1. Position Stand. The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults.;Med Sci Sports Exerc,1998
2. Oxygen cost of running in trained and untrained men and women.;Bransford;Med Sci Sports Exerc,1977
3. The rating of perceived exertion scale.;Borg;Med Sci Sports Exerc,1982
4. Mechanical work in running.;Cavagna;J Appl Physiol,1964
5. Field testing of physiological responses associated with Nordic walking.;Church;Res Q Exerc Sport,2002