Evaluation of Central and Peripheral Fatigue in the Quadriceps Using Fractal Dimension and Conduction Velocity in Young Females

Beretta-Piccoli, Matteo; D’Antona, Giuseppe; Barbero, Marco; Fisher, Beth E.; Dieli‐Conwright, Christina M.; Clijsen, Ron; Cescon, Corrado

doi:10.1371/journal.pone.0123921

Cited by 67 publications

(58 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These data, although in contrast with the presence of larger sized fibers in males than in females, agree with previous results obtained in our laboratory in vastus lateralis muscle [25] and may be explained considering that initial values of EMG variable estimates are not only related to the recruited MU pool, but are also affected by factors such as subcutaneous tissue thickness, skinfold thickness and fiber end effects [49,50]. Confirming to previously published data [51], we found that female biceps brachii was surmounted by a thicker skinfold than male one, probably causing overestimation of CV.…”

Section: Discussionsupporting

confidence: 93%

“…FD : As previously reported, an increase in MU synchronization may be observed during fatiguing isometric contractions at 25% MVC or higher [11,25,26,61–65]. …”

Section: Discussionsupporting

confidence: 51%

“…We recently reported that a decay of FD during sustained fatiguing isometric contractions of the quadriceps muscles may mirror a progressive MU synchronization due to central fatigue [24] in young females [25]. Indeed, Boccia and colleagues (2016) reported a steeper rate of change of FD in elderly males compared to young males during fatiguing contractions of the knee extensors suggesting a greater increase in motor unit synchronization with age [26].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inter-Gender sEMG Evaluation of Central and Peripheral Fatigue in Biceps Brachii of Young Healthy Subjects

et al. 2016

Self Cite

View full text Add to dashboard Cite

PurposeThe purpose of the present study was to evaluate inter-arm and inter-gender differences in fractal dimension (FD) and conduction velocity (CV) obtained from multichannel surface electromyographic (sEMG) recordings during sustained fatiguing contractions of the biceps brachii.MethodsA total of 20 recreationally active males (24±6 years) and 18 recreationally active females (22±9 years) performed two isometric contractions at 120 degrees elbow joint angle: (1) at 20% maximal voluntary contraction (MVC) for 90 s, and (2) at 60% MVC until exhaustion the time to perform the task has been measured. Signals from sEMG were detected from the biceps brachii using bidimensional arrays of 64 electrodes and initial values and rate of change of CV and FD of the sEMG signal were calculated.ResultsNo difference between left and right sides and no statistically significant interaction effect of sides with gender were found for all parameters measured. A significant inter-gender difference was found for MVC (p<0.0001). Initial values of CV were higher in females than in males at both force levels (20% MCV: p<0.0001; 60% MCV: p<0.05) whereas a lower initial estimate of FD was observed in females compared to males (20% MCV: p<0.05; 60% MCV: p<0.0001). No difference in CV and FD slopes was found at 20% MVC between genders. At 60% MVC significantly lower CV and FD slopes (CV and FD: p<0.05) and a more protracted time to exhaustion were found in females than in males (p<0.0001). When considering time to exhaustion at both levels of contraction no difference in percentage change (Δ%) of CV and FD slopes was found between genders (p>0.05). During the sustained 60% MVC no statistical correlation was found between MVC and CV or FD initial estimates nor between MVC and CV or FD slopes both in males and females whereas. A significant positive correlation between CV and FD slopes was found in both genders (males: r = 0,61; females: r = 0,55).ConclusionsFatigue determines changes in FD and CV values in biceps brachii during sustained contractions at 60% MVC. In particular males show greater increase in the rate of change of CV and FD than females whereas no difference in percentage change of these sEMG descriptors of fatigue was found. A significant correlation between FD and CV slopes found in both genders highlights that central and peripheral myoelectric components of fatigue may interact during submaximal isometric contractions.

show abstract

Section: Discussionsupporting

confidence: 93%

“…FD : As previously reported, an increase in MU synchronization may be observed during fatiguing isometric contractions at 25% MVC or higher [11,25,26,61–65]. …”

Section: Discussionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inter-Gender sEMG Evaluation of Central and Peripheral Fatigue in Biceps Brachii of Young Healthy Subjects

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…This means that parameters which could describe the MUs synchronization well would be suitable for muscle fatigue assessment. Exactly, HFD was proved to be one of those parameters [35][36][37]. In addition, Troiano et al found that the fractal dimension of SEMG was not affected by force level during non-fatiguing contractions but decreased against time during fatiguing contractions [30].…”

Section: The Performance In Quantification Of Fatigue For Different Smentioning

confidence: 99%

“…In fact, muscle fatigue can be divided into central and peripheral fatigue according to its origin [36]. "Central fatigue" is related to a decline of motor drive, MUs synchronization, and the variations in control strategy of the CNS.…”

Section: Possible Reasons For the Differences Of The Fatiguing Characmentioning

confidence: 99%

Muscle Fatigue Analysis of the Deltoid during Three Head-Related Static Isometric Contraction Tasks

Cui

Chen

Cao

et al. 2017

Entropy

View full text Add to dashboard Cite

This study aimed to investigate the fatiguing characteristics of muscle-tendon units (MTUs) within skeletal muscles during static isometric contraction tasks. The deltoid was selected as the target muscle and three head-related static isometric contraction tasks were designed to activate three heads of the deltoid in different modes. Nine male subjects participated in this study. Surface electromyography (SEMG) signals were collected synchronously from the three heads of the deltoid. The performances of five SEMG parameters, including root mean square (RMS), mean power frequency (MPF), the first coefficient of autoregressive model (ARC1), sample entropy (SE) and Higuchi's fractal dimension (HFD), in quantification of fatigue, were evaluated in terms of sensitivity to variability ratio (SVR) and consistency firstly. Then, the HFD parameter was selected as the fatigue index for further muscle fatigue analysis. The experimental results demonstrated that the three deltoid heads presented different activation modes during three head-related fatiguing contractions. The fatiguing characteristics of the three heads were found to be task-dependent, and the heads kept in a relatively high activation level were more prone to fatigue. In addition, the differences in fatiguing rate between heads increased with the increase in load. The findings of this study can be helpful in better understanding the underlying neuromuscular control strategies of the central nervous system (CNS). Based on the results of this study, the CNS was thought to control the contraction of the deltoid by taking the three heads as functional units, but a certain synergy among heads might also exist to accomplish a contraction task.

show abstract

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

et al. 2017

View full text Add to dashboard Cite

show abstract

Evaluation of Central and Peripheral Fatigue in the Quadriceps Using Fractal Dimension and Conduction Velocity in Young Females

Cited by 67 publications

References 85 publications

Inter-Gender sEMG Evaluation of Central and Peripheral Fatigue in Biceps Brachii of Young Healthy Subjects

Inter-Gender sEMG Evaluation of Central and Peripheral Fatigue in Biceps Brachii of Young Healthy Subjects

Muscle Fatigue Analysis of the Deltoid during Three Head-Related Static Isometric Contraction Tasks

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

Contact Info

Product

Resources

About