Nick Tiller (MRes, Ph.D.) is a researcher in respiratory medicine and exercise physiology at Harbor-UCLA. Nick is a published author, science writer and communicator. He was born in London, England, and now resides in Los Angeles, CA.


Join the FIGHT against PSEUDOSCIENCE in sport!

This informative and accessible volume scrutinizes the plausibility of, and evidence for, the most popular sports products and practices on the market. The Skeptic's Guide to Sports Science is a must-read for exercisers, athletes, academics, students, and practitioners who hope to retain their intellectual integrity in a lucrative health & fitness industry that is spiraling out-of-control.

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Tiller NB, Stewart GM, Illidi CR, Levine BD. (2020). Exercise is medicine? Cardiorespiratory implications of ultra-marathon running. Current Sports Medicine Reports; Ahead of print.

Tiller NB, Campbell IG, Romer LM. (2019). Mechanical-ventilatory responses to peak and ventilation-matched upper- versus lower-body exercise in normal subjects. Experimental Physiology; 104, 920-931.

Tiller NB. (2019). Pulmonary and respiratory muscle function in response to marathon and ultra-marathon running: a review. Sports Medicine; 49, 1031-1041.

Tiller NB, Roberts JD, Beasley L, Chapman S, Pinto JM, et al. (2019). International Society of Sports Nutrition Position Stand: nutritional considerations for single-stage ultra-marathon training and racing. Journal of the International Society of Sports Nutrition; 16(1), 50.

Tiller NB, Campbell IG, Romer LM. (2017). Influence of upper-body exercise on the fatigability of human respiratory muscles. Medicine & Science in Sports & Exercise; 49(7), 1461-1472.

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‘The Skeptic’s Guide to Sports Science’

Scientific Triathlon


Ultra-marathon nutrition for training and racing

The KoopCast


‘Physiological responses to a 24-hour cycling challenge’

Global Cycling Network


The extreme challenges of ultra-marathons

Inside Science


Nutritional considerations for single-stage ultra-marathon training and racing

We Do Science


‘Red Bull: The physiology of an elite climber’

Pioneer Television


‘Nina and the Neurons’

BBC Television



BBC Television


‘Fitness for motor-racing’

Eurosport Television


‘The Human Body’

BBC Television

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The MARATHON DES SABLES is an infamous 155 mile, 7-day, self-sufficient footrace through the Sahara Desert. On day six of this race, we completed a 42 km section in 54 °C (130 °F). At the time, it was the hottest temperature recorded in race history.

It was my first major ultra-marathon, following a string of smaller stage races and a 50-mile trail run. I finished in 230th position of 900, and raised over £5,000 for the Royal Marsden Cancer charity. To this day, it's the greatest experience I've had contesting an ultra-marathon.

The NORTH DOWNS WAY 100 was my second attempt at the illusive 100-mile finish, after my first attempt of the Lakeland 100 was scuppered when my running buddy exclaimed he could no longer see!

This public trail stretches from Farnham in the Surrey hills to Ashford in Kent; it was actually 105 miles in length. It has a moderate cumulative climb of 10,000 feet. Traversing the course in its entirety took me 26 hours, 11,000 calories, and  and around 215,000 steps.

It was hot in 2018, the year I ran, with midday temperatures exceeding 30 °C, and many people fell to the heat.

The IRONMAN Triathlon European Championships. Not exactly an ultra-marathon, but it was my gateway into the sport. I drove from London to Frankfurt, Germany with my bike in the trunk. Race temperature exceeded 30 °C . 

The PINE CHALLENGE was a UK enduroman, comprising as many 5.3-km loops as possible within 6 hours.

I got my food right on this day, and the weather conditions were perfect for running, albeit slightly muddy. I trotted to a 2nd-place finish, much to the chagrin of the race director who, for an unknown reason, didn't much like me.

The RAY MILLER 50 took me from the Yorkshire Peaks to the Santa Monica Mountains. I had a blast navigating this undulating/hilly trail in Southern California. The conditions were perfect and I stormed to a 6th-place finish overall.

The race starts and finishes with a steep 5 mile ascent/descent with stunning views of the ocean. Almost worth falling over for.

The ST. ALBANS STAMPEDE​ was a 12-hour enduroman; lap after lap of the same solitary 4-mile loop. A roller-coaster of emotions throughout, from euphoria to despair. You can run it in groups, as a relay. I did not. It helps if you get your nutrition right; I did not!

The GLENCOE MOUNTAIN ULTRA in the Scottish Highlands was, as you'd expect, a dark and moody affair. I can't recall how much climbing was involved, but 55 km took me over 8 hours. I finished in 3rd place, even after losing my way. The race was "organized" by The Trail Events Co., and I cannot recommend more strongly that you never participate in one of their races. Their organization and safety measures were poor to the point of negligence. These are not qualities that go over well in the isolated and dangerous Highlands.



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For media/press enquiries, please contact Nick via email or social media

nbtiller@hotmail.com    |    Los Angeles, CA