Electromyography and high-speed elbow flexor exercise

Davidson, Mark E.; Shepherd, Catherine; Biga, James; Davison, Steve; Giebel, Rachel; Charles, Jessica; Learmonth, Lexis; Caruso, John F.

doi:10.3233/ies-130490

Cited by 2 publications

(3 citation statements)

References 23 publications

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“…Recent work on the required number of familiarization sessions examined exercises less rigorous than the squat, and included dependent variables, such as subjects' 1RM values, which tend to exhibit less variability than our study's performance-based dependent variables, which is in part due to the speed at which repetitions are performed. Current study repetitions occurred at faster velocities than are generally seen with 1RM attempts, which lead to higher rates of movement and more data variability (Caruso et al, 2013;Caruso et al, 2012;Davidson et al, 2013). In exercise studies with low rigor (e.g., vertical jump, isometric contractions, and elastic band exercise), familiarization occurred with a single session administered prior to actual test data collection (Calder and Gabriel, 2007;Colado et al, 2014;Frost et al, 2012), or no familiarization whatsoever for vertical jumps done by physically active men (Moir et al, 2004).…”

Section: Discussionmentioning

confidence: 89%

“…Most outliers were peak power and peak EMG values produced from the exoskeleton workout; such instantaneous measurements are more prone to elicit outliers than dependent variables that exhibit more stability over time (Caruso et al, 2013;Davidson et al, 2013). EMG, in particular, is a very sensitive measure; despite the similarity of interworkout EMG preparations to our subjects' left legs, which included replication of electrode placement over a marked skin site, there is inherently high variability when such data is obtained from dynamic exercise (Davidson et al, 2013). Table 3 and Table 4 each include a column that displays the number of subjects who provided data (with outliers and corresponding values excluded) per dependent variable.…”

Section: Resultsmentioning

confidence: 99%

“…The achievement of comparatively similar data from both of our workouts was made difficult by numerous factors inherent to the current study. They include performance of a multi-joint, multi-planar movement at relatively high velocities with a novel exoskeleton (Caruso et al, 2013;Caruso et al, 2012;Davidson et al, 2013). Yet the low degree of comparative similarity, as seen in some Table 3 and Table 4 results, is still disconcerting and the reason we did not address our study hypothesis.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative Responses to Squats Completed with Free Weights and an Exoskeleton

Neuhaus

Jumonville

Perry

et al. 2016

Gravitational and Space Research

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To assess the comparative similarity of squat data collected as they wore a robotic exoskeleton, female athletes (n=14) did two exercise bouts spaced 14 days apart. Data from their exoskeleton workout was compared to a session they did with free weights. Each squat workout entailed a four-set, four-repetition paradigm with 60-second rest periods. Sets for each workout involved progressively heavier (22.5, 34, 45.5, 57 kg) loads. The same physiological, perceptual, and exercise performance dependent variables were measured and collected from both workouts. Per dependent variable, Pearson correlation coefficients, t-tests, and Cohen's d effect size compared the degree of similarity between values obtained from the exoskeleton and free weight workouts. Results show peak O2, heart rate, and peak force data produced the least variability. In contrast, far more inter-workout variability was noted for peak velocity, peak power, and electromyography (EMG) values. Overall, an insufficient amount of comparative similarity exists for data collected from both workouts. Due to the limited data similarity, the exoskeleton does not exhibit an acceptable degree of validity. Likely the cause for the limited similarity was due to the brief amount of familiarization subjects had to the exoskeleton prior to actual data collection. A familiarization session that accustomed subjects to squats done with the exoskeleton prior to actual data collection may have considerably improved the validity of data obtained from that device.

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Section: Discussionmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Responses to Squats Completed with Free Weights and an Exoskeleton

Neuhaus

Jumonville

Perry

et al. 2016

Gravitational and Space Research

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Load-Power Relationships for High-Speed Knee Extension Exercise

Chen

Davison

Selimovic

et al. 2019

Journal of Strength and Conditioning Research

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Chen, L, Davison, SW, Selimovic, EA, Mueller, RE, Beatty, SR, Carter, KA, Parmar, PJ, Symons, TB, Pantalos, GM, and Caruso, JF. Load-power relationships for high-speed knee extension exercise. J Strength Cond Res 33(6): 1480–1487, 2019—Seventy subjects did 4 knee extensor workouts with their left legs to assess load-power relationships produced on a high-speed trainer (HST; Newnan, GA, USA). Each workout is composed of 4 sets done on the HST at a different load (1, 4.4, 6.7, 9 kg). A Latin Squares Design determined load sequence per workout. Average power (AP) and peak power (PP) and those same values normalized to body mass (BM) and fat-free mass (AP/BM, PP/BM, AP/FFM, PP/FFM) were each analyzed with 2 (gender) × 4 (load) analysis of variances, with repeated measures for load. We assessed relationships between normalized loads and AP and PP values with correlation coefficients. Average power results revealed a significant interaction, with men > women at 9 kg. Peak power/body mass also yielded an interaction, with women > men at 6.7 and 9 kg. Average power/fat-free mass and PP/FFM each produced interactions, with women > men at 4.4, 6.7, and 9 kg. Correlation coefficients showed significant (r = 0.80–0.82) relationships between normalized loads and AP and PP values. In conclusion, the very low inertial resistance to initiate each repetition on this novel device may in part explain our PP/BM, AP/FFM, PP/FFM results, in which higher values were achieved by women. Our practical applications imply that the low inertial resistance for HST repetitions negates male size and strength advantages typically seen when power is measured.

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Electromyography and high-speed elbow flexor exercise

Cited by 2 publications

References 23 publications

Comparative Responses to Squats Completed with Free Weights and an Exoskeleton

Comparative Responses to Squats Completed with Free Weights and an Exoskeleton

Load-Power Relationships for High-Speed Knee Extension Exercise

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