Mosole, S.; Carraro, U.; Kern, H.; Loefler, S.; Zampieri, S. Use It or Lose It: Tonic Activity of Slow Motoneurons Promotes Their Survival and Preferentially Increases Slow Fiber-Type Groupings in Muscles of Old Lifelong Recreational Sportsmen. Eur J Transl Myol 2016, 26.