Cycling is enjoyed by millions of people worldwide, from recreational riders and commuters to elite athletes competing at the highest levels of sport. Whether on roads, trails, tracks, gravel courses, or circuits, cycling offers significant physical and mental health benefits. However, it also carries a risk of head injury.
Concussions are among the most common serious injuries in cycling, particularly following crashes. At the same time, researchers are increasingly interested in the potential role of sub-concussive events-head impacts, accelerations and decelerations that do not produce immediate symptoms but may contribute to cumulative brain stress, physical brain load, over time.
As our understanding of sports-related brain injuries continues to evolve, cycling presents a unique opportunity to study both acute head trauma and long-term exposure to repetitive head movement across a wide range of disciplines.
Understanding Concussions in Cycling
A concussion is a mild traumatic brain injury (mTBI) caused by biomechanical forces acting on the brain. These forces can occur when a rider experiences a direct or indirect impact to the head or when sudden acceleration and deceleration cause the brain to move rapidly within the skull.
Common concussion symptoms include:
Headache
Dizziness
Confusion
Memory difficulties
Balance problems
Nausea
Sensitivity to light or noise
Difficulty concentrating
Importantly, loss of consciousness is not required for a concussion diagnosis. Many cyclists who sustain concussions remain awake and may initially underestimate the severity of their injury.
How Concussions Occur in Cycling
Unlike contact sports where player collisions are common, most cycling concussions result from crashes. Common injury mechanisms include:
Falling from the bicycle
Impact with the road or trail surface
Collisions with obstacles
Rider-to-rider crashes
Collisions with vehicles
Over-the-handlebar accidents
Failed jumps or technical maneuvers
The risk varies across disciplines.
Road Cycling
Road cyclists often travel at speeds exceeding 50 km/h (30 mph) during races and descents. Large group riding can lead to multi-rider crashes where athletes have little opportunity to avoid impact.
Mountain Biking
Mountain bikers face technical terrain, obstacles, jumps, roots, rocks, and steep descents that can increase crash and fall risk.
BMX and Freestyle Cycling
BMX athletes frequently perform jumps, tricks, and aerial maneuvers, creating the potential for high-energy falls.
Cyclocross and Gravel Racing
Uneven surfaces, changing conditions, and technical sections can lead to sudden loss of control and crashes and falls.
Track Cycling
Although racing occurs in a controlled environment, the high speeds and close proximity of riders can result in significant impacts and events when accidents, cashes or falls occur.
The Importance of Rotational Forces
Modern concussion research has shown that rotational acceleration plays a critical role in brain injury. When the head rotates rapidly following a crash, fall or any other incident, the brain experiences twisting and shearing forces that can stretch nerve fibers and disrupt normal neurological function.
In cycling, rotational forces frequently occur when:
A rider falls sideways
The helmet or head strikes the ground at an angle
The body continues moving after impact
Multiple impacts occur during a crash sequence
Many experts believe these rotational forces may be among the most important factors influencing concussion severity. __________________________________________________________________
What Are Sub-Concussive Events?
A sub-concussive event is a head impact, event, acceleration or deceleration that does not cause recognizable concussion symptoms and therefore does not result in a clinical diagnosis. The athlete feels normal and continues riding without any obvious signs of injury. Examples of potential sub-concussive exposure in cycling include:
Minor crashes without symptoms
Low-speed falls
Repeated head acceleration over rough terrain
Impacts transmitted through technical trail riding
Frequent vibration during long rides
Small impacts that occur during training or racing
While each event may seem insignificant on its own, researchers are increasingly interested in the cumulative effects of repeated exposure over months, years, and entire athletic careers.
Why Cycling Presents Unique Questions About Sub-Concussive Exposure
Unlike many contact sports, cyclists may spend hundreds of hours each year exposed to repetitive motion and vibration. Mountain bikers, gravel cyclists, cyclocross riders, and BMX athletes often encounter:
Rough terrain
Repeated impacts
Continuous vibration
Sudden directional changes
Landing forces after jumps
These forces may generate indirect impacts and events with measurable head accelerations and decelerations, even in the absence of an impact, crash or fall. Researchers are now exploring questions such as:
How much head acceleration and deceleration occurs during normal riding?
