Barcelona was one of the first cities to introduce the scheme, in 2007, and has more than 180,000 regular users. In London there are 128,000 registered users of the scheme, who on average cycle for 16 minutes per week-day journey.
The main motivations are speed, exercise and saving money, according to research by Nicolina van der Merwe at the Environmental Change Institute, University of Oxford. Her research suggests people have taken up cycling in London in place of the Tube and bus, rather than cars.
The Barcelona study is the first to demonstrate the positive health benefits to individuals as the result of a cycling scheme.
It adds support to a 2009 Lancet analysis which found the potential for public-health benefits if more people walked and cycled to get around cities instead of driving.
Dr James Woodcock, from the UKCRC Centre for Diet and Activity Research, who conducted the Lancet study, said: "People should be encouraged to get out of cabs and cars."
- Independent