The green prescription study: a randomized controlled trial of written exercise advice provided by general practitioners

Am J Public Health. 1998 Feb;88(2):288-91. doi: 10.2105/ajph.88.2.288.


Objectives: The purpose of this study was to determine whether written advice from general practitioners increases physical activity among sedentary people more than verbal advice alone.

Methods: Sedentary patients (n = 456) received verbal advice on increasing physical activity and were then randomized to an exercise prescription (green prescription) group or a verbal advice group.

Results: The number of people engaging in any recreational physical activity at 6 weeks increased substantially, but significantly more so in the green prescription group. Also, more participants in the green prescription group increased their activity over the period.

Conclusions: A written goal-oriented exercise prescription, in addition to verbal advice, is a useful tool for general practitioners in motivating their parents to increase physical activity.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Exercise*
  • Family Practice*
  • Female
  • Health Promotion
  • Humans
  • Male
  • Middle Aged
  • Statistics, Nonparametric