caa a22 4500 469054638 CHVBK 20180323132840.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00243501 doi (NATIONALLICENCE)springer-10.1007/BF00243501 Response of the trunk muscles to training assessed by magnetic resonance imaging and muscle strength [Elektronische Daten] [R. Parkkola, U. Kujala, U. Rytökoski] Summary: A group of 12 sedentary medical students (1 man and 11 women aged 21-27 years) participated in a strength training programme for the trunk muscles lasting 18 weeks. The maximal isometric flexion and extension forces of the trunk muscles were measured before the training and at 18 weeks by dynamometer. The cross-sectional area of the back muscles, i.e. erector spinae, multifidus and psoas muscles, was measured from magnetic resonance images (spin echo sequence TR/TE 1500/80, slice thickness 10 mm) obtained at the L4-L5 disc level before the training, at 11 and 18 weeks. During training, no significant change in the body mass or body fat content was found. Muscle forces or muscle cross-sectional area were not related to body mass. There was a significant increase in both trunk muscle cross-sectional area (psoas muscle P<0.001 and back muscles P<0.01) and trunk muscle forces (flexion and extension forces P<0.01) during the training but no direct association between the muscle cross-sectional area and strength of the flexors and extensors was detected before or after the training. Springer-Verlag, 1992 Muscle strength nationallicence Trunk muscles nationallicence Magnetic resonance imaging nationallicence Parkkola R. Department of Diagnostic Radiology, University Hospital of Turku, SF-20520, Turku, Finland aut Kujala U. Helsinki Research Institute for Sports and Exercise Medicine, Helsinki, Finland aut Rytökoski U. Rehabilitation Research Centre of Social Insurance Institution, Turku, Finland aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/5(1992-11-01), 383-387 0301-5548 65:5<383 1992 65 421 https://doi.org/10.1007/BF00243501 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00243501 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Parkkola R. Department of Diagnostic Radiology, University Hospital of Turku, SF-20520, Turku, Finland aut NATIONALLICENCE 700 1- Kujala U. Helsinki Research Institute for Sports and Exercise Medicine, Helsinki, Finland aut NATIONALLICENCE 700 1- Rytökoski U. Rehabilitation Research Centre of Social Insurance Institution, Turku, Finland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/5(1992-11-01), 383-387 0301-5548 65:5<383 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer