Reliability of the log‐transformed EMG amplitude‐power output relationship for incremental knee‐extensor ergometry

Eason, Travis; Gavel, Christine R.; Hawley, Kyle A.; Galen, Sujay; Malek, Moh H.

doi:10.1002/mus.24561

Cited by 14 publications

(54 citation statements)

References 29 publications

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“…The investigator concluded that the rectus femoris during walking was active during the stance-to-swing transition, but that as the pace increased, the EMG activity increased during the swing-to-stance transition (29). The exercise mode used in current study is the single-leg knee-extensor ergometry, which isolates the quadriceps femoris muscles while concomitantly minimizing cardiovascular and respiratory responses to exercise (9,13,24,25,32). Moreover, Richardson et al (32) reported that the rectus femoris muscle had the highest activation compared with the vastus lateralis, vastus medialis, and vastus intermedius muscles for single-leg knee-extensor ergometry.…”

Section: Discussionmentioning

confidence: 98%

“…Incremental Single-Leg Knee-Extensor. The single-leg kneeextensor ergometry has been used previously in our laboratory (9,13,24,25,32) and exclusively focuses the exercise demand on the quadriceps femoris muscles (32). Briefly, each participant was semirecumbent in an adjustable chair with a special ankle boot placed on the nondominant leg and connected by a bar to the ergometer.…”

Section: Methodsmentioning

confidence: 99%

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Pre-exhaustion Exercise Differentially Influences Neuromuscular Fatigue Based on Habitual Physical Activity History

Harlan

Merucci

Weaver

et al. 2021

Journal of Strength and Conditioning Research

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Pre-exhaustion exercise differentially influences neuromuscular fatigue based on habitual physical activity history. J Strength Cond Res XX(X): 000-000, 2018-Although there is anecdotal evidence of a potential physiological benefit of preexhaustion exercise to enhance muscular recruitment, few studies have systematically examined the effect on neuromuscular activity. Moreover, a subject's habitual physical activity history may, in part, contribute to the muscle's response on a subsequent workbout after a single pre-exhaustion workbout. To date, no studies have examined the effect of pre-exhaustion exercise on the electromyographic fatigue threshold (EMG FT). The purpose of this study, therefore, is to determine whether pre-exhaustion exercise influences the EMG FT. Specifically, we were interested in determining whether or not there is a dichotomous response to pre-exhaustion exercise based on the individual's habitual physical activity history. Thus, we hypothesized that healthy active subjects would have reduced EMG FT values, whereas elite runners would have increased EMG FT values as a result of the pre-exhaustion exercise. Eight healthy college-aged men (mean 6 SEM, age = 24.5 6 0.3 years; body mass = 83.1 6 3.0 kg; and height = 1.80 6 0.02 m) and 9 elite runners (mean 6 SEM, age = 23.4 6 0.7 years; body mass = 70.3 6 2.7 kg; and height = 1.79 6 0.03 m) participated in current study. Each subject visited the laboratory on 2 occasions separated by 7 days and performed the single-leg knee-extensor ergometry test. For one of the visits, the subjects performed the Thorstensson test (50 continuous, concentric knee extensions) before the single-leg kneeextensor ergometry. The EMG FT was measured on both visits for all subjects. For healthy subjects, we found that the EMG FT was significantly reduced after performing the 50 isokinetic knee extensions (control: 27 6 6 W vs. Thorstensson: 21 6 6.0 W; p = 0.001), whereas for elite runners, there was no significant mean differences between the 2 visits (control: 38 6 3 W vs. Thorstensson: 39 6 2 W; p = 0.813). These results suggest that 50 repetition of isokinetic muscle action, as a method of pre-existing the quadriceps femoris muscles, may be influenced by the subject's habitual exercise history.

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Section: Discussionmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Pre-exhaustion Exercise Differentially Influences Neuromuscular Fatigue Based on Habitual Physical Activity History

Harlan

Merucci

Weaver

et al. 2021

Journal of Strength and Conditioning Research

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“…In muscle work, during the swing period, activation and contraction of the gastrocnemius muscle causes the calf to flex at the knee joint, which is crucial for movement completion (Prateepavanich et al ., 1999). There is a good linear relationship between the muscle contractility or output power changes and EMG signal amplitude under various muscle‐loading forms (Eason et al ., 2015). ID children's left‐leg gastrocnemius EMG value was significantly lower than TD children, indicating non‐development of a complete gait pattern and a lack of ground thrusting and also unbalanced development of the lower limb gastrocnemius muscle, resulting in a lack of coordination on both sides (Donath et al ., 2016).…”

