Dynamic balance ability test
BBS
The Biodex Balance System (BBS) was used to test the Limits of Stability (LOS) and Single Leg Stability Test (SLST) of the athletes to evaluate the dynamic balance of the subjects. All subjects tested the number of groups, content, time, difficulty and posture to maintain the same, the whole process in accordance with the Biodex Balance System (BBS) operating system instructions, 1 person to explain and supervise, 1 person to record. All subjects completed the limits of stability (LOS) test of body movement and control of random target movement in an unsupported state, and the test was averaged three times, with 10 s for each measurement and 10 s for each interval, including the random target movement of overall direction control (ODC), limits of stability time (LOS-T), forward direction control (FDC), backward direction control (BDC), left direction control (LDC), right direction control (RDC), forward left direction control (FLDC), forward right direction control (FRDC), backward left direction control (BLDC), backward right direction control (BRDC), a total of eight indicators of body control ability test, the higher the value indicates the better control ability. All subjects completed the single leg stability test (SLST) with one leg supported on a non-fixed balance board, controlling the body center of gravity near the center of the cross coordinates in the display for 10 s, with 10 s interval each time, and averaged three times, including the overall stability index (OSI), the anterior–posterior stability index (APSI), and the medial and lateral stability index (MLSI) indicators, the smaller the value indicates better stability. We believe that the pre-test results during the Single Leg Stability Test (SLST) can reflect the existence of dominant and non-dominant foot, and if the stability of one foot on the ipsilateral side of the club hand is significantly higher than that on the opposite side, then the ipsilateral foot of the club hand is considered the dominant foot.