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J Athl Train. 1993 Fall; 28(3): 221-222, 224-225.
PMCID: PMC1317717

The Effect of Stabilization on Isokinetic Knee Extension and Flexion Torque Production

S. Peter Magnusson, PT
S. Peter Magnusson is Supervisor of Physical Therapy at Nicholas Institute of Sports Medicine and Athletic Trauma (NISMAT), Lenox Hill Hospital, New York, NY 10021.
Richard A. Geismar, PT
Richard A. Geismar is Physical Therapy Student at Columbia University, New York.
Gilbert W. Gleim, PhD
Gilbert W. Gleim is Director of Research at NISMAT.

Abstract

The purpose of this study was to examine the effect of four methods of stabilization on maximal reciprocal isokinetic knee extension and flexion. Left knee extension/flexion was tested at 60°/s in 20 subjects. Warm-up consisted of five submaximal and one maximal effort followed by three maximal efforts in each of four randomized stabilization conditions: 1) Hands and back stabilization; the trunk was strapped to the back rest and the hands grasped the seat. 2) Back stabilization; the trunk was strapped to the back rest and the hands were folded across the chest. 3) Hand stabilization; the hands grasped the seat and the back rest was removed. 4) No stabilization; the hands were folded across the chest and the back rest was removed. One-way repeated measures ANOVA showed a significant effect of stabilization for knee extension (F(3,57)=17.44, p=.0001) and knee flexion (F(3,57)= 5.37, p=.002). Paired, two-tailed student's t-tests with Bonferroni correction showed that, in knee extension, no stabilization was significantly less than all others, p<.001. In addition, back stabilization was less than hands and back stabilization, p<.005. In knee flexion, no stabilization was significantly less than all others, p<.01. In conclusion, the method of trunk stabilization significantly affected maximal reciprocal isokinetic knee extension/flexion strength measurements. Maximal knee extension/flexion torque production was achieved when the trunk was strapped to the back support and when the hands grasped the seat.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Bohannon RW, Gajdosik RL, LeVeau BF. Isokinetic knee flexion and extension torque in the upright sitting and semireclined sitting positions. Phys Ther. 1986 Jul;66(7):1083–1086. [PubMed]
  • Currier DP. Positioning for knee strengthening exercises. Phys Ther. 1977 Feb;57(2):148–152. [PubMed]
  • Hart DL, Stobbe TJ, Till CW, Plummer RW. Effect of trunk stabilization on quadriceps femoris muscle torque. Phys Ther. 1984 Sep;64(9):1375–1380. [PubMed]
  • HOUTZ SJ, LEBOW MJ, BEYER FR. Effect of posture on strength of the knee flexor and extensor muscles. J Appl Physiol. 1957 Nov;11(3):475–480. [PubMed]
  • IKAI M, STEINHAUS AH. Some factors modifying the expression of human strength. J Appl Physiol. 1961 Jan;16:157–163. [PubMed]
  • Magnusson SP, Gleim GW, Nicholas JA. Subject variability of shoulder abduction strength testing. Am J Sports Med. 1990 Jul-Aug;18(4):349–353. [PubMed]
  • Mawdsley RH, Knapik JJ. Comparison of isokinetic measurements with test repetitions. Phys Ther. 1982 Feb;62(2):169–172. [PubMed]
  • Mendler HM. Effect of stabilization on maximum isometric knee extensor force. Phys Ther. 1967 May;47(5):375–379. [PubMed]
  • Murray DA. Optimal filtering of constant velocity torque data. Med Sci Sports Exerc. 1986 Dec;18(6):603–611. [PubMed]
  • Otis JC, Gould JD. The effect of external load on torque production by knee extensors. J Bone Joint Surg Am. 1986 Jan;68(1):65–70. [PubMed]
  • Ottenbacher KJ. Statistical conclusion validity. Multiple inferences in rehabilitation research. Am J Phys Med Rehabil. 1991 Dec;70(6):317–322. [PubMed]
  • Sahlin K, Ren JM. Relationship of contraction capacity to metabolic changes during recovery from a fatiguing contraction. J Appl Physiol (1985) 1989 Aug;67(2):648–654. [PubMed]
  • Sapega AA. Muscle performance evaluation in orthopaedic practice. J Bone Joint Surg Am. 1990 Dec;72(10):1562–1574. [PubMed]
  • Sapega AA, Nicholas JA, Sokolow D, Saraniti A. The nature of torque "overshoot" in Cybex isokinetic dynamometry. Med Sci Sports Exerc. 1982;14(5):368–375. [PubMed]
  • SCHENCK JM, FORWARD EM. QUANTITATIVE STRENGTH CHANGES WITH TEST REPETITIONS. Phys Ther. 1965 Jun;45:562–569. [PubMed]
  • Sinacore DR, Rothstein JM, Delitto A, Rose SJ. Effect of damp on isokinetic measurements. Phys Ther. 1983 Aug;63(8):1248–1250. [PubMed]

Articles from Journal of Athletic Training are provided here courtesy of National Athletic Trainers Association