Regina Guthold, Gretchen A Stevens: Global trends in insufficient physical activity among adolescents: a pooled analysis of 298 population-based surveys with 1.6 million participants, The Lancet Child & Adolescent Health, Volume 4, Issue 1, January 2020, Pages 23-35 DOI 10.1016/S2352-4642(19)30323-2
R.Blickhan : The spring-mass model for running and hopping, j. Biomechanics Vol. 22, No. 11/12. pp. 1217-1227. 1989 DOI 10.1016/0021-9290(89)90224-8
Mero, A., Komi, P.V. & Gregor, R.J.: Biomechanics of Sprint Running. Sports Medicine 13, 376-392 (1992). DOI 10.2165/00007256-199213060-00002
Tom FNovacheck: The biomechanics of running, Gait & Posture Volume 7, Issue 1, January 1998, Pages 77-95 DOI 10.1016/S0966-6362(97)00038-6
Claire T. Farley and Octavia Gonzalez: Leg stiffness and stride frequency in human running, J. Biomechanics, Vol. 29. No. 2. pp. 181-186, 1996 DOI 10.1016/0021-9290(95)00029-1