Validity analysis of the Biodex System 3 dynamometer under static and isokinetic conditions

• Autorzy: Zawadzki J. , Bobek T. , Siemieński A.
• Języki publikacji: EN

Abstrakty

EN

Isokinetic dynamometers are frequently used as training devices. They are also regularly employed to measure the characteristics of skeletal muscles under dynamic conditions. The combination of published data of such measurements and the authors’ own experience led to the present investigation of the validity of measurements performed using the Biodex System 3 dynamometer. Two individual dynamometers of the same type were used. A calibration technique was used to test the validity of measured torque and the angular coordinate of the position of the lever arm of the dynamometer under static conditions. The results of measurements performed under dynamic (isokinetic) conditions were verified by comparing numerical values of tests provided in the Biodex report and raw data collected directly from the measuring computer of the same isokinetic machine. The shapes of experimentally determined characteristics of torque Mmax(ů) and power P(ů) were also analysed, taking into consideration their conformity with the laws of thermodynamics and known properties of skeletal muscles. The static tests showed that the indications of the Biodex System 3 dynamometer lay within the error range specified by the manufacturer. Therefore, the results of static measurements can be considered accurate. According to the isokinetic tests, the values of angular velocity were also accurate. However, indications of torque and power were much less accurate, justifying the uncertainty over whether they can be considered true results of measurement.

Słowa kluczowe

EN

Hill-type curve; muscle torque; power; velocity

PL

hamownia izokinetyczna; mięśnie; pomiar

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2010
• Tom: Vol. 12, no. 4
• Strony: 25--32
• Opis fizyczny: Bibliogr. 15 poz., il.

Twórcy

autor

Zawadzki J.

autor

Bobek T.

autor

Siemieński A.

• Department of Biomechanics, University School of Physical Education in Wrocław, Poland,

Bibliografia

• [1] CHENG A.J., RICE C.L., Fatigue and recovery of power and isometric torque following isotonic knee extensions, Journal of Applied Physiology, 2005, 99, 1446-1452.
• [2] DESPLANTEZ A., GOUBEL F., In vivo force-velocity relation of human muscle: a modelling from sinusoidal oscillation behaviour, Journal of Biomechanics, 2002, 35, 1565-1573.
• [3] LANZA I.R., TOWSE T.F., CALDWELL G.E., WIGMORE D.M., KENT-BRAUN J.A., Effects of age on human muscle torque, velocity, and power in two muscle groups, Journal of Applied Physiology, 2003, 95, 2361-2369.
• [4] MARTIN A., MARTIN L., MORLON B., Theoretical and experimental behaviour of the muscle viscosity coefficient during maximal concentric actions, European Journal of Applied Physiology and Occupational Physiology, 1994, 69 (6), 539-544.
• [5] DESPLANTEZ A., CORNU C., GOUBEL F., Viscous properties of human muscle during contraction, Journal of Biomechanics, 1999, 32, 555-562.
• [6] AYALON M., BARAK Y., RUBINSTEIN M., Qualitative analysis of the isokinetic moment curve of the knee extensors, Isokinetics and Exercise Science, 2002, 10, 145-151.
• [7] MALERBA J.L., ADAM M.L., HARRIS B.A., KREBS D.E., Reliability of dynamic and isometric testing of shoulder external and internal rotators, The Journal of Orthopaedic and Sports Physical Therapy, 1993, 18(4), 543-552.
• [8] McCLEARY R.W., ANDERSEN J.C., Test-retest reliability of reciprocal isokinetic knee extension and flexion peak torque measurements, Journal of Athletic Training, 27(4), 362-365.
• [9] IOSSIFIDOU A.N., BALTZOPOULOS V., Relationship between peak moment, power and work corrected for the influence of inertial effects, Isokinetics and Exercise Science, 1992, 7, 79-86.
• [10] IOSSIFIDOU A.N., BALTZOPOULOS V., Inertial effects on the assessment of performance in isokinetic dynamometry, International Journal of Sports Medicine, 1998, 19, 567-573.
• [11] BYGOTT I.-L., McMEEKEN J., CARROLL S., STORY I., Gravity correction in trunk dynamometry: Is it reliable? Isokinetics and Exercise Science, 2001, 9, 1-9.
• [12] BYGOTT I.-L., McMEEKEN J., CARROLL S., STORY I., A preliminary analysis of the validity of gravity correction procedures applied in trunk dynamometry, Isokinetics and Exercise Science, 2001, 9, 53-64.
• [13] IVY J.L., WITHERS R.T., BROSE G., MAXWELL B.D., COSTILL D.L., Isokinetic contractile properties of the quadriceps with relation to fiber type, European Journal of Applied Physiology and Occupational Physiology, 1981, 47, 247-55.
• [14] HAWKINS D., SMEULDERS M., Relationship between knee joint torque, velocity, and muscle activation: considerations for musculoskeletal modelling, Journal of Applied Biomechanics, 1998, 14, 141-157.
• [15] WICKIEWICZ T.L., ROY R.R., POWELL P.L., PERRINE J.J., EDGERTON V.R., Muscle architecture and force-velocity relationships in humans, Journal of Applied Physiology, 1984, 57, 435-443.