大学スポーツ選手におけるスポーツ外傷・障害の現状と対策 ― 第４報 ―

The purpose of this study was to investigate the occurrence of injuries in collegiate athletes. Subjects were 2122college students. The following results were obtained. 1. Most injuries occurred in senior (38.5%). 2. Many injuries occurred during exercise in March and April, followed by August and December. 3. When injuries were classified by body region, ankle accounted for the largest percentage (23.8%), followed by knee (14.0%) and shoulder (12.8%). 4. When injuries were classified by diagnosis, accounted for the ligaments largest percentage (18.3%), followed by rupture of sprain (16.8%) and fracture of bones (10.8%). 　Based on the results of this study, we need to educate coaches and athletes to evaluate the effective strategies to minimize the risk of injuries

Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector