Muscle CSA, force production, and activation of leg extensors during isometric and dynamic actions in middle-aged and elderly men and women - Häkkinen, K; Alen, M; Kallinen, M; Izquierdo, M; Jokelainen, K; Lassila, H; Mälkiä, E; Kraemer, W J; Newton, R U (J Aging Phys Act, 1998)