Kinematic analysis of dance-based exergaming: effect of song pace on center of mass and joint mobility.

[Purpose] To establish a quantitative kinematic assessment method for examining postural stability and physical mobility during dance-based exergaming. [Participants and Methods] Fifteen young adults participated in one session of dance-based exergaming assessment using segments from Kinect 'Just Dance 3' consisting of slow-, medium-, and fast-paced songs. A motion capture system was used to record full body kinematics, and a customized MATLAB code was used to compute the variables of interest, such as center of mass sway area, excursion, and peaks, as well as step count and joint excursions. [Results] Total center of mass sway area and excursion were significantly greater for slow-paced (total sway area=1,077.6 ± 209.9 cm; total excursion=629.8 ± 380.5 cm) and fast-paced (total sway area=314.1 ± 133.6 cm; total excursion=478.5 ± 149.0 cm) songs than for the medium-paced song (total sway area=212.9 ± 346.0 cm; total excursion=311.2 ± 119.5 cm). Joint excursion was greater for the knee (ranging from: (slow to fast-paced songs: 55.5°-83.1°) and hip (slow to fast-paced: 40.6°-50.4°) than for the ankle (slow to fast-paced: 32.2°-46.7°) for all three dance paces. Additionally, step count was significantly, positively correlated with song pace (r=0.52). [Conclusion] The current study was able to quantify and provide normative values for postural control and joint mobility among healthy young adults during dance-based exergaming with 3 hip-hop songs of different paces from the Microsoft Kinect 'Just Dance 3'. The results indicated that different paces (intensities) of dance songs corresponded to distinct movement kinematic trends, particularly with slow-paced song having the maximum center of mass excursion and lowest joint excursion, while fast-paced song exhibits the reverse, along with medium-paced song exhibiting the highest hip and ankle joint angle excursions, while the fast-paced song had increased knee joint angle excursions.