The acquisition of maximal isometric plantar flexor strength: a force-time curve analysis.

A paradigm involving the static force-time curve was used to study the mechanisms through which gains in maximal isometric strength are achieved during repeated testing. Twelve males performed three maximal contractions of the plantar flexors on each of six test days. Each contraction was executed as rapidly as possible, with the force recorded on a rapidly moving pen recorder. Although highly significant increases in maximal plantar flexor strength occurred over the six days, no changes were seen in the maximal rate of tension development. However, assessment of the amount of force reached at absolute time intervals revealed that more force was attained at the early time intervals on the first few days of testing than on the later days, indicating a distinct change in the shape of the static force-time curve. Several neural mechanisms are suggested to explain the alteration in shape of the static force-time curve which accompanies the acquisition of maximal strength.

[1]  S. B. Vincent.  The function of the vibrissae in the behavior of the white rat , 1912 .

[2]  D. Lewis,et al.  Quantitative methods in psychology , 1950 .

[3]  H. Hufschmidt,et al.  Antagonist Inhibition as the Earliest Sign of a Sensory-Motor Reaction , 1954, Nature.

[4]  Brewerton Da,et al.  Discussion on an evaluation of the methods of increasing muscle strength. , 1956 .

[5]  F. A. Hellebrandt,et al.  Mechanisms of muscle training in man: experimental demonstration of the overload principle. , 1956, The Physical therapy review.

[6]  L. E. Morehouse,et al.  Effect of static and dynamic exercises on muscular strength and hypertrophy. , 1957, Journal of applied physiology.

[7]  Rose Dl,et al.  Effect of brief maximal exercise on the strength of the quadriceps femoris. , 1957 .

[8]  Joseph Royce.  Force-Time Characteristics of the Exertion and Release of Hand Grip Strength under Normal and Fatigued Conditions , 1962 .

[9]  Walter Kroll.  Reliability Variations of Strength in Test-Retest Situations , 1963 .

[10]  H J HISLOP.  Quantitative changes in human muscular strength during isometric exercise. , 1963, Journal of the American Physical Therapy Association.

[11]  E. Forward,et al.  Strength variations in two determinations of maximal isometric contractions. , 1965, Physical therapy.

[12]  QUANTITATIVE STRENGTH CHANGES WITH TEST REPETITIONS. , 1965, Physical therapy.

[13]  G. Somjen,et al.  FUNCTIONAL SIGNIFICANCE OF CELL SIZE IN SPINAL MOTONEURONS. , 1965, Journal of neurophysiology.

[14]  H M Mendler,et al.  Effect of stabilization on maximum isometric knee extensor force. , 1967, Physical therapy.

[15]  J. D. Whitley,et al.  Learning Component in Repetitive Maximal Static Contractions , 1968 .

[16]  D. Clarke,et al.  Force-time curves of voluntary muscular contraction at varying tensions. , 1968, Research quarterly.

[17]  Learning and tension as factors in static strength gains produced by static and eccentric training. , 1971, Research quarterly.

[18]  Gurfinktel' Vs,et al.  Work of human motor units during initiation of muscle tension , 1972 .

[19]  J. Tanji,et al.  Discharges of single motor units at voluntary contraction of abductor digiti minimi muscle in man. , 1972, Brain research.

[20]  J Tanji,et al.  Firing rate of individual motor units in voluntary contraction of abductor digiti minimi muscle in man. , 1973, Experimental neurology.

[21]  L. E. Smith.  Strength increments following massed and distributed practice relative to motor learning. , 1974, Medicine and science in sports.

[22]  Pierre Philippe LaGassé.  The prediction of maximum speed of human movement by two selected muscular coordination mechanisms and by maximum static strength and the effects of practice and fatigue upon maximum speed of human movement mechanisms : a dissertation , 1975 .

[23]  E. Asmussen,et al.  Mechano-elastic properties of human muscles at different temperatures. , 1976, Acta physiologica Scandinavica.

[24]  A. Lang,et al.  Change in motor unit firing rate after double discharge: An electromyogram study in man , 1977, Experimental Neurology.

[25]  Electromyographic and Girth Considerations Relative to Strength Training , 1977, Perceptual and motor skills.

[26]  G. L. Soderberg.  Below-knee amputee knee extension force-time and moment characteristics. , 1978, Physical therapy.

[27]  Emile Godaux,et al.  Ballistic contractions in fast or slow human muscles; discharge patterns of single motor units , 1978, The Journal of physiology.

[28]  P. Lagassé.  Prediction of Maximum Speed of Human Movement by Two Selected Muscular Coordination Mechanisms and by Maximum Static Strength , 1979, Perceptual and motor skills.

[29]  D. B. Myers,et al.  Hand grip function in patients with rheumatoid arthritis. , 1980, Archives of physical medicine and rehabilitation.

[30]  H. E. Desnedt,et al.  Spinal motoneuron recruitment in man: rank deordering with direction but not with speed of voluntary movement. , 1981, Science.

[31]  J T Viitasalo,et al.  Effects of fatigue on isometric force- and relaxation-time characteristics in human muscle. , 1981, Acta physiologica Scandinavica.

[32]  A. Mirka,et al.  Rate of tension development in isometric contractions of a human hand muscle , 1981, Experimental Neurology.