Bainbridge's findings contradicted "Marey's Law", a law that stated that an increase in blood pressure caused a lowering of the heart rate. Marey's Law was devised in 1861 by French physiologist Étienne-Jules Marey (1830–1904).
Bainbridge's research contradicted the theory proposed by Marey, which held that elevated blood pressure leads to reduced heartbeats. This theory was developed by French physiologist Étienne-Jules Marey in 1861.