scholarly journals Dynamic optimization of stimulation frequency to reduce isometric muscle fatigue using a modified Hill‐Huxley model

2017 ◽  
Vol 57 (4) ◽  
pp. 634-641 ◽  
Author(s):  
Brian D. Doll ◽  
Nicholas A. Kirsch ◽  
Xuefeng Bao ◽  
Brad E. Dicianno ◽  
Nitin Sharma
Keyword(s):  
Muscle Fatigue ◽  
Dynamic Optimization ◽  
Stimulation Frequency ◽  
Isometric Muscle

Unilateral isometric muscle fatigue decreases force production and activation of contralateral knee extensors but not elbow flexors

2014 ◽  
Vol 39 (12) ◽  
pp. 1338-1344 ◽  
Author(s):  
Israel Halperin ◽  
David Copithorne ◽  
David G. Behm
Keyword(s):  
Muscle Fatigue ◽  
Force Production ◽  
Voluntary Activation ◽  
Knee Extensors ◽  
Elbow Flexors ◽  
Post Intervention ◽  
Nonlocal Effects ◽  
And Performance ◽  
Voluntary Contractions ◽  
Isometric Muscle

Nonlocal muscle fatigue occurs when fatiguing 1 muscle alters performance of another rested muscle. The purpose of the study was to investigate if fatiguing 2 separate muscles would affect the same rested muscle, and if fatiguing the same muscle would affect 2 separate muscles. Twenty-one trained males participated in 2 studies (n = 11; n = 10). Subjects performed 2 pre-test maximum voluntary contractions (MVCs) with the nondominant knee extensors. Thereafter they performed two 100-s MVCs with their dominant knee extensors, elbow flexors, or rested. Between and after the sets, a single MVC with the nondominant rested knee extensors was performed. Subsequently, 12 nondominant knee extensors repeated MVCs were completed. Force, quadriceps voluntary activation (VA), and electromyography (EMG) were measured. The same protocol was employed in study 2 except the nondominant elbow-flexors were tested. Study 1: Compared with control conditions, a significant decrease in nondominant knee extensors force, EMG, and VA was found under both fatiguing conditions (P ≤ 0.05; effect size (ES) = 0.91–1.15; 2%–8%). Additionally, decrements in all variables were found from the first post-intervention MVC to the last (P ≤ 0.05; ES = 0.82–2.40; 9%–20%). Study 2: No differences were found between conditions for all variables (P ≥ 0.33; ES ≤ 0.2; ≤3.0%). However, all variables decreased from the first post-intervention MVC to the last (P ≤ 0.05; ES = 0.4–3.0; 7.2%–19.7%). Whereas the rested knee extensors demonstrated nonlocal effects regardless of the muscle being fatigued, the elbow-flexors remained unaffected. This suggests that nonlocal effects are muscle specific, which may hold functional implications for training and performance.

Effects of stimulation frequency, amplitude, and impulse width on muscle fatigue

2015 ◽  
Vol 53 (4) ◽  
pp. 608-616 ◽  
Author(s):  
Michael Behringer ◽  
Sebastian Grützner ◽  
Johannes Montag ◽  
Molly McCourt ◽  
Matthias Ring ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Stimulation Frequency

Reversal of muscle fatigue during 16 h of heavy intermittent cycle exercise

2004 ◽  
Vol 97 (6) ◽  
pp. 2166-2175 ◽  
Author(s):  
H. J. Green ◽  
T. A. Duhamel ◽  
S. Ferth ◽  
G. P. Holloway ◽  
M. M. Thomas ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Muscle Fatigue ◽  
Intermittent Exercise ◽  
Low Frequency ◽  
Quadriceps Muscle ◽  
Stimulation Frequency ◽  
Peak Oxygen Consumption ◽  
Force Frequency ◽  
Reduction In Force ◽  
Before And After

