TELEMARK: PRESSURE AND MOVEMENT DURING A DOWNHILL
Keywords: kinematography-pressure analysis-pure-testing
AbstractINTRODUCTION: The goal of this study was to control the pressure inside ski boots together with body movement during descents in Telemark. Recording the pressures inside the ski boots and the images of the actions makes it possible to obtain objective results to compare different analyses and different skiers. METHODS: As instruments we used the system DINATTO by BURATTO and ski boots GARMONT mod. Gara. The DINATTO system is composed of two insoles matrix, 64 sensors FRS each with a thickness of 1 mm, connected by shielded cables with 8 conductors with connectors IP65 to a datalogger attached to the athlete’s trouser belt. The datalogger works with a frequency from 25 to 250 Hz and has a radio module modem. It has a display of 8 x 20 rows and a keyboard. The energy source was a 3V battery. The DINATTO system also provides a synchronization signal for the camera. A SONY Camera DVCAM was used with a shutter set at 1000“. The test took place on the VAL SENALES glacier in Italy at an altitude of 3258 m., with an external temperature of –11°C , humidity of 69% and wind at 16mt/s RESULTS: Three Telemark descents were considered: the first of 10.1 sec., the second of 55.9 sec. and the third of 62.7 seconds. In all three descents we set a frequency of 100 Hz and synchronized the video images with the pressures obtained. CONCLUSIONS: From the test we found that the main pressure is present in the back foot area. During the phase of kneeling the foot is in supination to block the knee and to give more stability. At the same time, the advanced foot makes a fulcrum in the ski fastening and considerably loads the back foot area. REFERENCES: In order to achieve these results we started from a technology applied during the PARIS Marathon 96 and VENICE Marathon 96 and 97.
Equipment / Instrumentation
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