Abstract:
The purposes of this study were to theoretically explain how physical characters of hula hoop affects hula hooping and to explain trunk movement patterns during hula hooping. This research employed empirical study after a mechanical analysis of hula hooping. An empirical study was designed and carried out to support the assumptions based on the mechanical analysis. Circular motion, friction, and Newtons Law of Motion were utilized and found that hula hooping was affected by radius of the movement of hula hoop, and not by its mass. To perform an experiment to test the hypothesis, 20 undergraduate female Chulalongkorn University students between 18-24 years old were purposively selected to participate in the study. The participants were asked to hoop 9 different sizes of hula hoops. The number of participants who could hoop the hula hoops was collected and later analyzed using a Goodness of Fit Test with the significant level of 0.10. Anugular velocity of the hoop and angular velocity of the pelvic and shoulder were analyzed using Two way ANOVA with the significance level of 0.05. In term of Biomechanics, 20 participants were divided into two groups who could hoop or who couldnt hoop ones. Then three dimension movements of trunk were analyzed. The kinematics data has been statistically tested using "T" (Independent t-test) with the significance level of 0.05. The results were as follow: The number of participants who could hoop the 98-cm diameter of hula hoop was greater than those who could hoop the 85-cm and 72-cm diameter hula hoop, respectively. The number of participants who could hoop 1.5-kg, 1-kg, and 0.5-kg hula hoop was equaled.Hoop diameter affect, the angular velocity of hula hoop and of pelvic .The greater the hoop diameter,the faster angular velocity of hula hoop and of pelvic. Moreover, the study found that range of motion of the trunk in 2-plane of participants who could hoop was greater than those who could not. Conclusions: Diameter and mass hula hoop that affect hula hooping skill. However,the movement of trunk that affect hula hooping skill too.