This study examined the effects of extended sessions of heavy intermittent exercise on quadriceps muscle fatigue and weakness. Twelve untrained volunteers (10 men and 2 women), with a peak oxygen consumption of 44.3 ± 2.3 ml·kg−1·min−1, exercised at ∼91% peak oxygen consumption for 6 min once per hour for 16 h. Muscle isometric properties assessed before and after selected repetitions (R1, R2, R4, R7, R12, and R15) were used to quantitate fatigue (before vs. after repetitions) and weakness (before vs. before repetitions). Muscle fatigue at R1 was indicated by reductions ( P < 0.05) in peak twitch force (135 ± 13 vs. 106 ± 11 N) and by a reduction ( P < 0.05) in the force-frequency response, which ranged between ∼53% at 10 Hz (113 ± 12 vs. 52.6 ± 7.4 N) and ∼17% at 50 Hz (324 ± 27 vs. 270 ± 30 N). No recovery of force, regardless of stimulation frequency, was observed during the 54 min between R1 and R2. At R2 and for all subsequent repetitions, no reduction in force, regardless of stimulation frequency, was generally found after the exercise. The only exception was for R2, where, at 20 Hz, force was reduced ( P < 0.05) by 18%. At R15, force before repetitions for high frequencies (i.e., 100 Hz) returned to R1 (333 ± 29 vs. 324 ± 27 N), whereas force at low frequency (i.e., 10 Hz) was only partially ( P < 0.05) recovered (113 ± 12 vs. 70 ± 6.6 N). It is concluded that multiple sessions of heavy exercise can reverse the fatigue noted early and reduce or eliminate weakness depending on the frequency of stimulation.

Muscle function during repetitive moderate-intensity muscle contractions in myoadenylate deaminase-deficient Dutch subjects

2002 ◽  
Vol 102 (5) ◽  
pp. 531-539 ◽  
Author(s):  
C.J. DE RUITER ◽  
A.M. MAY ◽  
B.G.M. VAN ENGELEN ◽  
R.A. WEVERS ◽  
G.C. STEENBERGEN-SPANJERS ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Exercise Test ◽  
Muscle Contractions ◽  
Moderate Intensity ◽  
Control Subjects ◽  
Generating Capacity ◽  
Myoadenylate Deaminase ◽  
Baseline Values ◽  
Isometric Muscle ◽  
Femoris Muscle

We investigated whether the capacity for repetitive submaximal muscle contraction was reduced in a group of subjects (n = 8) with a primary deficiency of myoadenylate deaminase (MAD). Quadriceps femoris muscle fatigue was evaluated using voluntary and electrically stimulated contractions during 20min of repetitive voluntary isometric contractions at 40% of maximal force-generating capacity (MFGC). After 5min of exercise, MFGC had declined significantly to 70.6±4.1% (mean±S.E.M.) and 87.2±1.6% of baseline values in MAD-deficient and sedentary control subjects (n = 8) respectively (P = 0.002 between groups). After 5min of exercise, the half-relaxation time had increased significantly to 113.4±6.1% of basline in MAD-deficient muscle, but had decreased significantly to 94.1±1.3% in control subjects (P = 0.003 between groups). All control subjects completed the 20-min exercise test. Five of the MAD-deficient subjects had to stop exercising due to early muscle fatigue; however, three of the MAD-deficient subjects were able to complete the 20-min exercise test. In conclusion, although the capacity for repetitive submaximal isometric muscle contractions for the group of MAD-deficient subjects was significantly decreased, it remains uncertain whether MAD deficiency is the sole cause of pronounced muscle fatigue.

scholarly journals Effects of stimulation frequency versus pulse duration modulation on muscle fatigue

2008 ◽  
Vol 18 (4) ◽  
pp. 662-671 ◽  
Author(s):  
Trisha Kesar ◽  
Li-Wei Chou ◽  
Stuart A. Binder-Macleod
Keyword(s):  
Muscle Fatigue ◽  
Pulse Duration ◽  
Stimulation Frequency

“Measurement of Muscle Fatigue Using Electromyography”

1975 ◽  
Vol 19 (4) ◽  
pp. 403-414
Author(s):  
M.M. Ayoub ◽  
H.F. Martz ◽  
TX Ching H. Wu
Keyword(s):  
Muscle Strength ◽  
Muscle Fatigue ◽  
Dynamic Loading ◽  
Predictive Models ◽  
Muscle Action ◽  
Biceps Muscle ◽  
Muscle Action Potential ◽  
Signal Characteristics ◽  
Static And Dynamic Loading ◽  
Isometric Muscle

This paper summarizes research project which investigated the signal characteristics of muscle action potential when the muscle is fatigued and evaluated these characteristics as a measure of muscle fatigue. Eight subjects participated in the study under conditions of static and dynamic loading of the biceps muscle. The level of loading varied as a percent of maximum isometric muscle strength. The paper presents a criteria which defines muscle fatigue and discusses predictive models for muscle fatigue using this criteria for both static and dynamic loading.

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