Test-retest reliability of the electromyographic fatigue threshold for cycle ergometry.

doi:10.1002/MUS.24915

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Test-retest reliability of the electromyographic fatigue threshold for cycle ergometry.

Journal Article•DOI•

Test-retest reliability of the electromyographic fatigue threshold for cycle ergometry.

Selim MahmutoviĆ¹, Erick Y. Sprout¹, John C. Fontaine¹, Travis M. Buskirk¹, Sujay Galen¹, Moh H. Malek¹ - Show less +2 more•Institutions (1)

Eugene Applebaum College of Pharmacy and Health Sciences¹

01 May 2016-Muscle & Nerve (John Wiley & Sons, Ltd)-Vol. 53, Iss: 5, pp 803-807

TL;DR: The reliability of the EMGFT for cycle ergometry is a reliable measure for assessing muscular fatigue and was in the “excellent” category.

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Abstract: INTRODUCTION The purpose of this study was to determine the intersession reliability of the electromyographic fatigue threshold (EMGFT ) for cycle ergometry. METHODS On separate occasions, 10 healthy, college-aged men performed an incremental test to voluntary exhaustion on a cycle ergometer. The EMG amplitude vs. time relationships for each power output from the quadriceps femoris muscles were analyzed using linear regression. EMGFT was defined operationally as the average of the highest power output that resulted in a non-significant slope coefficient (P > 0.05) and the lowest power output that resulted in a significant (P < 0.05) positive slope coefficient. The EMGFT values for trials 1 and 2 were used to calculate the intraclass correlation coefficient (ICC). RESULTS Overall, the reliability of the EMGFT (ICC2,1 = 0.85; 95% confidence interval 0.49-0.96) was in the "excellent" category. CONCLUSIONS The EMGFT for cycle ergometry is a reliable measure for assessing muscular fatigue.

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Journal Article•DOI•

Research methods in physical activity.

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Ronald J. Maughan¹•Institutions (1)

Loughborough University¹

01 Mar 2017-Journal of Sports Sciences

TL;DR: The first edition of this book appeared in 1985, and it seems remarkable that the two authors of that book were the same people as the authors of this paper as discussed by the authors, who published seven editions over a period of 30 years.

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Abstract: Any book that runs to seven editions over a period of 30 years must be doing something right. The first edition of this book appeared in 1985, and it seems remarkable that the two authors of that e...

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248 citations

Journal Article•DOI•

EMG amplitude, fatigue threshold, and time to task failure: A meta-analysis.

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J. Matt McCrary¹, J. Matt McCrary², Bronwen J. Ackermann², Mark Halaki²•Institutions (2)

University of New South Wales¹, University of Sydney²

01 Nov 2017-Journal of Science and Medicine in Sport

TL;DR: EMGFT lacks face validity as currently calculated; models for more precise EMGFT calculation are proposed and a new framework for prediction of task failure using EMG amplitude data alone is presented.

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18 citations

Journal Article•DOI•

Listening to Fast-Tempo Music Delays the Onset of Neuromuscular Fatigue

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Jacob Centala¹, Cameron Pogorel, Scott W. Pummill, Moh H. Malek•Institutions (1)

Wayne State University¹

01 Mar 2020-Journal of Strength and Conditioning Research

TL;DR: It is suggested that listening to fast-tempo music increased overall exercise tolerance as well as the neuromuscular fatigue threshold, applicable to both sport and rehabilitative settings.

