Winter Olympics: The Curious Case of “Skelly Head” in Skeleton Athletes

Standing at the top of the skeleton run at the 2018 Winter Olympics in PyeongChang, the cold was aggressive. It was -27 °C. Cold enough that icicles had formed in my beard as I watched athletes prepare to hurl themselves head-first down an ice chute at motorway speeds – a perfectly normal way to spend a Tuesday morning, obviously.

PyeongChang was my 4th Olympic Games, but my first as Chief Medical Officer for Team GB. You might think three decades in Sports and Exercise Medicine would dull your curiosity, but if anything, experience just refines the questions. As I looked down the run that morning, two things occupied my mind.

First: would Lizzy Yarnold retain her Olympic gold? (Spoiler: She did, magnificently).

Second, and the one that has nagged at me far longer: what truly causes the symptoms skeleton athletes call “Skelly Head” (or “Sled Head” to our North American colleagues)?

The first question was answered on the podium. The second remains one of the more interesting, unresolved puzzles in our field.

A career defined by head injuries

Skelly Head has always fascinated me, and not by accident. My academic background is in concussion. I’ve spent over thirty years as Chief Medical Officer for GB Boxing; a sport where rapid, precise symptom recognition and knowing the difference between structural injury and functional disturbance is critical.

Here is the challenge: Skeleton athletes often present with symptoms that look, on the surface, suspiciously like concussion; headache, dizziness, disorientation, visual disturbance, neck discomfort.

Yet, in most cases, they haven’t hit their head. There is no big impact, no rotational acceleration, and no consistent post-traumatic cognitive profile.

My position is clear: Skelly Head is not concussion, despite the superficial similarities. Conflating the two is like treating a migraine with a neck brace, it risks misunderstanding both conditions.

When the physics hits the physiology

Skeleton is one of those brilliant sports that captures global attention for two weeks every four years, then largely vanishes from view.

But the physiological demands don’t disappear when the TV cameras leave. These athletes are repeatedly exposed to one of the most extreme mechanical environments in sport. Over multiple Olympic cycles, I’ve seen a recognisable pattern emerge: athletes reporting dizziness, visual strain, and stiff necks following runs. Sometimes transient, sometimes cumulative, and often without any identifiable “crash.”

So, what is happening?

It has become increasingly clear that the culprit is repeated, high-frequency vibration transmitted through the sled, the ice, the helmet and right into the cervical spine.

We need to stop viewing this vibration as just an incidental nuisance of the sport. It is an active sensory stressor. It occurs within specific frequency ranges known to bother vestibular organs (our balance system) and the sensors in our neck responsible for spatial orientation.

The “Snow Globe” Effect: A Mechanistic Framework

Rather than a single pathology, I believe Skelly Head is best understood as a transient disturbance of how the brain integrates multiple senses under load.

1. The Vestibular Shake-Up Imagine your inner ear getting shaken like a snow globe. Repeated vibration seems to transiently scramble vestibular signalling-specifically the inputs that sense linear acceleration and head position. The result is subtle reductions in reflex stability and a “visual–vestibular mismatch.” The eyes and ears are telling the brain different things. Crucially, this happens without permanent damage, which explains why standard vestibular tests usually come back looking normal.
2. The Cervical Response The neck is not a passive passenger. Vibration transmitted through the sled–helmet interface modifies signals from the neck to the brain. The body responds with protective stiffness-increasing muscle tone. This stiffness is both adaptive (trying to stabilise the head) and contributory to the problem, leading to secondary headaches and discomfort.
3. Central Processing Overload At a central level, the poor brain has to reconcile noisy signals from the ears, altered input from a stiff neck, and heavily relied-upon visual information, all while moving at 80mph. It’s a massive increase in processing demand.

Symptoms arise not because tissue is broken, but because the integration system becomes inefficient under extreme, repeated load.

Why this matters (beyond the ice track)

Why fuss over a niche condition in a niche sport? Because precision in diagnosis is everything.

Misclassifying Skelly Head as concussion is unhelpful. It risks inappropriate management, unnecessary restriction, and misplaced anxiety about brain injury, while failing to address the true underlying mechanisms.

Athletes deserve explanations grounded in physiology, not just convenient labels. Clinicians need frameworks that recognise functional, load-dependent disturbances rather than forcing symptoms into diagnostic categories that don’t quite fit.

Skelly Head isn’t mystical. It is a predictable physiological response to high-frequency vibration acting on tightly coupled body systems. Standing in that -27 °C freezer in PyeongChang, it was clear to me that getting this right mattered.

In the work we do at the clinic today-applying that same rigorous curiosity to all head symptoms, whether from an Olympic sled or a fall at home, it matters even more.