Fatigue responses of human triceps surae muscles during repetitive maximal isometric contractions

2000 ◽  
Vol 88 (6) ◽  
pp. 1969-1975 ◽  
Author(s):  
Yasuo Kawakami ◽  
Kenji Amemiya ◽  
Hiroaki Kanehisa ◽  
Shigeki Ikegawa ◽  
Tetsuo Fukunaga
Keyword(s):  
Plantar Flexion ◽  
Triceps Surae ◽  
Peripheral Fatigue ◽  
Isometric Contractions ◽  
Electromyographic Activity ◽  
Full Extension ◽  
Flexor Muscles ◽  
Human Triceps Surae ◽  
Triceps Surae Muscles ◽  
Plantar Flexor Muscles

Nine healthy men (22–45 yr) completed 100 repetitive maximal isometric contractions of the ankle plantar flexor muscles in two knee positions of full extension (K0) and flexion at 90° (K90), positions that varied the contribution of the gastrocnemii. Electromyographic activity was recorded from the medial and lateral gastrocnemii and soleus muscles by using surface electrodes. Plantar flexion torque in K0 was greater and decreased more rapidly than in K90. The electromyographic amplitude decreased over time, and there were no significant differences between muscles and knee joint positions. The level of voluntary effort, assessed by a supramaximal electrical stimulation during every 10th contraction, decreased from 96 to 70% ( P < 0.05) with no difference between K0 and K90. It was suggested that a decrease in plantar flexion torque was attributable to both central and peripheral fatigue and that greater fatigability in K0 than in K90 would result from a greater contribution and hence more pronounced fatigue of the gastrocnemius muscle. Further support for this possibility was provided from changes in twitch torque.

Architectural and functional features of human triceps surae muscles during contraction

1998 ◽  
Vol 85 (2) ◽  
pp. 398-404 ◽  
Author(s):  
Yasuo Kawakami ◽  
Yoshiho Ichinose ◽  
Tetsuo Fukunaga
Keyword(s):  
Plantar Flexion ◽  
Triceps Surae ◽  
Passive Condition ◽  
Human Triceps Surae ◽  
Functional Features ◽  
The Subject ◽  
Triceps Surae Muscles ◽  
Ultrasonic Images ◽  
Elastic Characteristics

Architectural properties of the triceps surae muscles were determined in vivo for six men. The ankle was positioned at 15° dorsiflexion (−15°) and 0, 15, and 30° plantar flexion, with the knee set at 0, 45, and 90°. At each position, longitudinal ultrasonic images of the medial (MG) and lateral (LG) gastrocnemius and soleus (Sol) muscles were obtained while the subject was relaxed (passive) and performed maximal isometric plantar flexion (active), from which fascicle lengths and angles with respect to the aponeuroses were determined. In the passive condition, fascicle lengths changed from 59, 65, and 43 mm (knee, 0°; ankle, −15°) to 32, 41, and 30 mm (knee, 90° ankle, 30°) for MG, LG, and Sol, respectively. Fascicle shortening by contraction was more pronounced at longer fascicle lengths. MG had greatest fascicle angles, ranging from 22 to 67°, and was in a very disadvantageous condition when the knee was flexed at 90°, irrespective of ankle positions. Different lengths and angles of fascicles, and their changes by contraction, might be related to differences in force-producing capabilities of the muscles and elastic characteristics of tendons and aponeuroses.

scholarly journals MRI MEASUREMENT OF IN VIVO BEHAVIOR OF HUMAN TRICEPS SURAE DURING VOLUNTARY SUBMAXIMAL ISOMETRIC CONTRACTIONS

2003 ◽  
Vol 35 (Supplement 1) ◽  
pp. S384
Author(s):  
A M. Lai ◽  
J A. Hodgson ◽  
T Finni ◽  
V R. Edgerton ◽  
J C. Puffer ◽  
...  
Keyword(s):  
Triceps Surae ◽  
Isometric Contractions ◽  
Human Triceps Surae

Stiffness regulation provided by short-latency reflexes in human triceps surae muscles

1982 ◽  
Vol 234 (1) ◽  
pp. 159-164 ◽  
Author(s):  
J.H.J. Allum ◽  
K.-H. Mauritz ◽  
H. Vo¨gele
Keyword(s):  
Short Latency ◽  
Triceps Surae ◽  
Human Triceps Surae ◽  
Triceps Surae Muscles

