A subject wearing a mask (or not) pedals vigorously in a Bicycle Confinement Laboratory. Researchers inject a harmless fluorescent tracer or salt particles into the rider's exhale to mimic a respiratory virus. The High-Tech Capture: High-speed particle counters (aerodynamic particle sizers) map the "plume" behind the rider. The Shocking Result: Studies in these labs (specifically at the University of Colorado and TU Berlin) found that a cyclist pedaling at 150 watts projects aerosols further than a person coughing while standing still. The turbulent wake of the pedaling legs actually propels viral particles to the 6-foot mark and beyond. This changed WHO guidelines for indoor spin classes during the pandemic.
The proliferation of these specialized laboratories is changing the "ecology" of the city. When cyclists know their equipment—which can often cost as much as a used car—is being kept in a controlled, monitored environment, they are more likely to invest in high-quality bicycles. This creates a positive feedback loop: better bikes lead to longer commutes, which leads to fewer cars on the road, ultimately resulting in lower urban carbon footprints. Conclusion Bicycle Confinement Laboratory