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Abstract: Centala, J, Pogorel, C, Pummill, SW, and Malek, MH. Listening to fast-tempo music delays the onset of neuromuscular fatigue. J Strength Cond Res 34(3): 617-622, 2020-Studies determining the effect of music on physical performance have primarily focused on outcomes such as running time to exhaustion, blood lactate, or maximal oxygen uptake. The electromyographic fatigue threshold (EMGFT) is determined through a single incremental test and operationally defined as the highest exercise intensity that can be sustained indefinitely without an increase in EMG activity of the working muscle. To date, no studies have examined the role of fast-tempo music on EMGFT. The purpose of this investigation, therefore, was to determine whether fast-tempo music attenuates neuromuscular fatigue as measured by the EMGFT. We hypothesized that listening to fast-tempo music during exercise would increase the estimated EMGFT compared with the control condition. Secondarily, we hypothesized that maximal power output would also increase as a result of listening to fast-tempo music during the exercise workbout. Ten healthy college-aged men (mean ± SEM: age, 25.3 ± 0.8 years [range from 22 to 31 years]; body mass, 78.3 ± 1.8 kg; height: 1.77 ± 0.02 m) visited the laboratory on 2 occasions separated by 7 days. The EMGFT was determined from an incremental single-leg knee-extensor ergometer for each visit. In a randomized order, subjects either listened to music or no music for the 2 visits. All music was presented as instrumentals and randomized with a tempo ranging between 137 and 160 b·min. The results indicated that listening to fast-tempo music during exercise increased maximal power output (No Music: 48 ± 4; Music: 54 ± 3 W; p = 0.02) and EMGFT (No Music: 27 ± 3; Music: 34 ± 4 W; p = 0.008). There were, however, no significant mean differences between the 2 conditions (no music vs. music) for absolute and relative end-exercise heart rate as well as end-exercise rating of perceived exertion for the exercised leg. These findings suggest that listening to fast-tempo music increased overall exercise tolerance as well as the neuromuscular fatigue threshold. The results are applicable to both sport and rehabilitative settings.

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18 citations

Cites background from "Test-retest reliability of the elec..."

...It has been shown that the EMGFT is a highly reliable measure (24)....
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Journal Article•DOI•

Reduced Electromyographic Fatigue Threshold After Performing a Cognitive Fatiguing Task.

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Justine R Ferris¹, Mary A Tomlinson¹, Tayler N Ward¹, Marie E. Pepin¹, Moh H. Malek¹ - Show less +1 more•Institutions (1)

Eugene Applebaum College of Pharmacy and Health Sciences¹

01 Jan 2021-Journal of Strength and Conditioning Research

TL;DR: Performing the cognitive fatiguing task reduces the EMGFT with a corresponding reduction in maximal heart rate response, suggesting that cognitive fatigue tasks performed prior to exercise reduce exercise capacity.

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Abstract: Cognitive fatigue tasks performed before exercise may reduce exercise capacity. The electromyographic fatigue threshold (EMGFT) is the highest exercise intensity that can be maintained without significant increase in the electromyography (EMG) amplitude vs. time relationship. To date, no studies have examined the effect of cognitive fatigue on the estimation of the EMGFT. The purpose of this study, therefore, was to determine whether cognitive fatigue before performing exercise reduces the estimated EMGFT. Eight healthy college-aged men were recruited from a university student population and visited the laboratory on multiple occasions. In a randomized order, subjects performed either the cognitive fatigue task (AX continuous performance test) for 60 minutes on one visit (experimental condition) or watched a video on trains for 60 minutes on the other visit (control condition). After each condition, subjects performed the incremental single-leg knee-extensor ergometry test while the EMG amplitude was recorded from the rectus femoris muscle and heart rate was monitored throughout. Thereafter, the EMGFT was calculated for each subject for each visit and compared using paired samples t-test. For exercise outcomes, there were no significant mean differences for maximal power output between the 2 conditions (control: 51 +/- 5 vs. fatigue: 50 +/- 3 W), but there was a significant decrease in EMGFT between the 2 conditions (control: 31 +/- 3 vs. fatigue: 24 +/- 2 W; p = 0.013). Moreover, maximal heart rate was significantly different between the 2 conditions (control: 151 +/- 5 vs. fatigue: 132 +/- 6; p = 0.027). These results suggest that performing the cognitive fatiguing task reduces the EMGFT with a corresponding reduction in maximal heart rate response.

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8 citations

Cites background or result from "Test-retest reliability of the elec..."

...Consistent with previous studies (3,10,11,19,24), the EMG signal before and after the contraction was analyzed to determine if interelectrode impedance was below 2,000 ohms....
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...85) (19) and influenced by caffeine supplementation (24)....
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...Studies have reported that the EMGFT for cycle ergometry (5,19) range between ;63 and ;69% of the maximal power output, which is indicative of submaximal exercise intensity....
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...Moreover, it has been shown that the EMGFT is a highly reliable measure (19)....
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...The electrodes were placed at 50% the distance between the anterior superior iliac spine and the superior border of the patella (3,10,11,14,19,24)....
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Journal Article•DOI•

Acute Low-Dose Caffeine Supplementation Increases Electromyographic Fatigue Threshold in Healthy Men

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Jacob J. Morse¹, Gramos Pallaska¹, Patrick R. Pierce², Travis M. Fields², Sujay S. Galen³, Moh H. Malek³ - Show less +2 more•Institutions (3)

Eugene Applebaum College of Pharmacy and Health Sciences¹, Wayne State University², American Physical Therapy Association³

01 Nov 2016-Journal of Strength and Conditioning Research

TL;DR: Findings suggest that acute low-dose caffeine supplementation delays neuromuscular fatigue in the quadriceps femoris muscles.

