scholarly journals Ankle Mechanical Impedance Under Muscle Fatigue

2013 ◽  
Author(s):  
Shuo Wang ◽  
Hyunglae Lee ◽  
Neville Hogan
Keyword(s):  
Muscle Fatigue ◽  
Tibialis Anterior ◽  
Degrees Of Freedom ◽  
Mechanical Impedance ◽  
Muscle Group ◽  
Triceps Surae ◽  
Ankle Injuries ◽  
Two Degrees Of Freedom ◽  
Preliminary Results ◽  
Triceps Surae Muscle

This paper reports preliminary results on the effects of ankle muscle fatigue on ankle mechanical impedance. The experiment was designed to induce fatigue in the Tibialis Anterior and Triceps Surae muscle group by asking subjects to perform isometric contractions against a constant ankle torque generated by the Anklebot, a backdriveable robot that interacts with the ankle in two degrees of freedom. Median frequencies of surface electromyographic signals collected from Tibialis Anterior and Triceps Surae muscle group were evaluated to assess muscle fatigue. Using a standard multi-input and multi-output stochastic impedance identification method, multivariable ankle mechanical impedance was measured in two degrees of freedom under muscle fatigue. Preliminary results indicate that, for both Tibialis Anterior and Triceps Surae muscle group, ankle mechanical impedance decreases in both the dorsi-plantarflexion and inversion-eversion directions under muscle fatigue. This finding suggests that decreasing ankle impedance with muscle fatigue may help to develop joint support systems to prevent ankle injuries caused by muscle fatigue.

scholarly journals Muscle Heating With Megapulse II Shortwave Diathermy and ReBound Diathermy

2013 ◽  
Vol 48 (4) ◽  
pp. 477-482 ◽  
Author(s):  
David O. Draper ◽  
Amanda R. Hawkes ◽  
A. Wayne Johnson ◽  
Mike T. Diede ◽  
Justin H. Rigby
Keyword(s):  
Heat Dissipation ◽  
Subcutaneous Fat ◽  
Muscle Group ◽  
Triceps Surae ◽  
Tissue Temperature ◽  
Measured Temperature ◽  
Temperature Decay ◽  
Triceps Surae Muscle ◽  
Subcutaneous Fat Thickness ◽  
Shortwave Diathermy

Context: A new continuous diathermy called ReBound recently has been introduced. Its effectiveness as a heating modality is unknown. Objective: To compare the effects of the ReBound diathermy with an established deep-heating diathermy, the Megapulse II pulsed shortwave diathermy, on tissue temperature in the human triceps surae muscle. Design:  Crossover study. Setting: University research laboratory. Patients or Other Participants: Participants included 12 healthy, college-aged volunteers (4 men, 8 women; age = 22.2 ± 2.25 years, calf subcutaneous fat thickness = 7.2 ± 1.9 mm). Intervention(s):  Each modality treatment was applied to the triceps surae muscle group of each participant for 30 minutes. After 30 minutes, we removed the modality and recorded temperature decay for 20 minutes. Main Outcome Measure(s): We horizontally inserted an implantable thermocouple into the medial triceps surae muscle to measure intramuscular tissue temperature at 3 cm deep. We measured temperature every 5 minutes during the 30-minute treatment and each minute during the 20-minute temperature decay. Results: Tissue temperature at a depth of 3 cm increased more with Megapulse II than with ReBound diathermy over the course of the treatment (F6,66 = 10.78, P < .001). ReBound diathermy did not produce as much intramuscular heating, leading to a slower heat dissipation rate than the Megapulse II (F20,220 = 28.84, P < .001). Conclusions:  During a 30-minute treatment, the Megapulse II was more effective than ReBound diathermy at increasing deep, intramuscular tissue temperature of the triceps surae muscle group.

scholarly journals Estimation of the Two Degrees-of-Freedom Time-Varying Impedance of the Human Ankle

2018 ◽  
Vol 12 (1) ◽  
Author(s):  
Evandro Ficanha ◽  
Guilherme Ribeiro ◽  
Lauren Knop ◽  
Mo Rastgaar
Keyword(s):  
Degrees Of Freedom ◽  
Mechanical Impedance ◽  
Heel Strike ◽  
Time Varying ◽  
Two Degrees Of Freedom ◽  
Impedance Modulation ◽  
Ankle Stiffness ◽  
Human Ankle ◽  
Stiffness And Damping ◽  
And Inversion

An understanding of the time-varying mechanical impedance of the ankle during walking is fundamental in the design of active ankle-foot prostheses and lower extremity rehabilitation devices. This paper describes the estimation of the time-varying mechanical impedance of the human ankle in both dorsiflexion–plantarflexion (DP) and inversion–eversion (IE) during walking in a straight line. The impedance was estimated using a two degrees-of-freedom (DOF) vibrating platform and instrumented walkway. The perturbations were applied at eight different axes of rotation combining different amounts of DP and IE rotations of four male subjects. The observed stiffness and damping were low at heel strike, increased during the mid-stance, and decreases at push-off. At heel strike, it was observed that both the damping and stiffness were larger in IE than in DP. The maximum average ankle stiffness was 5.43 N·m/rad/kg at 31% of the stance length (SL) when combining plantarflexion and inversion and the minimum average was 1.14 N·m/rad/kg at 7% of the SL when combining dorsiflexion and eversion. The maximum average ankle damping was 0.080 Nms/rad/kg at 38% of the SL when combining plantarflexion and inversion, and the minimum average was 0.016 Nms/rad/kg at 7% of the SL when combining plantarflexion and eversion. From 23% to 93% of the SL, the largest ankle stiffness and damping occurred during the combination of plantarflexion and inversion or dorsiflexion and eversion. These rotations are the resulting motion of the ankle's subtalar joint, suggesting that the role of this joint and the muscles involved in the ankle rotation are significant in the impedance modulation in both DP and IE during gait.

