Summary
The immediate effects of an imposed myotatic stretch on knee extensor force were studied in 12 high-strength and 12 low-strength men. Under nonfatigued pre-exercise conditions, significant tension increases of 6.5% for the high-strength group and 11.0% for low-strength subjects were observed as a result of the imposed stretch. An exercise treatment involving 28 serial isometric contractions, each of 5 s duration, with an intertrial rest period of 10 s was administered. This fatiguing exercise resulted in significant decrements in strength on the order of 28.0% and 18.5% for the high-strength and low-strength groups, respectively. A similar treatment which included a 1 s imposed myotatic stretch during each trial resulted in a greater strength decrement for the lowstrength group (26.4%) than for the high-strength subjects (15.0%). A neural factor involving the stretch reflex is tentatively suggested as a plausible explanation accounting for the observation that high-strength subjects fatigue faster than low-strength subjects under conditions of isometric exercise, while lowstrength subjects fatigue faster than high-strength individuals in isometric exercise which is performed with an imposed stretch.
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References
Asmussen, E.: Positive and negative muscular work. Acta Physiol. Scand. 28, 364–381 (1953)
Asmussen, E.: Storage of elastic energy and mechanical efficiency of human muscles. Acta Physiol. Scand. Suppl. 440, 13 (1976)
Bonde-Petersen, F., Knuttgen, H. G.: Effect of training with eccentric muscle contractions on human skeletal muscle metabolites. Acta Physiol. Scand. 80, 16A-17A (1970)
Carlson, B. R.: Cross transfer during flexor serial isometric trials. Am. Correct Ther. J. 27, 36–40 (1973)
Carpenter, M. B.: Upper and lower motor neurons. In: Physiological Basis of Rehabilitation Medicine (J. A. Downey, R. C. Darling, eds.). Philadelphia: Saunders 1971
Cavagna, G. A.: Storage and utilization of elastic energy in skeletal muscle. In: Exercise and Sport Sciences Reviews (R. S. Hutton, ed.), pp. 89–129. Santa Barbara: Journal Publ. 1977
Cavagna, G. A., Citterio, G.: Effect of stretching on the elastic characteristics and the contractile component of frog striated muscle. J. Physiol. (Lond.) 239, 1–14 (1974)
Cavagna, G. A., Dusman, B., Margaria, R.: Positive Work Done by a Previously Stretched Muscle. J. Appl. Physiol. 24, 21–32 (1968)
Curtin, N. A., Svensson, S. M. M., Davies, R. E.: Force development and the braking mechanism in stretching activated muscle is not limited by the energy from ATP splitting. Fed. Proc. 29, 714 (1970)
Fenn, W. O.: Frictional and kinetic factors in the work of sprint running. Am. J. Physiol. 92, 582–611 (1930)
Grant, D. A.: Analysis of variance tests in the analysis and comparison of curves. Psychol. Bull. 53, 141–154 (1956)
Infante, A. A., Klaupiks, D., Davies, R. E.: Adenosine Triphosphate: Changes in Muscles Doing Negative Work. Science 144, 1577–1578 (1964)
Joyce, G. C., Rack, P. M. H., Westbury, D. R.: The mechanical properties of cat soleus muscle during controlled lengthening and shortening movements. J. Physiol. (Lond.) 204, 461–474 (1969)
Komi, P. V.: Relationship between muscle tension, EMG and velocity of contraction under concentric and eccentric work. In: New Developments in Electromyography and Clinical Neurophysiology (J. E. Desmedt, ed.), pp. 596–606. Basel: Karger 1973
Komi, P. V., and Viitasalo, J. T.: Changes in motor-unit acitvity and metabolism in human skeletal muscle during and after repeated eccentric and concentric contractions. Acta Physiol. Scand. 100, 246–254 (1977)
Kroll, W.: Level of isometric strength and isometric endurance in repeated contractions. Res. Q. Am. Assoc. Health Phys. Educ. 37, 375–383 (1966)
Kroll, W.: Isometric fatigue curves under varied intertrial recuperation periods. Res. Q. Am. Assoc. Health Phys. Educ. 39, 106–115 (1967)
Kroll, W.: Effects of local muscular fatigue due to isotonic and isometric exercise upon fractionated reaction time components. J. Mot. Behav. 5, 81–93 (1973)
Lagasse, P. P.: Muscle strength: Ipsilateral and contralateral effects of superimposed stretch. Arch. Phys. Med. Rehabil. 55, 305–310 (1974)
Marsden, C. D., Merton, P. A., Morton, H. B.: Servo action in human voluntary movement. Nature 238, 140–143 (1972)
Milner-Brown, H. S., Stein, R. B., Lee, R. G.: Synchronization of human motor units: Possible roles of exercise and supraspinal reflexes. Electroencephalogr. Clin. Neurophysiol. 38, 245–254 (1975)
Morris, A. F.: Myotatic reflex effects on bilateral reciprocal leg strength. Am. Correct Ther. J. 28, 24–29 (1974)
Stepanov, A. S., Burlakov, M. L.: Electrophysiological investigation of fatigue in muscular activity. Sechenov physiol. J. U.S.S.R. 47, 43–47 (1961)
Williams, M., Lissner, H. R.: Biomechanical analysis of knee function. J. Am. Phys. Ther. Assoc. 43, 93–99 (1963)
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Kamen, G. Serial isometric contractions under imposed myotatic stretch conditions in high-strength and low-strength men. Europ. J. Appl. Physiol. 41, 73–82 (1979). https://doi.org/10.1007/BF00421654
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DOI: https://doi.org/10.1007/BF00421654