Electromyogram patterns during plantarflexions at various angular velocities and knee angles in human triceps surae muscles

1996 ◽  
Vol 75 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Hiroyuki Tamaki ◽  
Kohji Kitada ◽  
T. Akamine ◽  
Takashi Sakou ◽  
Hiroshi Kurata
Keyword(s):  
Triceps Surae ◽  
Human Triceps Surae ◽  
Angular Velocities ◽  
Triceps Surae Muscles

scholarly journals In Vivo Human Gastrocnemius Architecture With Changing Joint Angle at Rest and During Graded Isometric Contraction of Normal and Weak Muscle

2020 ◽  
pp. 010-014
Author(s):  
Koryak Yuri
Keyword(s):  
Isometric Contraction ◽  
Plantar Flexion ◽  
Normal Subjects ◽  
Triceps Surae ◽  
Mean Values ◽  
Patient Groups ◽  
Triceps Surae Muscles ◽  
Muscle Changes ◽  
Ultrasonic Images

Architectural properties of the triceps surae muscles complex were determined In Vivo for thirty subjects. These subjects were assigned to two groups. The first group of subjects consisted of 8 healthy men and the second group of subjects was composed of 22 patients with motor disorders. The ankle was positioned at -15 ° (dorsiflexion), and 0 ° (neutral anatomical position), and 15 °, and 30 ° (plantarflexion), with the knee set at 120 °and with an angle in the ankle joint of 90 °. At each position, longitudinal ultrasonic images of the Medial (MG) and Lateral (LG) Gastrocnemius and Soleus (SOL) muscles were obtained while the subject was relaxed (passive) and performed 50 % maximal voluntary isometric plantar flexion (active), from which fascicle Lengths (L) and angles (Θ) with respect to the aponeuroses were determined. From the ultrasonic image, it was observed that and Θ changed during an isometric contraction of the triceps surae muscle. Changes in L and were expressed as a function of relative torque. The Θ change was not identical for the three muscles. The fascicle Θ of MG demonstrated the greatest variation in three muscles. The effects of activation and relaxation positions were significant in all three muscles. The differences in MG fascicle Θ because of changes in ankle positions were significant among control and patients both in the passive and active conditions. Fascicle Θ of LG and SOL not differed among control and patient in the relaxation condition but not in the activation condition. For LG, and SOL ol fascicle Θ were changes were larger in control with the patients. The mean values fascicle Θ of MG, LG, and SOL an isometric contraction (50 % MVC) in the control groups increased by 60 %, 41 %, and 41 %, respectively; in the patient groups were a smaller increase, by 28 %, 26 %, and 36 %, respectively. Different lengths and angles of fascicles, and their changes bу contraction by patients and normal subjects, might bе related to differences in force-producing capabilities of the muscles and elastic characteristics of tendons and aponeuroses.

Effect of toe extension on EMG of triceps surae muscles during isometric dorsiflexion

2016 ◽  
Vol 61 (6) ◽  
Author(s):  
Ariba Siddiqi ◽  
Sridhar P. Arjunan ◽  
Dinesh Kumar
Keyword(s):  
Root Mean Square ◽  
Plantar Flexion ◽  
T Test ◽  
Triceps Surae ◽  
Mean Square ◽  
Force Of Contraction ◽  
Large Variability ◽  
Triceps Surae Muscles ◽  
Student’S T ◽  
Student’S T Test

AbstractThe protocol for estimating force of contraction by triceps surae (TS) muscles requires the immobilization of the ankle during dorsiflexion and plantar flexion. However, large variability in the results has been observed. To identify the cause of this variability, experiments were conducted where ankle dorsiflexion force and electromyogram (EMG) of the TS were recorded under two conditions: (i) toes were strapped and (ii) toes were unstrapped, with all other conditions such as immobilization of the ankle remaining unchanged. The root mean square (RMS) of the EMG and the force were analyzed and one-tail Student’s t-test was performed for significance between the two conditions. The RMS of the EMG from TS muscles was found to be significantly higher (~55%) during dorsiflexion with toes unstrapped compared with when the toes were strapped. The torque corresponding to dorsiflexion was also higher with toes unstrapped. Our study has shown that it is important to strap the toes when measuring the torque at the ankle and EMG of the TS muscles.

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