Reliability of resting intramuscular fiber conduction velocity evaluation

Methenitis, Spyridon; Karandreas, Nikolaos; Terzis, Gerasimos

doi:10.1111/sms.12908

Cited by 4 publications

(1 citation statement)

References 32 publications

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“…Increased action potential succession and the presence of calcium could promote trains of action potentials thus increasing peak power output [ 52 ]. In effect, this has been observed by monitoring electromyographic activity during maximum intensity efforts [ 53 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Beetroot Juice Supplementation on a 30-s High-Intensity Inertial Cycle Ergometer Test

et al. 2017

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Background: Beetroot juice (BJ) is rich in inorganic nitrates and has proved effective at increasing blood nitric oxide (NO) levels. When used as a supplement BJ has shown an ergogenic effect on cardiorespiratory resistance exercise modalities, yet few studies have examined its impact on high intensity efforts. Objective: To assess the effects of BJ intake on anaerobic performance in a Wingate test. Methods: Fifteen trained men (age 21.46 ± 1.72 years, height 1.78 ± 0.07 cm and weight 76.90 ± 8.67 kg) undertook a 30-s maximum intensity test on an inertial cycle ergometer after drinking 70 mL of BJ (5.6 mmol NO3−) or placebo. Results: Despite no impacts of BJ on the mean power recorded during the test, improvements were produced in peak power (6%) (p = 0.034), average power 0–15 s (6.7%) (p = 0.048) and final blood lactate levels (82.6%) (p < 0.001), and there was a trend towards a shorter time taken to attain peak power (−8.4%) (p = 0.055). Conclusions: Supplementation with BJ has an ergonomic effect on maximum power output and on average power during the first 15 s of a 30-s maximum intensity inertial cycle ergometer test.

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Section: Discussionmentioning

confidence: 99%

Effects of Beetroot Juice Supplementation on a 30-s High-Intensity Inertial Cycle Ergometer Test

et al. 2017

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Intramuscular fibre conduction velocity and muscle fascicle length in human vastus lateralis

Methenitis

Stasinaki

Zaras

et al. 2019

Appl. Physiol. Nutr. Metab.

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Muscle fascicle length and muscle fibre conduction velocity are thought to be important parameters for power performance. It might be expected that faster muscle fibre conduction velocities would compensate for longer fascicle lengths to increase the speed of action potential propagation along the elongated fibres. However, the relationship between muscle fascicle length and muscle fibre conduction velocity (MFCV) remains unknown. The aim of the present study was to explore the relationship between average vastus lateralis MFCV and average fascicle length. In seventeen moderately-trained healthy male physical education students (age 23.4 ± 3.1 years, body height 178 ± 5.5 cm, body mass 82.7 ± 6.9 kg, BMI 24.6 ± 1.5 kg∙m-2) resting MFCV was measured with intramuscular microelectrodes while muscle architecture was evaluated with ultrasonography. Fascicle length was highly correlated with total MFCV (r: 0.923, p = 0.000), maximum MFCV (r: 0.949, p = 0.000), and MFCV of the fastest (r: 0.709, p = 0.001), but not of the slowest fibres (r: 0.131, p = 0.616). No significant correlations were also found between vastus lateralis thickness or fascicle angle with any of MFCV parameters (r: 0.145 - 0.430; R2 < 0.130; p > 0.05). These data indicate that average MFCV is associated with average fascicle length in vastus lateralis muscle in different individuals. It seems that participants with longer fascicle lengths have also higher muscle fibre conduction velocities.

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Muscle fiber conduction velocity in situ revisited: A new approach to an ancient technique

Kouyoumdjian

Graça²

2023

Front. Neurol.

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The aim of this study was to measure the muscle fiber conduction velocity (MFCV) in situ in the tibialis anterior muscle in healthy subjects. A total of 36 subjects matched for age and sex were studied. The MFCV was measured with a concentric needle by intramuscular monopolar needle electrical activation at a distance of 50 mm. The mean consecutive difference (MCD) of <5 μs was obtained after a median of 62 muscle fiber action potentials (MFAPs), confirming a direct muscle fiber activation. The measuring latency was at the median point of ascending depolarizing line of the MFAP. The calculated MFCV from 784 MFAPs was 4.10 ± 0.66 m/s, 3.99 ± 0.57 for female subjects (95%, 2.85 to 5.13), and 4.20 ± 0.73 for male subjects (95%, 2.74 to 5.67). The MFCV was 5.22% faster in male subjects. The calculated fast-to-slow MFCV ratio (F/S ratio) was 1.47 for female subjects (95%, 1.27 to 2.54) and 1.67 for male subjects (95%, 1.31 to 3.74). Aging significantly increased the F/S ratio. As the MFCVs mainly depend on the muscle diameter, their assessment is a quick and helpful tool for estimating it. Its variability by the F/S ratio is also a powerful tool in the follow-up of some neuromuscular disorders.

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Reliability of resting intramuscular fiber conduction velocity evaluation

Cited by 4 publications

References 32 publications

Effects of Beetroot Juice Supplementation on a 30-s High-Intensity Inertial Cycle Ergometer Test

Effects of Beetroot Juice Supplementation on a 30-s High-Intensity Inertial Cycle Ergometer Test

Intramuscular fibre conduction velocity and muscle fascicle length in human vastus lateralis

Muscle fiber conduction velocity in situ revisited: A new approach to an ancient technique

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