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.
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References
Alanen A, Kantola I, Komu M (1989) New imaging methods in hereditary neuromuscular diseases. Acta Cardiomiol 1:33–45
Arnonoo-Kuofi HS (1983) The density of muscle spindles in the medial, intermediate and lateral columns of human intrinsic postvertebral muscles. J Anat 136:509–519
Beimborn DS, Morrissey MC (1988) A review of the literature related to trunk muscle performance. Spine 13:655–660
Dixon WJ (1983) BMDP statistical software. University of California Press, Berkeley, pp 1–733
Durnin JVGA, Womersley J (1974) Body fat assessed from total body density and its estimation from skinfold thickness: measurements on 481 men and women aged from 16 to 72 years. Br J Nutr 32:77–97
Hasue M, Fujiwara J, Kikuchi S (1980) A new method of quantitative measurement of abdominal and back muscle strength. Spine 5:143–148
Hinshaw WS, Andrew ER, Bottomley PA, Holland GN, Moore WS, Worthington BS (1979) An in vivo study of the forearm and hand by thin section NMR imaging. Br J Radiol 52:36–43
Ikai M, Fukunaga T (1968) Calculation of muscle strength per unit cross-sectional area of human muscle by means of ultrasonic measurement. Int Z Angew Physiol 26:26–32
Maughan RJ, Watson JS, Wier J (1983a) Strength and cross-sectional area of human skeletal muscle. J Physiol (Lond) 338:37–49
Maughan RJ, Watson JS, Weir J (1983b) Relationship between muscle strength and muscle cross-sectional area in male sprinters and endurance runners. Eur J Appl Physiol 50:309–318
McCullagh P, Maughan RJ, Watson JS, Weir J (1983) Biomechanical analysis of the knee in relation to the measured quadriceps strength and cross-sectional area in man. J Physiol (Lond) 346:60
McGill SM, Patt N, Norman RW (1988) Measurement of the trunk musculature of active males using CT scan radiography: implications for force and moment generating capacity about the L4/L5 joint. J Biomech 21:329–341
Miller JAA, Schmatz C, Schultz AB (1988) Lumbar disc degeneration: correlation with age, sex and spine level in 600 autopsy specimens. Spine 13:173–178
Modic MT, Pavlicek W, Weinstein MA, Boumphrey F, Ngo F, Hardy R, Duchesneau PM (1984) Magnetic resonance imaging of intervertebral disc disease. Radiology 152:103–111
Murphy WA, Totty WG, Carroll JE (1986) MRI of normal and pathologic skeletal muscle. AJR 146:565–574
Narici MV, Roi GS, Landoni L (1988) Force of knee extensor and flexor muscles and cross-sectional area determined by nuclear magnetic resonance imaging. Eur J Appl Physiol 57:39–44
Nygaard E, Houston M, Suzuki Y, Jorgensen K, Saltin B (1983) Morphology of the brachial biceps muscle and elbow flexion in man. Acta Physiol Scand 117:287–292
Parnianpour M, Nordin M, Kahanovitz N, Frankel V (1988) The triaxial coupling of torque generation of trunk muscles during isometric exertions and the effect of fatiguing isoinertial movements on the motor output and movement patterns. Spine 13:982–992
Parkkola R, Kormano M (1992) Disc and back muscle degeneration on MRI — correlation to age and body mass. J Spinal Dis 5:86–92
Pettersson H, Harnlin DJ, Mancuso A, Scott KN (1985) Magnetic resonance imaging of the musculoskeletal system. Acta Radiol 26:225–233
Reid JG, Costigan PA (1985) Geometry of adult rectus abdominis and erector spinae muscles. J Orthop Sports Phys Ther 6:278–280
Reid JG, Costigan PA (1987) Trunk muscle balance and muscular force. Spine 12:783–786
Scott JA, Rosenthal DI, Brady TJ (1984) The evaluation of musculoskeletal disease with magnetic resonance imaging. Radiol Clin North Am 22:917–924
Tertti MO, Salminen JJ, Paajanen HEK, Terho PH, Kormano MJ (1991) Low-back pain and disc degeneration in children: a case-control MR imaging study. Radiology 180:503–507
Tracy MF, Gibson MJ, Scypryt EP, Rutherford A, Corlett EN (1989) The geometry of the muscles of the lumbar spine determined by magnetic resonance imaging. Spine 14:186–193
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Parkkola, R., Kujala, U. & Rytökoski, U. Response of the trunk muscles to training assessed by magnetic resonance imaging and muscle strength. Europ. J. Appl. Physiol. 65, 383–387 (1992). https://doi.org/10.1007/BF00243501
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DOI: https://doi.org/10.1007/BF00243501