They are not. Helmets keep the skull from cracking. Concussions occur when the brain moves inside the skull; helmets do nothing to prevent the brain from rattling within the skull. Helmets are a part of the issue, not a solution.
"The scientific community generally believes that helmets are beneficial in reducing skull fractures and severe brain injuries," says International Concussion Society President Dr. John Leddy. It's important for athletes to understand that helmets reduce the risk of concussion by preventing direct hits to the head.
Here are some of the reasons why people wear helmets when bicycling, skiing, or participating in other sports that might result in head injuries: Helmets can help protect your head from traumas like as cuts and skull fractures. They also may prevent brain trauma caused by objects being thrown at it.
Sports helmets have come a long way since they were first introduced into major sports. Today's models are much more effective in preventing injuries than their early predecessors. However, not all types of sports helmets are created equal. Some helmets may work better than others in reducing the impact of specific types of injuries. For example, a hard hat used in construction sites is not recommended for skateboarders because it does not provide adequate protection against skull fractures.
The best type of helmet to wear depends on how you plan to use it and what kind of sport you are playing. If you are planning to participate in contact sports like football or hockey, it makes sense to buy a helmet designed for those activities. Otherwise you could end up suffering from repeated head injuries which could lead to cognitive problems later in life. In addition, if you are going to be cycling or skiing down hills, a protective helmet is recommended. Finally, if you are just learning how to skateboard and do not want to get injured, it makes sense to start with a less aggressive model and work your way up until you find one that fits properly.
Except for non-tackle varieties such as flag football, helmets are required at all levels of organized football. Despite their protection, players can and do sustain brain injuries such as concussions. Headgear helps to prevent or reduce the severity of these injuries.
AFL players don't use helmets because the league doesn't have the same safety standards as other sports. However, several high-profile cases have prompted some clubs to change their policies regarding equipment this season. Currently, every player on an AFL team must be wearing a mouthguard.
The NFL requires its players to wear helmets that meet or exceed a certain level of protective capability. The only exception is when a player chooses not to wear one. Many high-profile cases of former players suffering long-term effects of brain trauma have caused many teams to force their players to wear helmets.
College football players aren't required to wear helmets but most do so anyway. If they don't, they may be asked to leave the game. Some schools may require their players to wear mouthguards too.
In rugby, players wear headgear made up of a plastic shell with straps that go over the ears and hold it in place.
In addition to preventing injury, headgear also has religious purposes.
Hard helmets provide adequate protection against translational motions and the impact injuries they induce, considerably lowering the risk of skull fractures and internal bleeding (intracranial bleeding). Helmets are primarily intended to disperse force. They should be as close-fitting as possible without restricting head movement.
The hardness of a helmet is usually determined by its density. The higher the density, the harder the helmet. Most modern NFL helmets are made of foam plastic with stiffening wires inside placed in different configurations to provide different levels of hardness. Youth and high school football helmets are often made of synthetic materials such as polycarbonate or modified polystyrene that are similar to those used in automobile windshields. These helmets are generally less dense than their adult counterparts and thus less hard.
As far as design goes, there are three main types of football helmets: full, open-face, and closed-face.
Full helmets cover the entire head and face except for the eye holes. They offer the best protection because all parts of the brain are exposed to forces while playing football.
Open-face helmets have one large opening in front of their face masks to allow for breathing. They tend to be lighter and more flexible than full helmets but may not provide as much protection because some parts of the brain are still hidden from view.