Hoogendoorn WE, van Poppel MN, Bongers PM, Koes BW, Bouter LM. Physical load during work and leisure time as risk factors for back pain. Scand J Work Environ Health´1999; 25(5): 387-403.
Fiatarone MA, Marks EC, Ryan ND, Meredith CN, Lipsitz LA, Evans WJ: High-intensity strength training in nonagenarians. Effects on skeletal muscle. JAMA. 1990 Jun 13;263(22):3029-34.
Andersson EA, Grundstrom H, Thorstensson A. Diverging Intramuscular Activity Patterns in Back and Abdominal Muscles During Trunk Rotation. Spine 2002; 27(6):152-160
Leyk D, Rüther T, Wunderlich M, et al.: Physical performance in middle age and old age: good news for our sedentary and aging society. Dtsch Arztebl Int 2010; 107(46): 809–16. DOI: 10.3238/arztebl.2010.0809
