Repeatability of maximal voluntary force and of surface EMG variables during voluntary isometric contraction of quadriceps muscles in healthy subjects

Rainoldi, Alberto; Bullock-Saxton, Joanne; Cavarretta, F; Hogan, Neville

doi:10.1016/s1050-6411(01)00022-0

Cited by 106 publications

(118 citation statements)

References 32 publications

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“…Due to there being no preferred, or single statistical approach, the evaluation of measurement reliability is somewhat problematic (Hopkins 2000). In this regard, and in line with other investigations evaluating reliability of responses from the knee-extensors (Bachasson et al 2013;Rainoldi et al 2001), we used two approaches to evaluate measurement reliability, the CV and ICC, which provide an absolute and relative assessment, respectively. An excellent level of reliability was evident for measures of neuromuscular function pre-exercise (Table 2), which is in line with the previous work from our laboratory (Goodall et al 2015b;Thomas et al 2015), and importantly, enabled us to detect significant changes throughout the soccer-specific exercise.…”

Section: Discussionmentioning

confidence: 99%

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

et al. 2017

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ET, −18%, P ≤ 0.01), and voluntary activation measured with TMS (−11, −15 and −17%, respectively, P ≤ 0.01) were evident. The fatigue response was robust across both trials; the change in MVC at each time point demonstrated a good level of reliability (CV range 6-11%; ICC 2,1 0.83-0.94), whilst the responses identified with motor nerve stimulation showed a moderate level of reliability (CV range 5-18%; ICC 2,1 0.63-0.89) and the data obtained with motor cortex stimulation showed an excellent level of reliability (CV range 3-6%; ICC 2,1 0.90-0.98). Conclusion Simulated soccer exercise induces a significant level of fatigue, which is consistent on repeat tests, and involves both central and peripheral mechanisms. Keywords

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Section: Discussionmentioning

confidence: 99%

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

et al. 2017

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“…This assertion is based on previous studies that demonstrated preserved or even increased oxidative capacity, 7 as well as a concomitant presence of the normal, atrophic, and hypertrophic pattern of fibers within the middle deltoid, when compared to a control group. 15 Although widely used for evaluation of muscle fatigue, submaximal sustained isometric contraction [40][41][42][43][44] has the disadvantage of being dependent on motivation. However, we used electromyography during the tests, which provides a more objective evaluation of muscle fatigue.…”

Section: Discussionmentioning

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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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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“…Reliability of EMG data between testing sessions has typically been assessed for isometric (11,14,16,17,23), slow dynamic (2,19), and infrequently for ballistic movements (8). The reliability of EMG data between testing sessions of isometric exercises has been shown to be highly reliable for quadriceps muscle activation, with a mean ICC of 0.99 and CVintra ranging from 5.30% to 7.2% (14,17) and moderately to high reliable for the hamstrings, with ICC values ranging from 0.69 to 0.77 (11). Similarly, the reliability of MG data between testing sessions of slow dynamic and ballistic movements revealed high reliability for several lower-leg muscles during gait (2,10) and for the quadriceps during vertical jumping, with ICC values of 0.70 to 0.88 (8).…”

Section: Introductionmentioning

confidence: 99%

Reliability of Surface Electromyography During Maximal Voluntary Isometric Contractions, Jump Landings, and Cutting

Fauth

Petushek

Feldmann

et al. 2010

Journal of Strength and Conditioning Research

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The reliability of electromyographic (EMG) data has been examine for isometric and slow dynamic tasks, but little is known about the repeatability of this data for ballistic movements. The purpose of this study was to examine the within-session, trial-to-trial reliability of a variety of quadriceps and hamstrings muscles during isometric and ballistic activities. Data were analayzed by way of intraclass correlation coefficients (ICC), inter-subject coefficients of variation (CVinter), and intra-subject coefficients (CVintra). Twenty-four subjects performed 3 repetitions each of 2 randomly ordered test exercises, including landing from a depth jump (J) and cutting after a 10-m sprint (C). Data were acquired and processed with root mean square EMG for the muscles assessed, and data were analyzed for each exercise using a repeated measures analysis of variance. Results revealed that all ICC values were greater than 0.80, with most values greater than 0.90, CVinter values ranged from 5.4% to 148.7%, and CVintra values ranged from 11.5% to 49.3%. This study indicates that EMG is a reliable method for assessing the reproducibility of both the quadriceps and hamstrings muscle activation during either isometric or ballistic exercises.

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Repeatability of maximal voluntary force and of surface EMG variables during voluntary isometric contraction of quadriceps muscles in healthy subjects

Cited by 106 publications

References 32 publications

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

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

Reliability of Surface Electromyography During Maximal Voluntary Isometric Contractions, Jump Landings, and Cutting

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