The Physiology of a 269-foot Jump
Friday, August 6th, 2010On New Years Eve 2009, Travis Pastrana found himself sitting in a rally car, mentally preparing to jump 269 feet across a body of water to break the world record for longest rally car jump. His instructions were clear: begin on the Pine Street Pier in Long Beach, California, take off on a ramp, fly approximately 50 feet above the water, and successfully land on a floating barge about 300 feet away. In the event of failure, he had a scuba tank, as well as rescue crews on the water.
CleveMed had the opportunity to use the BioRadio and BioCapture software to collect physiological data, as well as the car’s acceleration relative to free-fall, during Pastrana’s practice runs. Electrocardiogram (ECG) electrodes and a respiratory effort belt were attached to Pastrana, and the BioRadio was set up to measure G-forces in the car and characteristics such as heart rate and breathing rate were derived. The BioRadio monitored Pastrana’s entire jump, and physiological data collected provided fascinating information about the physiological response Pastrana experienced related to performing such a dangerous and adrenaline-filled stunt.
So, here’s the physiology of Travis Pastrana’s 269-foot jump:
As Pastrana sat waiting to accelerate forward his heart rate was elevated at approximately 107 beats per minute (bpm). His breathing patterns were relatively normal at this time, but his respiratory rate was also elevated.
As Pastrana began his approach, heart rate increased to 110 bpm. Additionally, right as he began to accelerate he took a very deep breath. After this initial breath Pastrana’s breathing was very shallow and rapid.
Upon reaching the end of the ramp where the rally car began its flight, Pastrana’s heart rate was 122 bpm. In addition, at the moment the car reached the edge of the ramp, Pastrana held his breath, and continued to hold it the entire time in the air. During this mid-air flight, Pastrana’s heart rate was approximately 130 bpm.
When the rally car landed on the opposite ramp, Pastrana exhaled deeply, and was quickly followed by a deep inhale and gradually slower respiration rates. In addition, when his rally car made impact with the ramp, Pastrana’s heart rate was 138 beats per minute. Once the car began decelerating, his heart rate gradually decreased until reaching the average normal resting heart rate. This physiological data is significant because it provides insight into the body’s reaction to extreme stress.
But other explanations for Pastrana’s physiological response could be attributed to the physical forces he experienced during his rally car’s flight. It was seen that as Pastrana began accelerating, his car was under approximately 1G of force, and at take-off it was as high as 5G’s. You can read about it here, from “The Physiology of a 269-foot Jump” as seen in BioRadio Research & Education Quarterly, Summer 2010. You can also see a screen-shot of Pastrana’s physiological data collected by BioRadio here!
In conclusion, BioRadio provided a clear image of the physiological response of an extreme sportsman. Even though Pastrana has been performing dangerous stunts for over a decade, it is evident that he still experiences stress and probably excitement during his jaw dropping stunts!
