Disziplinanlyse BMX-Race

Roland Meurer

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Abstract

Three different studies were conducted to give an overview of the discipline BMX race. In the first study, physiological performance parameters were detected and recorded during a BMX race season. 12 junior riders (17,5 ± 1,7 years, 169,9 ± 11,6 cm, 61,45 ± 11,4 kg, 17,97 ± 2,3 kg/m2) and 10 elite riders (21,8 ± 2,2 year, 178,4 ± 3,4 cm, 76,25 ± 8,3 kg, 21,32 ± 2,1 kg/m2) took part at this study. A laboratory test and a field test were conducted. The elite riders improved their required time in the field test from T1 to T2 significantly by 0,7 s.At the same time, the elite riders improved the maximum performance significantly by 133,1 W during the field test and significantly by 209,8 W during the laboratory test. The required time of the junior riders improved from T1 to T3 significantly by 1,9 s. The maximum performance during the laboratory test increased significantly by 287,1 W. During the field test the significant increase was 255,1 W. With regard to the mentioned parameters above, the collected data reveal a significant increase during field and laboratory tests of the elite and junior riders throughout a whole season. In the second study, the rolling resistance on different grounds (asphalt and firm sand) was evaluated. Several air pressure were tested on a 400m long track with a gradient of 4 %. For this purpose, a SRM-system has been mounted on a BMX racing bike. A male expert cyclist (33 years old, 77,5 kg, 177cm, 24,7 kg/m2) has carried out the investigation. The test person had to cycle with a constant speed of 15 km/h on the test track. The tyre (Schwalbe Big Apple 20") has been tested with different air pressure from 2,0 bar to 5,5 bar. The air pressure has been increased by 0,5 bar each time. On asphalt, the lowest roll resistance has been measured with 5,5 bar. With regard to the ground sand, the lowest roll resistance values were at 3,0 bar. However, on a BMX track both grounds are not evenly regarding their lengths. By taking this into consideration and placing the values in relation to each other, the roll resistance is at 3,0 bar at its lowest point. The average roll resistance is 18,0 W which corresponds to 9,8% of the entire performance. Thus and before every race, the ideal air pressure has to be checked. In the 3rd study, 100 test persons (25,1 ± 4,75 years, 1,77 ± 0,03 cm, 72,8 ± 4,4 kg, 25,1 ± 4,75 kg/m2) completed a bike specific course. The test persons were divided in 5 different categories according to their focus areas: BMX race riders, mountainbike riders, sports students, athlets with ball game experience and individual sportspersons. The course had to be completed in a defined sequence of eight stations in total. For each station, the test persons got points while riding all the same equipped mountain bike. At the stations Wheelie (7,3 ± 3,3 pt) and Parcours (12,7 ± 2,5 pt) there were significant differences between BMX riders and all other tested groups. In general, the BMX race riders obtained the most points (44,8 pt BMX-race-riders, 29,7 individual sportspersons, 28,6 pt mountain bike riders, 23,7 pt sports students, 20,8 pt athlets with ball game experience). Therefore, BMX race riders should have well-developed skills like flexibility, riding technique, anticipation, balance, rhythm as well reaction skill.
Key words: BMX race, bicycle motocross, performance diagnostics, lactate, watts, rolling resistance, air pressure, technique, obstacle course, driving skills ourse, coordination
Original languageGerman
Place of PublicationKöln
PublisherDeutsche Sporthochschule Köln
Number of pages276
Publication statusPublished - 2018

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