Do different cycling disciplines create different exposure profiles?
How do cumulative exposures change over a season?
Can repeated low-level accelerations influence brain health over time?
Although many of these questions remain unanswered, they represent an important frontier in sports science research.
Measuring What We Cannot See: Head Impact Monitoring in Cycling
One of the challenges in understanding brain injury risk is that many potentially important head movement events are invisible, not clearly visible, and may occur without obvious immediate symptoms, or no symptoms at all. To better quantify individual impacts and events, cumulative exposure, impact and event exposure patterns, researchers and athletes and organisations in sports increasingly use wearable sensor technologies that can measure head motion during real-world riding events and conditions. Modern head impact monitoring systems can track:
Linear acceleration (g-forces)
Rotational acceleration
Angular velocity
Impact and event frequency and proximity
Cumulative exposure over time
One example is the ACT Head Impact Tracker Head Sensor Pro. The sensor is designed to measure both linear and rotational head movements and can be used during training and competition. By collecting objective data from riders, the system can provide valuable insights into real-life events occurring, impact exposure patterns during crashes and routine riding activities, and keep track of cumulated exposure, the physical brain load the athletes are exposed to.
Importantly, head impact monitoring devices are measuring devices. They are not concussion diagnostic tools, nor are they any kind of medical devices. Concussions require evaluation by qualified healthcare professionals. However, objective measurement systems can support research efforts and sports safety initiatives and efforts by contributing to awareness and deeper understanding of individual events occurring, cumulative exposure and patterns, how cyclists experience head acceleration and deceleration in real-world settings.
The Role of Helmets
Helmets remain one of the most important safety innovations in cycling. Modern helmets are designed to reduce the forces transmitted to the head during direct impacts, and can lower the risk of severe head injury in case of direct impacts.
While helmets cannot prevent the concussions from happening, they remain an essential component of rider safety and injury prevention.
Long-Term Brain Health and Repetitive Head Trauma
Researchers continue to investigate how cumulative exposure to head impacts, indirect impacts and events influences long-term neurological health. Current studies are examining the relationship between repetitive head trauma and potential cognitive, emotional, and neurological outcomes later in life. While much of the existing evidence comes from contact sports, scientists are increasingly exploring how these concepts may apply to endurance and action sports, including cycling.
Understanding lifetime exposure may become an important component of future athlete health monitoring programs.
Improving Safety in Cycling
Several strategies can help reduce concussion risk and improve rider safety:
Helmet Use
Properly fitted and certified helmets should always be worn during training and competition.
Education
Cyclists, coaches, and parents should understand concussion symptoms and the importance of reporting injuries.
Concussion and Return to Sport Protocols
Athletes suspected of having a concussion should stop riding and seek appropriate medical evaluation. Returning to sport should follow gradually, step by step whilst remaining symptom free each step before moving to next.
Skill Development
Improving bike-handling skills, falling and riding technique can help reduce crash and injury risk.
Head Impact Monitoring
Wearable sensor technologies may help athletes, families, coaches, researchers and sports organizations get more information and better understand on real-life events taking place, cumulative exposure and patterns, physical brain load, and support evidence-based safety initiatives.
Looking Ahead
The future of concussion prevention in cycling will likely involve a combination of improved helmet technology, enhanced athlete education, better medical protocols, and more sophisticated monitoring systems.
As researchers continue to investigate both concussions and sub-concussive exposure, objective measurement tools may provide new insights into how different cycling disciplines influence head-impact risk and cumulative exposure throughout an athlete’s career.
Conclusion
Concussions in cycling most commonly occur during crashes that cause rapid head movement and movement of the brain within the skull. However, growing scientific attention is also focused on sub-concussive events and repetitive head accelerations and decelerations that may occur during both crashes and routine riding. Through continued research, improved safety practices, and advances in head impact monitoring technology, the cycling community can gain a deeper understanding of both acute injuries and cumulative exposure, helping to create safer environments for riders across all disciplines.
ACT Head Impact Tracker is a measurement device. ACT Head Impact Tracker is not a medical device. It does not provide medical advice, diagnostics, or treatment suggestions. In case of suspected head injury, immediately and safely remove the athlete from activity and seek assessment from a licensed medical professional.
For more information, or to buy your sensor, visit