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Several studies have revealed that approximately three-quarters of injuries occurred when multiple people were using the trampoline at the same time.11–13 The smallest participants were up to 14 times more likely to sustain injury relative to their heavier playmates.14 Heavier users create more recoil of the mat and springs and greater upward impaction forces than smaller users can generate on their own. These forces must be absorbed by the falling body and can be larger than landing on solid ground.15 The risk associated with weight differences in the participants, in combination with less developed motor skills, likely contributes to the increased risk of fractures and dislocations in younger children.
Netting and other perimeter enclosures to prevent falls from the trampoline were first commercially available in 1997, and the American Society for Testing and Materials produced a safety standard for enclosures in 2003. There is a paucity of literature on the effects of netting and other safety measures on injury risk. However, current evidence suggests that the availability of enclosures on the market has not significantly affected the proportions of injuries attributable to falls off the trampoline,10 and there does not appear to be an inverse correlation between presence of safety equipment and rates of injury.8 Proposed reasons for lack of efficacy of safety enclosures include positioning of enclosures on the outside of the frame8 and inappropriate installation and maintenance.10 Children are often tempted to climb or grasp the netting, which may be an additional source of injury.
Trampoline Jump Mat: The trampoline mat may have holes in it caused by things falling on it like branches or fireworks (a common culprit!) or even a cigarette end. The trampoline mat (or jump mat as it is sometimes known) can be replaced. You will need to know the size of your trampoline, the shape of it and the number of springs it has to attach to. You may also need a spring tool to remove the old trampoline mat and install the new one. It can be hard work to do this without a spring tool. Make sure that any new trampoline mat is made of A grade Permatron Polypropylene, which is UV resistant, and sewn with UV resistant thread. The V rings to attach to the springs should also be galvanised to prevent rust.
There are some rebounders which are designed to bounce a lot and some which don't. If you want to use a rebounder to boost your lymphatic system, it is important that you get one with plenty of bounce so that you can generate plenty of gravitational forces. If you solely want it for cardio, the level of bounce will have little effect on how high your heart rate goes up if you stay on the rebounder long enough.
To make things worse, trampoline injuries tend to be more severe than injuries caused by other notably dangerous activities. When the Canadian Hospitals Injury Reporting and Prevention Program compared the proportion of injuries caused by various activities that resulted in hospital admission, they found that trampolining ranked second only after downhill skiing: 12.4 percent of trampoline injuries led to hospital admissions compared with 12.9 percent of skiing injuries. Among the activities that were ranked as less dangerous in this regard than trampolining: snowboarding, bicycling, sledding, skateboarding, ice hockey, and football. (In fact, football injuries were four times less likely to lead to hospitalization as trampoline injuries.) Jennifer Weiss, a pediatric orthopedic surgeon based in Los Angeles and a spokesperson for the American Academy of Orthopedic Surgeons, put it to me this way: "Trampoline injuries are one of the most common reasons that we see people in our orthopedic clinic." If you're wondering whether trampolines have gotten safer since you were a kid, the answer unfortunately seems to be no. Although trampoline standards were tightened in the '90s, leading to more widespread use of spring and frame safety pads as well as boundary nets, a 2010 study found that these changes hadn't led to fewer injuries and concluded that "whatever has been done is not yet working."
Canadian Hospitals Injury Reporting and Prevention Program. CHIRPP Injury Report. Injuries Associated With Backyard Trampolines: 1999–2003 (full) and 2004–2006 Update (Limited), All Ages. Ottawa, Ontario, Canada: Health Surveillance and Epidemiology Division, Public Health Agency of Canada; 2006. Available at: www.phac-aspc.gc.ca/injury-bles/chirpp/injrep-rapbles/pdf/trampolines-eng.pdf. Accessed January 3, 2012
Pediatricians should counsel their patients and families against recreational trampoline use and explain that current data indicate safety measures have not significantly reduced injury rates and that catastrophic injuries do occur. For families who persist in home trampoline use despite this recommendation, pediatricians should advise parents and their children on the following guidelines until better information becomes available:
Encourage them to bounce in the centre of the trampoline and keep other children back away from the trampoline. Never let them go underneath a trampoline.
Doctors tell people not to smoke and only to drink in moderation—that doesn't mean people don't do those things. Life involves inevitable risk, and no one is saying you shouldn't ever bounce. They're saying, "bounce your heart out! Just remember that this is kind of dangerous and you should treat it as a risky activity." They're also definitely saying not to let toddlers on there. And that if you go to a trampoline park, remember that there are zero regulations for running them, and that the 20-year-old who signed you in cannot and will not protect you from harm. Trampoline jumping poses a high risk of injury for children