difference in lateral flexion angles was used to calculate neck lateral flexion (forehead–T1). The sensor on T10 was used to determine trunk flexion. The average angles during B