scholarly journals Influence of Knee Flexion Angle and Age on Triceps Surae Muscle Fatigue During Heel Raises

2012 ◽  
Vol 26 (11) ◽  
pp. 3134-3147 ◽  
Author(s):  
Kim Hébert-Losier ◽  
Anthony G. Schneiders ◽  
José A. García ◽  
S. John Sullivan ◽  
Guy G. Simoneau
Keyword(s):  
Muscle Fatigue ◽  
Knee Flexion ◽  
Triceps Surae ◽  
Flexion Angle ◽  
Knee Flexion Angle ◽  
Triceps Surae Muscle

scholarly journals Distribution patterns of fibre types in the triceps surae muscle group of chimpanzees and orangutans

2011 ◽  
Vol 218 (4) ◽  
pp. 402-412 ◽  
Author(s):  
Julia P. Myatt ◽  
Nadja Schilling ◽  
Susannah K. S. Thorpe
Keyword(s):  
Distribution Patterns ◽  
Muscle Group ◽  
Triceps Surae ◽  
Fibre Types ◽  
Triceps Surae Muscle

A comparison of H-reflex in the triceps surae muscle group in patients with S1 radiculopathy

2017 ◽  
Vol 34 (4) ◽  
pp. 213-218
Author(s):  
Mohammad Reza Emad ◽  
Hadi Momeninejad ◽  
Babak Pourabbas Tahvildari ◽  
Hossein Yari
Keyword(s):  
H Reflex ◽  
Muscle Group ◽  
Triceps Surae ◽  
Triceps Surae Muscle

Effect of neuromuscular electrical stimulation intensity over the tibial nerve trunk on triceps surae muscle fatigue

2013 ◽  
Vol 114 (2) ◽  
pp. 317-329 ◽  
Author(s):  
Aude-Clémence M. Doix ◽  
Boris Matkowski ◽  
Alain Martin ◽  
Karin Roeleveld ◽  
Serge S. Colson
Keyword(s):  
Electrical Stimulation ◽  
Muscle Fatigue ◽  
Tibial Nerve ◽  
Neuromuscular Electrical Stimulation ◽  
Nerve Trunk ◽  
Triceps Surae ◽  
Stimulation Intensity ◽  
Triceps Surae Muscle

Function of the triceps surae muscle group in low and high arched feet: An exploratory study

The Foot ◽  
2012 ◽  
Vol 22 (2) ◽  
pp. 56-59 ◽  
Author(s):  
Helen Branthwaite ◽  
Anand Pandyan ◽  
Nachiappan Chockalingam
Keyword(s):  
Exploratory Study ◽  
Muscle Group ◽  
Triceps Surae ◽  
Triceps Surae Muscle

Evaluation of musculotendinous stiffness in prepubertal children and adults, taking into account muscle activity

2003 ◽  
Vol 95 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Daniel Lambertz ◽  
Isabelle Mora ◽  
Jean-Francois Grosset ◽  
Chantal Pérot
Keyword(s):  
Muscle Activity ◽  
Tibialis Anterior ◽  
Muscle Activation ◽  
Muscle Group ◽  
Triceps Surae ◽  
Stiffness Index ◽  
Prepubertal Children ◽  
Surface Electromyograms ◽  
Different Levels ◽  
Musculotendinous Stiffness

Musculotendinous (MT) stiffness of the triceps surae (TS) muscle group was quantified in 28 prepubertal children (7–10 yr) by using quick-release movements at different levels of submaximal contractions. Surface electromyograms (EMG) of each part of the TS and of the tibialis anterior were also recorded. A stiffness index, defined as the slope of the angular stiffness-torque relationship (SIMT-Torque), was used to quantify changes in MT stiffness with age. Results showed a significant decrease in SIMT-Torque with age, ranging from 4.02 ± 0.29 to 2.88 ± 0.31 rad-1 for the youngest to the oldest children. Because an increase in stiffness with age was expected due to the maturation of elastic tissues, overactivation of the TS was suspected to contribute to the higher SIMT-Torque values found in the youngest children. TS EMG-torque analyses confirmed that neuromuscular efficiency was significantly lower for the 7- or 8-yr-old children compared with 10-yr-old children, notably due to a higher degree of tibialis anterior coactivation found in the youngest children. Thus the stiffness index originally defined as the slope of the angular stiffness-EMG relationship increased significantly with age toward adult values. The results underlined the necessity to take into account the capacities of muscle activation to quantify changes in elastic properties of muscles, when those capacities are suspected to be altered.

Sign in / Sign up

Export Citation Format

Share Document