EMG frequency content changes with increasing force and during fatigue in the quadriceps femoris muscle of men and women

Beznoska, Martin; Schindler-Ivens, Sheila; Williams, David M.; Chandran, Ravi; Sharma, Shreela V.

doi:10.1016/s1050-6411(02)00050-0

Cited by 200 publications

(189 citation statements)

References 30 publications

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“…21,22 Females have been found to have a higher proportion of slow fibers in their muscles in a number of studies using quadriceps muscle biopsies or EMG power spectrum analyses; however, this finding has not been uniform. [23][24][25] Staron and colleagues 25 reported that while no significant difference in the number of slow and fast fibers was observed between sexes, females had a larger area of their vastus lateralis muscles occupied by slow fibers, whereas males had a larger area occupied by fast fibers. Males have also consistently been found to have fibers with larger cross-sectional areas than females.…”

Section: Discussionmentioning

confidence: 98%

Quadriceps and hamstrings muscle control in athletic males and females

Krishnan

Huston

Amendola

et al. 2008

Journal Orthopaedic Research

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The aim of this study was to investigate whether athletic males and females have differences in their quadriceps and hamstrings muscle control strategies. Twenty-four people (12 males, 12 females) active in level I activities volunteered to participate. The subjects' muscle control strategies were studied using electromyography and a target matching protocol that assesses one's ability to produce force with control. The degree of control exhibited in the subjects' quadriceps and hamstrings muscle activation strategies was evaluated by calculating specificity indices for each muscle using circular statistics. Females displayed significantly lower specificity than males in their vastus medialis (p < 0.001), rectus femoris (p ¼ 0.044), and lateral hamstrings (p ¼ 0.001) muscle activity patterns, but similar specificity in their vastus lateralis and medial hamstrings activity patterns. Females also used a significantly higher magnitude of vastus lateralis (p < 0.001) and vastus medialis (p < 0.001) muscle activity than males to achieve the same relative force level. These findings indicate athletic males and females have differences in their knee muscle control strategies. ß

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Section: Discussionmentioning

confidence: 98%

Quadriceps and hamstrings muscle control in athletic males and females

Krishnan

Huston

Amendola

et al. 2008

Journal Orthopaedic Research

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“…The decreased conduction speed of the muscle fibers caused by the muscle fatigue results in a reduction in Type II muscle fiber activation, with an increase Type I muscle fiber activation. This results in the MDF shifting to the low frequency band [24][25][26][27][28][29] . Traditionally, frequency spectrum analysis has been carried out by recording the EMG signals during isometric contractions.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Microcurrent-Inducing Shoes on Fatigue and Pain in Middle-Aged People with Plantar Fascitis

et al. 2007

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Abstract. When a muscle is used repeatedly for a long time, it often leads to muscular fatigue and muscle soreness. In middle-aged and elderly populations, muscular fatigue and pain during the performance of activities of daily living is a common problem caused by physiological changes in the musculoskeletal system due to the aging process. Microcurrent therapy has been shown to be effective at reducing pain and muscle soreness. For activities such as standing or walking, specially developed shoes (G-man, Busan, South Korea) which are capable of providing microcurrent therapy during the performance of these activities are an advantage as the treatment becomes integrated with the activity being performed. These therapeutic shoes or microcurrent induction shoes could be potentially useful for providing treatment if they were worn during normal activities. The purpose of this study, therefore, was to investigate the effect of these microcurrent induction shoes on pain and muscle fatigue in middle-aged people with plantar fascitis. Subjects were asked to wear their normal shoes and instructed to walk on a treadmill at 2 and 3 km/hr for 10 minutes each. Subjects were then asked to wear the specially designed microcurrent induction shoes for six weeks for at least 4 hours per day during ADL activities such as standing and walking. During the initial evaluation and at the end of the 6 weeks intervention, the electromyographic (EMG) activity of their right tibialis anterior and soleus muscles were recorded, together with their perceived level of foot pain using a Visual Analogue Scale (VAS). The results showed a significant reduction in their VAS scores (p<0.01), and the change in median power frequency of their tibialis anterior EMG recording (p<0.05). In conclusion, this study demonstrated that microcurrent induction shoes were effective in relieving foot pain and muscle fatigue in subjects with plantar fascitis.

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“…This method quantifies electric manifestations of neuromuscular activity -amplitude, frequency or timing (e.g. Bilodeau et al 2003;Konrad, 2005). Kinesiological orientation of EMG can be described as the study of neuromuscular activation of muscles during observation of functional movement activity and regime of muscles during their activity (Konrad, 2005).…”

Section: Introductionmentioning

confidence: 99%

Muscle activation of a sportsman and an untrained man

Korvas

Kotova

Horáková

2016

jhse

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The research was focused to analyse the muscle activation using sEMG during repeated physical activity. The purpose of this study was to find out differences between a sportsman and an untrained man in the timing of muscle activation during increasing load. Two men took part in the research. The untrained man (MN) 20 years old, 180 cm, 74 kg, sportsman (MS) 22 years old, 177 cm, 87 kg. Participants performed repeated flexion and extension in the elbow joint. Muscle activation has been tested using sEMG on the selected muscles: biceps brachii (BB), brachioradialis (B), trapezius p. descendez (TD), deltoideus p. acromialis (DA). Both participants performed test for 5, 8 and 12 kg load. Number of repetition was 10. In flexion, the time of muscle activations were the same or very similar for BB for both participants and longer in MN for B and DA, for TD were longer in MS for all loads. Differences were caused firstly by a different finishing time. In extension DA and B in MN, partly also TD were activated for a longer time. The time for activation of BB was mostly the same. Differences were caused mainly by the later start of the activation in MS. Also tendencies in prolonging and shortening the time of activation in relation to increasing load in both participants demonstrated different characteristics. Significantly longer time of muscle activation of MN has been proved only for B and DA for both kinds of movements. Differences between participants in the total time of activation at absolutely same load were expected especially because of the better movement efficiency, adaptation to the power load and movement technique in MS.

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EMG frequency content changes with increasing force and during fatigue in the quadriceps femoris muscle of men and women

Cited by 200 publications

References 30 publications

Quadriceps and hamstrings muscle control in athletic males and females

Quadriceps and hamstrings muscle control in athletic males and females

The Effect of Microcurrent-Inducing Shoes on Fatigue and Pain in Middle-Aged People with Plantar Fascitis

Muscle activation of a sportsman and an untrained man

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