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An Overview of Extreme Sports
Published in Datta Sourya, Debasis Bagchi, Extreme and Rare Sports, 2019
The use of bikes to reach high in the air and then land safely on the ground. The premise of BMX is built on the fact it is a sport where the bicycle, smaller than a mountain/road bike is used to ride on dirt. The bike has 20-inch wheels, good tires for traction on dirt and handlebars with crossbars and rear wheel brakes. BMX has evolved as a sport and could be of the following:Flatland BMX: performed on flat surfaces with no ramps.Street BMX: In urban surroundings, terrain could be creative which could have stairs and handrails.Park: Terrain is man-made and could be done in skate parks or other terrains specifically built for the purpose.Dirt: Mostly done on dirt race tracks.
Neurosurgery
Published in Philip Stather, Helen Cheshire, Cases for Surgical Finals, 2012
A 17-year-old competitive BMX rider is brought to A&E following a fall from his bike. The event doctor describes witnessing hyperextension of the neck. On examination, the rider has an ataxic gait. What is the likely diagnosis? Brown-Sequard syndromeAnterior cord syndromeCentral cord syndromeCauda equina syndromePosterior cord syndrome
An exploration of the roles and experiences of SCI peer mentors using creative non-fiction
Published in Disability and Rehabilitation, 2022
Danielle Alexander, Jeffrey G. Caron, Jacques Comeau, Shane N. Sweet
When I was five years old, I wanted to be an astronaut. It sounds cliché—but I did. I was obsessed with outer space. I was also obsessed with the danger. Flash forward five years. A BMX rider. I remember seeing them on TV and thinking, “Wow—that’s it.” From then on, I decided that was going to be my life. And, in a way, it’s shaped my life more than anything else. Having that accident was single-handedly the worst and best thing that has happened to me. Do I wanna walk again? God yes! I’d love to walk again. But I won’t and I’ve made the best of my life that I can given my limitations. I can truthfully say that I feel that life is different, but it has been incredible to me. I’ve gone back to school; I’ve travelled the world. So, I have done everything I could have imagined, and even more—even if I wasn’t disabled. I think that becoming disabled made me a stronger person. I think I’ve been more successful than if I had never been disabled. So, you know, there are some positive sides to what happened to me with that accident. If you had asked me at five years’ old whether I would want to be a peer mentor? I would have said, “A what!?” I never would have considered it. Or, I probably would have never even heard of it. I also would have never thought I would find my dream job because of my accident. But it is my dream job. I’ve always loved working with people. And then to be able to take my expertise from my education and previous job experiences… I could not think of anything I’d rather be doing in my life. It’s amazing. I love it.
Hip joint dynamics during the BMX gate start: a case study
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2020
D. Princelle, M. Domalain, J. F. Debril, E. Brunet, J. Sastre, T. Monnet
Overall, traditional cycling has been widely studied in comparison to BMX. The BMX standing start has several specificities (e.g., the non-seated position, the downhill slope and rolling movement of the bike), and no information is available on the joint moment and power of the lower limb during the BMX start and in the general standing start action. Yet to date, all kinetic bicycle analysis has been focused on a sagittal plan analysis. Moreover, specific joint-power analysis is complex as there is no consensus on how negative and positive power should be summed in a single joint or regarding the distribution and repartition of power between each joint (van der Kruk et al. 2018). In 3D, the interpretation is even more complex as power is a scalar quantity and it cannot be decomposed into three axes. To help interpreting the 3D joint power in gait analysis, Dumas and Cheze (2008), proposed a new approach that characterizes joint power as driving, stabilising or resisting whether joint moment vector is aligned with joint angular velocity vector or not.
Dynamic analysis of the BMX start: interactions between riders and their bike
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
D. Princelle, T. Monnet, E. Brunet, J. Sastre, M. Domalain
BMX Race is a sprint discipline with a race time between 30 to 40 s and a track of approximately 400 m. Because of the difficulties to overtake an opponent during the race, the start and the first straight line are crucial and have been shown to be directly correlated with rider’s final position (Rylands and Roberts, 2014). The start of the race includes 2.5-3 pedal strokes and race analysis has revealed that riders achieve to be at the end of the bottom ramp at an average speed of 15.2 ± 0.4 m.s−1 within 2.47 ± 0.04 s (Gross et al, 2017). For this reason, the ability to successfully propel the bike forward and reach a high velocity as quick as possible is crucial. Some research already concentrated on the dynamic aspect of the BMX start (Gross et al, 2017). They showed that torque and cadence of the first pedal stroke were more determinant than further down the ramp. Janssen and Cornelissen (2017) reported that track cyclists generate a greater effective force (Fe) in the first push phase than BMX riders. The effective force is the component of the force generated tangentially to the crank that is responsible for bike propulsion. However, pedalling effectiveness remains to be studied as the lateral component of the force, which is supposedly important, could not be measured in their study. The contribution of upper body dynamics to the bike velocity during the start phase is also unknown.