de Vries, A W, Willaert, J, Jonkers, I, van Dieën, J H & Verschueren, S M P 2020, ' Virtual Reality Balance Games Provide Little Muscular Challenge to Prevent Muscle Weakness in Healthy Older Adults ', Games for Health Journal, vol. 9, no. 3, pp. 227-236 . https://doi.org/10.1089/g4h.2019.0036 Games for Health Journal, 9(3), 227-236. Mary Ann Liebert