Reliability of surface EMG during sustained contractions of the quadriceps

Mathur, Sunita; Eng, Janice J.; MacIntyre, Donna L.

doi:10.1016/j.jelekin.2004.06.003

Cited by 136 publications

(174 citation statements)

References 36 publications

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“…The highest value from the 3 reproducible contractions (Ͻ 5% variability among attempts) was analyzed. 23 After a rest period of 5 min the endurance of the quadriceps femoris was evaluated with the isometric endurance test, at 60% of the MVIC, to the limit of tolerance. 23 A visual reference mark corresponding to the submaximal work load was shown on a computer screen in front of the subject for visual feedback.…”

Section: Current Knowledgementioning

confidence: 99%

“…23 After a rest period of 5 min the endurance of the quadriceps femoris was evaluated with the isometric endurance test, at 60% of the MVIC, to the limit of tolerance. 23 A visual reference mark corresponding to the submaximal work load was shown on a computer screen in front of the subject for visual feedback. In addition, during the whole test, verbal encouragement was given for the subject to maintain contraction as long as possible.…”

Section: Current Knowledgementioning

confidence: 99%

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Upper and Lower Limb Muscles in Patients With COPD: Similarities in Muscle Efficiency But Differences in Fatigue Resistance

et al. 2013

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BACKGROUND: Peripheral muscle dysfunction is a common finding in patients with COPD; however, the structural adaptation and functional impairment of the upper and lower limb muscles do not seem to be homogenous. We compared muscle fatigue and recovery time between 2 representative muscles: the middle deltoid and the quadriceps femoris. METHODS: Twenty-one subjects with COPD (FEV 1 46.1 ؎ 10.3% of predicted) underwent maximal voluntary isometric contraction and an endurance test (60% of maximal voluntary isometric contraction, to the limit of tolerance). The maximal voluntary isometric contraction test was repeated after 10 min, 30 min, 60 min, and 24 hours for both the quadriceps femoris and middle deltoid. Surface electromyography was recorded throughout the endurance test. RESULTS: Maximal voluntary isometric contraction significantly decreased only for the middle deltoid between 10 and 60 min after the endurance test. A significant increase of the root mean square and a greater decline in median frequency throughout the endurance test occurred for the middle deltoid, compared with the quadriceps femoris. When dyspnea and fatigue scores were corrected by endurance time, higher values were observed for the middle deltoid (0.07 and 0.08, respectively) in relation to the quadriceps femoris (0.02 and 0.03, respectively). CONCLUSIONS: Subjects with COPD had a higher fatigability of a representative upper limb muscle (middle deltoid) than a lower limb muscle (quadriceps femoris).

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Section: Current Knowledgementioning

confidence: 99%

Section: Current Knowledgementioning

confidence: 99%

Upper and Lower Limb Muscles in Patients With COPD: Similarities in Muscle Efficiency But Differences in Fatigue Resistance

et al. 2013

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“…Rectus femoris muscle 10 to 15 cm above the superior border of the patella over the largest part of the muscle belly parallel to the orientation of the muscle fibers (19).…”

Section: Paravertebral Musclesmentioning

confidence: 99%

Reliability of EMG activity in complete denture users during simulation of activities of daily living

Baldisserotto¹,

Trindade²,

Loss³

et al. 2010

Rev. odonto ciênc. (Online)

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Purpose: To describe a kinesiologic EMG method and determine the reliability of EMG activity of representative muscles of mastication (temporal, masseter), posture of neck (sternocleidomastoid, trapezius) and trunk (rectus abdominis, paravertebral), and lower extremity strength (rectus femoris, medial gastrocnemius) during simulation of activities of daily living.Methods: Ten edentulous healthy women (age: 58.2±5.6 yr old) were tested with and without their dentures. EMG signals were recorded for each subject during three trials of each kinesiologic test: to stand up/sit down on a chair (TC), to rise/lie down in the bed (TB), and to lift/lower bags (TW). The same-day reprodutibility of the EMG values was estimated by test-retest reliability analyses. For each test (TC, TB, and TW) the intraclass correlation coefficient (ICC) and 95% confidence interval were estimated stratified by muscle, presence or not of complete dentures, and movement during the test (up and down) considering the three repetitions per subject to assess consistency.Results: All muscles showed activation during the tests. The method yielded moderate to high ICCs; the highest test-retest reliability levels were estimated for the sternocleidomastoid (0.82-0.97) and paravertebral (0.86-0.99) muscles.Conclusion: These findings suggest that the described kinesiologic EMG method showed satisfactory reliability in this sample.Key words: Electromyography; complete dentures; activities of daily living ResumoObjetivo: Descrever uma metodologia de EMG cinesiológica e determinar a reprodutibilidade da atividade eletromiográfica dos músculos mastigatórios (m. temporal e m. masseter), posturais do pescoço (mm. esternocleidomastoideo e trapézio), posturais do tronco (mm. reto abdominal e paravertebrais) e de força das extremidades inferiores (mm. reto femoral e gastrocnemius medial) durante simulação de atividades de vida diária (AVDs).Metodologia: A amostra foi constituída por dez mulheres saudáveis, usuárias de prótese total bimaxilar, com idade média de 58,2 anos. Foram realizados três testes AVDs: levantar/ sentar da cadeira (TCAD), levantar/deitar na cama (TCAM) e pegar/largar sacolas (TSAC). A reprodutibilidade dos valores EMG foi analisada por teste-reteste. Para cada teste AVD foram estimados coeficiente de correlação intraclasse (CCIC) e intervalo de confiança de 95% com estratificação por músculo, condição com e sem prótese (suporte oclusal) e movimento durante o teste, considerando três repetições por sujeito para avaliar consistência.

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“…Daily variations in EMG recording may be associated with differences in electrode re-application, including alterations in electrode position and differences in skin preparation. Although EMG has demonstrated moderate to high levels of reliability during quadriceps contractions (Larsson et al, 2003;Mathur et al, 2005), the systems typically used have required wired attachment between electrodes and an EMG amplifier. Such systems are cumbersome when performing complex movements, limiting their application during field-based testing.…”

Section: Introductionmentioning

confidence: 99%

Reliability of telemetric electromyography and near-infrared spectroscopy during high-intensity resistance exercise

Scott¹,

Slattery

Sculley

et al. 2014

Journal of Electromyography and Kinesiology

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Reliability of surface EMG during sustained contractions of the quadriceps

Cited by 136 publications

References 36 publications

Upper and Lower Limb Muscles in Patients With COPD: Similarities in Muscle Efficiency But Differences in Fatigue Resistance

Upper and Lower Limb Muscles in Patients With COPD: Similarities in Muscle Efficiency But Differences in Fatigue Resistance

Reliability of EMG activity in complete denture users during simulation of activities of daily living

Reliability of telemetric electromyography and near-infrared spectroscopy during high-intensity resistance exercise

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