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Perceptual, mechanical and electromyographic responses to different relative loads in the parallel squat

Perceptual, mechanical and electromyographic responses to different relative loads in the parallel squat

Chapman, Mark, Larumbe-Zabala, Eneko, Goss-Sampson, Mark, Colpus, Mark, Triplett, N. Travis and Naclerio, Fernando ORCID: 0000-0001-7405-4894 (2017) Perceptual, mechanical and electromyographic responses to different relative loads in the parallel squat. Journal of Strength and Conditioning Research. ISSN 1064-8011 (Print), 1533-4287 (Online) (doi:10.1519/JSC.0000000000001867)

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Abstract

The effectiveness of the OMNI-RES (0-10) and the electromyographic signal for monitoring changes in the movement velocity was examined during a set to muscular failure using different percentages of one repetition maximum (1RM) in the parallel squat exercise (PSQ). Twelve males (26.3 ± 5.8 years) were evaluated on eight separate days with 48 hours of rest between sessions. After determining the 1RM value, participants underwent seven tests until achieving muscular failure with the following percentage ranges: 30 to <40%; 40 to <50%, 50 to <60%, 60% to <70%, 70 to <80%, 80 to <90% and >90%. An optical rotary encoder measured mean accelerative velocity (MAV) and the OMNI-RES (0-10) scale was used to express the Rating of Perceived Exertion (RPE) after every repetition of each set. Additionally, the normalized root mean square (RMS) signal of the surface electromyography (N-EMG) was calculated for the vastus medialis muscle. The RPE expressed after the first repetition and when the maximum value of MAV was achieved along the sets was lower (p <0.001, d >0.8) than the RPE that corresponded to a 10% drop in MAV and at failure. Additionally, the initial RPE was useful to distinguish different loading zones by anchoring the OMNI-RES value to the magnitude of the relative load (<60%, 60 to <70% or ≤ 70% 1RM). Similar patterns were observed using the N-EMG. In conclusion, apart from differentiating between relative loads during a set to failure in the PSQ, the RPE and the N-EMG can both reflect changes associated with the initial, maximal, 10% drop in movement velocity and the muscular failure.

Item Type: Article
Uncontrolled Keywords: RPE; OMNI-RES (0-10) scale; Accelerative velocity; Muscular failure; EMG; Neuromuscular activity
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Centre for Science and Medicine in Sport and Exercise
Faculty of Engineering & Science > Department of Life & Sports Sciences
Related URLs:
Last Modified: 24 Mar 2018 01:38
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/16320

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