HEAD ACCELERATIONS OF SIX TYPICAL JUDO THROWS AND BREAK FALL TECHNIQUES
The contact sport of judo involves throwing an opponent in a variety of ways, with potential risk of concussive head impacts. When being thrown, a judo practitioner executes a break fall, theoretically protecting the head from injury. However, little research has directly measured head accelerations of a person executing a break fall in response to various throws in judo. PURPOSE: Quantify and compare head accelerations associated with six standard judo throws and corresponding break falls. METHODS: In random and repeated design, 14 judo martial artists (13 male, 1 female; age = 28 ± 9 yrs; stature = 177 ± 6.7 cm; mass = 80.3 ± 9.4 kg; rank = brown or black belt) performed five sets of six standard judo throws & corresponding break falls. The six throws were layback throw (tomoe-nage), hand throw (tai-otoshi), leg sweep (harai-tsuri-komi-ashi), shoulder throw (seoi-nage), forward leg sweep (deashi-braai), and thigh throw (uchi-mata). The participant being thrown wore a headband-mounted tri-axial accelerometer, measuring linear (g) and rotational accelerations (krad•s-2) of the head when performing a break fall corresponding with one of the six throws. Minimum threshold for registering acceleration was 16 g. RESULTS: Repeated measures one-way ANOVA and post hoc compared magnitude and frequency of accelerations of the head when performing a break fall corresponding with each of the six throws. When utilizing the linear acceleration criterion >80 g for risk of concussion, as suggested by some experts, none of the six judo throw/break fall combinations resulted in a significant head impact (incidence rate = 0%). However, when comparing all registered accelerations above 16 g threshold, hand throw (1 impact, 1.4 % incidence rate, 27.94 g, 2.8 krad•s-2), forward leg sweep (1 impact, 1.4 % incidence rate, 20.58 g, 1.59 krad•s-2), and thigh throw (7 impacts, 10% incidence rate, 28.16 ± 4.92 g, 3.94 ± 1.83 krad•s-2) had higher frequency of occurrence and magnitude of acceleration than other throws (p<0.01). Thigh throw had highest incidence rate of any throw (p< 0.01). CONCLUSION: The judo thigh throw (and break fall) had the highest incidence of sub-concussive head accelerations in the category of 20-40 g. However, none of the judo throws and associated break falls resulted in any impact considered high risk for concussion.
Florentin, T. and Henry, S. O.
"HEAD ACCELERATIONS OF SIX TYPICAL JUDO THROWS AND BREAK FALL TECHNIQUES,"
International Journal of Exercise Science: Conference Proceedings: Vol. 8
, Article 25.
Available at: http://digitalcommons.wku.edu/ijesab/vol8/iss5/25
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