The science of music and sport
Costas Karageorghis, a professor at Brunel University London and the most cited researcher in the world on music and sports performance, has published dozens of studies showing that music with a rhythm synchronized to movement can improve aerobic performance by 10 to 15% and reduce the rating of perceived exertion by up to 12%. The mechanism is twofold: music acts as a distracting stimulus (taking focus away from fatigue) and as a motor synchronizer (the body tends to match its rhythm to the music's BPM).
Karageorghis CI et al., Journal of Sports Sciences, 2011, "The ergogenic and psychological effects of synchronous music during circuit-type exercise"
Types of headphones and their impact on training
In-ear headphones with active noise cancellation (ANC): maximum sound immersion, maximum isolation from the environment. Ideal for gym workouts, the stationary bike or the treadmill. Problematic for road or trail running because it eliminates warning sounds (cars, cyclists, animals).
Bone conduction headphones (e.g. Shokz OpenRun): transmit sound by vibration through the skull bones, leaving the ears completely open. You hear the music and the environment at the same time. It is the safest option for running outdoors.
Open-ear headphones without ANC: a compromise between audio quality and environmental awareness. Good for urban running where you need to hear traffic signals but also want music.
Race regulations and safety
World Athletics has banned wired headphones in official competitions since 2008. Wireless headphones are allowed in non-elite events, but rules vary by organizer. In triathlon races, headphone use is generally prohibited for the entire race for safety reasons in the transition and on the bike course.
When NOT to use headphones
- Technical workouts: running form sessions, cadence work, gait analysis. You need proprioception and the auditory feedback of your own body.
- Trail running: uneven terrain demands full attention. Roots, rocks and surface changes require simultaneous auditory and visual focus.
- Bike on the road: riding on public roads without hearing cars and pedestrians is a real risk, and in several states and municipalities it is a traffic violation.
- Swimming: waterproof headphones for swimming exist, but they are recommended only for the pool, not for open water where warning sounds matter.
Long-term hearing
The WHO estimates that 1.1 billion young people are at risk of hearing loss from exposure to loud music. In long workouts with headphones, the risk accumulates. The 60/60 rule is widely recommended by audiologists: no more than 60% of maximum volume for no more than 60 minutes in a row.
The most cited case in the literature is Haile Gebrselassie's. On February 15, 1998, in the indoor arena in Birmingham, the Ethiopian broke the indoor 2000m world record with 4:52.86 while Scatman by Scatman John played over the loudspeakers at his request. The song has about 130 BPM, well below his running cadence (near 180 to 190 steps per minute), so he ran in a syncopated rhythm, taking about one and a half times more steps than the track's beat. It was no accident: Gebrselassie said the beat was perfect for the movement and used the same song in record attempts.
The physiological explanation came from the studies of Costas Karageorghis at Brunel University. Beyond the endurance gain, the work of Bacon, Myers and Karageorghis (2012) showed that pedaling in sync with the music reduced oxygen consumption from 1.94 to 1.80 liters per minute at the same effort, an economy of about 7%. In other words, the body moves more efficiently when the movement matches the beat. The effect, however, tends to have a ceiling: at very high intensities, the muscle's fatigue signals dominate attention and music almost stops masking the effort.
The meta-analysis by Terry and Karageorghis (2020), published in Psychological Bulletin with 139 studies and 3,599 participants, consolidated the picture: music improves affect (effect 0.48), physical performance (0.31), perceived exertion (0.22) and even oxygen consumption efficiency (0.15). It is worth remembering the regulatory side: USA Track and Field only relaxed headphone use in December 2008, leaving the decision to the director of each non-elite road race, for reasons of safety and communication with the organizers.
What stays
Haile Gebrselassie broke the indoor 2000m world record listening to "Scatman" by Scatman John playing over the loudspeakers in Birmingham in 1998, a song with a BPM well below his own cadence, and it still worked, because Karageorghis's science shows that the body saves up to 7% of oxygen when the movement finds the right rhythm. Headphones in training are not about enjoying a playlist, they are about choosing the right tool for the context: bone conduction on the street, total isolation only on the treadmill, purposeful silence on the trail and in technical work. The question that decides everything is not "what music will I listen to", it is "can I still hear the car, the bike, my own body". Adjust the volume before your ear adjusts it for you.
