Zampieri, Sandra, et al. “Physical Exercise in Aging: Nine Weeks of Leg Press or Electrical Stimulation Training in 70 Years Old Sedentary Elderly People”. European Journal of Translational Myology, vol. 25, no. 4, Aug. 2015, pp. 237-42, https://doi.org/10.4081/ejtm.2015.5374.