Reliability of normalized surface electromyographic signals of maximal upper-body isokinetic strength

Rocha-Junior, Valdinar A.; Bottaro, Martim; Pereira, Maria C.; Júnior, João Batista Ferreira; Carmo, João dos Santos; Brown, Lee E.; Nascimento, Francisco Assis de Oliveira

doi:10.3233/ies-140558

Cited by 3 publications

(2 citation statements)

References 52 publications

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“…In particular, the overall activation degree of neck flexor and extensor muscles with the OHT (45.42%) was almost twice as much as that of gravitational one-way trainers HATT (25.62%) or TWT (26.14%) during rapid movement. Previous studies had pointed out that the size of the RMS of sEMG was determined by the combination of the recruitment of motor unit and muscle fiber action potential discharge during muscle contraction [38,39]. The level of muscle fiber action potential discharge increased, and more motor units recruited made muscles increase strength output in order to maintain a faster speed of movement.…”

Section: The Muscle Activation Intensitymentioning

confidence: 99%

An Evaluation Study of a New Designed Oscillating Hydraulic Trainer of Neck

et al. 2023

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In view of the importance of neck strength training and the lack of adequate training equipment, this study designed a new oscillating hydraulic trainer (OHT) of neck based on oscillating hydraulic damper. We used surface electromyography (sEMG) and subjective ratings to evaluate the neck OHT and compared the results with a simple hat trainer (HATT) and traditional weight trainer (TWT) to verify the feasibility and validity of the OHT. Under similar exercise conditions, 12 subjects performed a set of neck flexion and extension exercise with these 3 trainers. The sEMG signals of targeted muscles were collected in real time, and subjects were asked to complete subjective evaluations of product usability after exercise. The results showed that the root mean square (RMS%) of sEMG indicated that the OHT could provide two-way resistance and train the flexors and extensors simultaneously. The overall degree of muscle activation with OHT was higher than that with the other two trainers in one movement cycle. In terms of resistance characteristics exhibited by the sEMG waveform, duration (D) with OHT was significantly longer than HATT and TWT when exercising at a high speed, while Peak Timing (PT) was later. The ratings of product usability and performing usability of OHT were remarkably higher than that of HATT and TWT. Based on the above results, the OHT was proved to be more suitable for strength training, such as neck muscles, which were getting more attention gradually, but lacked mature and special training equipment.

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Section: The Muscle Activation Intensitymentioning

confidence: 99%

An Evaluation Study of a New Designed Oscillating Hydraulic Trainer of Neck

et al. 2023

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“…Recently, surface electromyography (EMG) has been widely applied to investigate and evaluate muscle activity/adaptation (Beck et al, 2012; Camic et al, 2013; Gabriel et al, 2007; Rocha-Júnior et al, 2015). The time domains of the EMG signal reflect the changes in electrical activity and motor unit recruitment during muscle contraction, which are generally regarded to be sensitive for investigating the changes in motor control patterns in movement tasks and interface/shoe configurations (Basmajian and DeLuca, 1985).…”

Section: Introductionmentioning

confidence: 99%

Changes in Impact Signals and Muscle Activity in Response to Different Shoe and Landing Conditions

Wang

Zhang

2017

Journal of Human Kinetics

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Few rigorous scientific studies have investigated how the corresponding neuromuscular activity in the lower extremity occurs during different landing control movements in response to different impact signals. This study aimed to determine the potential shoe effects on impact signals, neuromuscular responses and their possible interactions in different human landing movements. Twelve male basketball players were required to wear high-cushioned basketball shoes (BS) and minimally cushioned control shoes (CC) to perform active drop jump landings (DJL) and passive landings (PL). Ground reaction forces and EMG amplitude (root mean square, EMGRMS) of the leg muscles within 50 ms before and after the landing movements were collected simultaneously. No shoe effect was found on the characteristics of impact signals and neuromuscular activity during the contact phase of DJL. By contrast, for PL, the values of maximal ground reaction force and the peak loading rate were evidently lower in the BS condition than in the CC condition (p < 0.05). Meanwhile, the EMGRMS of all muscles demonstrated a significant decrease in the BS condition compared with the CC condition within 50 ms after contact (p < 0.05). These findings suggest that under the condition in which related muscles are activated improperly, a neuromuscular adaptation occurs in response to different impact signals. Key words: vertical ground reaction force; EMG amplitude; drop landing. IntroductionDuring two-footed landings from vertical jumps, the peak magnitude of vertical reaction forces has been found to range from 3.5 to 6 times BW (Gross and Nelson, 1988). Previous investigations reported a close relationship between the great shock in strenuous landings and lower-limb injuries, that is, repetitive excessive loading can induce acute injuries (Beynnon et al., 2005;McNitt-Gray, 1993) and overuse damages (Agel et al., 2007;Borowski et al., 2008). Thus, to prevent sports injuries in athletic activities, footwear manufacturers have been focusing on designing shoes that can attenuate a shock wave, and thus the concept of cushioning has been widely used since the 1970s (Clarke et al., 1983).Current investigations into impact forces have focused not only on the magnitude, timing and the loading rate, but also on the reactions and muscular responses of the musculoskeletal system (Brüggemann et al., 2011). A series of concepts about the effects of impacts has been provided during the past ten years (Boyer and Nigg, 2007;Nigg and Wakeling, 2001). Impacts are regarded as input signals into the human locomotor system, which produce a shock wave and meantime initiate the vibrations of lower extremity soft tissues. These signals are sensed and the central nervous system responds by adjusting, if necessary, the activation of the relevant major muscle groups (Nigg and Wakeling, 2001 (Frederick and Hagy, 1986;Hamill et al., 1983), different lower limb postures (Derrick et al., 2002), and/or the hardness (or material) of the shoe midsole (Clarke et al., 1983). Theoretically, dif...

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Compression apparel does not have an acute effect on quadriceps strength but is associated with changes in muscle activation patterns

Zhang

Xia

et al. 2016

IES

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Reliability of normalized surface electromyographic signals of maximal upper-body isokinetic strength

Cited by 3 publications

References 52 publications

An Evaluation Study of a New Designed Oscillating Hydraulic Trainer of Neck

An Evaluation Study of a New Designed Oscillating Hydraulic Trainer of Neck

Changes in Impact Signals and Muscle Activity in Response to Different Shoe and Landing Conditions

Compression apparel does not have an acute effect on quadriceps strength but is associated with changes in muscle activation patterns

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