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Abstract: Morse, JJ, Pallaska, G, Pierce, PR, Fields, TM, Galen, SS, and Malek, MH. Acute low-dose caffeine supplementation increases electromyographic fatigue threshold in healthy men. J Strength Cond Res 30(11): 3236-3241, 2016-The purpose of this study is to determine whether consumption of a single low-dose caffeine drink will delay the onset of the electromyographic fatigue threshold (EMGFT) in the superficial quadriceps femoris muscles. We hypothesize that the EMGFT values for the caffeine condition will be significantly higher than the EMGFT values for the placebo condition. On separate occasions, 10 physically active men performed incremental single-leg knee-extensor ergometry 1 hour after caffeine (200 mg) or placebo consumption. The EMGFT was determined for each participant for both conditions. The results indicated a significant increase for maximal power output (16%; p = 0.004) and EMGFT (45%; p = 0.004) in the caffeine condition compared with placebo. These findings suggest that acute low-dose caffeine supplementation delays neuromuscular fatigue in the quadriceps femoris muscles.

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7 citations

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TL;DR: In this article, the authors present guidelines for choosing among six different forms of the intraclass correlation for reliability studies in which n target are rated by k judges, and the confidence intervals for each of the forms are reviewed.

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Abstract: Reliability coefficients often take the form of intraclass correlation coefficients. In this article, guidelines are given for choosing among six different forms of the intraclass correlation for reliability studies in which n target are rated by k judges. Relevant to the choice of the coefficient are the appropriate statistical model for the reliability and the application to be made of the reliability results. Confidence intervals for each of the forms are reviewed.

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21,185 citations

"Test-retest reliability of the elec..." refers background in this paper

...In addition to the ICC, another commonly reported statistic is the standard error of measurement (SEM), which indicates the expected trial-to-trial noise for the variable of interest.(15,16) Both ICC and SEM are important indices, because they provide a measure of stability for the desired variable as well as the error associated with that variable....
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...The ICC is interpreted as a measure of variance attributed to the target being measured.(14,15) Therefore, the target may be endurance athletes, cardiac patients, or rats, whereas the measurement may be time to exhaustion, EMG amplitude, or peak torque....
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Journal Article•DOI•

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TL;DR: A review of the distinction between various forms of intraclass correlation coefficients (ICC) can be found in this article, followed by a discussion of the relationship between the two types of ICCs.

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Abstract: Although intraclass correlation coefficients (ICCs) are commonly used in behavioral measurement, psychometrics, and behavioral genetics, procedures available for forming inferences about ICCs are not widely known. Following a review of the distinction between various forms of the ICC, this article p

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5,858 citations

"Test-retest reliability of the elec..." refers background in this paper

...The ICC is interpreted as a measure of variance attributed to the target being measured.(14,15) Therefore, the target may be endurance athletes, cardiac patients, or rats, whereas the measurement may be time to exhaustion, EMG amplitude, or peak torque....
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"Test-retest reliability of the elec..." refers background or methods in this paper

...The electrodes for the VL were placed over the lateral portion of the muscle approximately two-thirds the distance from the head of the greater trochanter and the lateral condyle of the femur.(17) For the RF, the electrodes were placed at one-half the distance from the inguinal crease and the superior border of the patella....
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...The electrode placement for the VM was one-fifth of the distance between the medial gap of the knee joint and the anterior superior iliac spine of the pelvis.(17) The shaved skin at each electrode site was abraded carefully, cleaned with alcohol, and interelectrode impedance was kept at <2,000 X....
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..., Santa Barbara, California) placed on the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM) muscles using standard guidelines.(17) The electrodes for the VL were placed over the lateral portion of the muscle approximately two-thirds the distance from the head of the greater trochanter and the lateral condyle of the femur....
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...For the RF, the electrodes were placed at one-half the distance from the inguinal crease and the superior border of the patella.(17) The electrode placement for the VM was one-fifth of the distance between the medial gap of the knee joint and the anterior superior iliac spine of the pelvis....
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