Section: Discussionmentioning

confidence: 99%

Biomechanical analysis of gait patterns in children with intellectual disabilities

Zhang

et al. 2021

J intellect Disabil Res

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Background Children with intellectual disabilities (ID) typically master walking skills much later than typically developing (TD) children and have poor postural control ability. This study aimed to explore the gait ability and characteristics of children with ID and whether there is any difference in walking ability between them and TD children. Method In this study, integrating kinematic–biomechanic–dynamic measurement methods and corresponding analysis methods (video analysis, three‐dimensional force analysis and electromyography test analysis) were used to characterise and compare the gait patterns between ID children and TD children. Results ID children's step length/leg length ratio was lower than TD children. The left‐leg single‐leg support time and step length of ID children were shorter than TD children. While walking, ID children touched the ground with the whole foot pad and could not powerfully thrust against the ground with their toes. Their left legs had obvious disadvantages compared with their right legs. ID children's lower limb muscle strength was lower than TD children, and their thigh muscles had an obvious compensation function. Conclusions Correcting ID children's gait should be an important teaching goal for physical education institutors and teachers. Muscle‐strength and flexibility training can help ID children reinforce core strength and better coordinate lower limbs.

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“…where the exponent Y is equal to the predicted EMG amplitude, X is the power output, and b is the slope of the logtransformed equation (5,12,25,34). Therefore, using equation 2, values such as the coefficient of determination (R 2 ), slope, and yintercept were calculated on a subject-by-subject basis.…”

Section: Statistical Analysesmentioning

confidence: 99%

Log-Transformed Electromyography Amplitude Power Output Relationship: Nondominant vs. Dominant Limb

Boccomino

Daoud

Hudas

et al. 2022

Journal of Strength and Conditioning Research

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Boccomino, HL, Daoud, BT, Hudas, A, North, WA, and Malek, MH. Log-transformed electromyography amplitude power output relationship: nondominant vs. dominant limb. J Strength Cond Res 36(3): 851-856, 2022-Findings from studies that examine bilateral differences between the nondominant and dominant limb during whole-body (i.e., cycle ergometry) are equivocal. This may, in part, be because of the mode of exercise (i.e., whole-body) and how the data are analyzed. Surface electromyography (EMG) is a noninvasive method of examining motor unit recruitment and activation during exercise. The log-transformed electromyography amplitude power output relationship provides y-intercept and slope terms on a subject-by-subject basis that can therefore be statistically analyzed. The purpose of this study, therefore, was to identify potential differences in the muscle for the nondominant and dominant limb using the log-transformed EMG amplitude power output relationship for continuous exercise that isolates the quadricep femoris muscles. Nine healthy college-aged men (mean 6 SEM: age, 22.6 6 1.2 years; mass, 68.6 6 10.4 kg; and height, 1.76 6 0.03 m) volunteered as subjects for the current study. Each subject visited the laboratory on a single occasion, had EMG electrodes placed on their rectus femoris muscle for their nondominant and dominant limb, and performed an incremental double-leg knee-extensor ergometry to voluntary exhaustion. The subjects achieved a mean power output (75 6 8 W) for the exercise test. In addition, a mean end-exercise heart rate (155 6 8 b•min 21 ) corresponded to 79 6 4% of the age-predicted heart rate using the formula 220-age. Separate paired t tests for the slope (t[8] 5 0.929 p 5 0.38) and y-intercept (t[8] 5 0.368, p 5 0.72) terms revealed no significant mean differences between the 2 limbs. The results of the present study indicate that there are no differences in muscle activation between the nondominant and dominant limbs for continuous exercise that isolates the muscle.

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Reliability of the log‐transformed EMG amplitude‐power output relationship for incremental knee‐extensor ergometry

Abstract: The log-transformed EMG amplitude-power output relationship is a reliable index for measuring motor unit activation.

Cited by 14 publications

References 29 publications

Pre-exhaustion Exercise Differentially Influences Neuromuscular Fatigue Based on Habitual Physical Activity History

Pre-exhaustion Exercise Differentially Influences Neuromuscular Fatigue Based on Habitual Physical Activity History

Biomechanical analysis of gait patterns in children with intellectual disabilities

Log-Transformed Electromyography Amplitude Power Output Relationship: Nondominant vs. Dominant Limb

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