Beneficial effects of serial contractions on muscle performance after a brief period of rest

Green, Lara A.; Parro, Justin J.; Gabriel, David A.

doi:10.1007/s00421-014-2896-8

Cited by 4 publications

(3 citation statements)

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“…The higher MPF we observed was most likely due to muscle fiber conduction velocity changes between 50% and 100% MVC . Accordingly, a nearly identical MPF of 123 ± 27 H z was reported for the tibialis anterior at 100% MVC using bipolar electrodes placed away from the motor point …”

Section: Discussionsupporting

confidence: 71%

“…37,38 Accordingly, a nearly identical MPF of 123 6 27 HZ was reported for the tibialis anterior at 100% MVC using bipolar electrodes placed away from the motor point. 39 With this electrode placement, G2 may still be within the innervation zone. 4 Therefore, it is reasonable to question the variability of amplitude and spectral estimates we obtained.…”

Section: Discussionmentioning

confidence: 99%

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Flexor carpi radialis surface electromyography electrode placement for evoked and voluntary measures

2015

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Flexor carpi radialis surface electromyography electrode placement for evoked and voluntary measures

2015

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“…A load cell (JR3, Woodland, CA, USA) was secured under the foot plate of which the foot was restrained by a minimally padded steel bar located proximal to the metatarsals for all torque recordings (Christie et al 2009). There were 3 days of testing to assess the reliability of the measures as participants can exhibit a learning effect during maximal strength assessment (Green et al 2014). On each day, participants were asked to perform the same tasks.…”

Section: Methodsmentioning

confidence: 99%

Neural, biomechanical, and physiological factors involved in sex-related differences in the maximal rate of isometric torque development

2016

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ObjectiveRecent research has reported that lower maximal rate of torque development (dτ/dt max) exhibited by females, relative to males, during knee extension can be accounted for by normalization to a maximal voluntary contraction (MVC); however, this was not seen in the upper limb.PurposeThe aim of the current work was to examine the contribution of maximum strength (τmax), twitch contraction time (CT), muscle fiber condition velocity (MFCV), and rate of muscle activation (Q30) to sex-differences in the dτ/dt max during maximal isometric dorsiflexion.MethodsThirty-eight participants (20 males; 18 females) performed both maximal voluntary and evoked isometric contractions of the tibialis anterior across 3 days. Ten maximal compound muscle action potentials were elicited and subsequently followed by three, 5-s contractions. From the recordings, MFCV, dτ/dt max, τmax, CT, electromechanical delay (EMD), root-mean squared (RMS) amplitude, peak-to-peak voltage (Vpp), and Q30 were calculated.ResultsAn ANCOVA showed that τmax accounted for all the sex-differences in dτ/dt max (p = 0.96). There were no significant differences between groups with respect to MFCV, RMS amplitude, Vpp amplitude, or CT. However, there was a significant sex-difference in dτ/dt max, τmax, and Q30. Females had longer evoked EMD times compared with males (15.69 ± 10.57 ms versus 9.95 ± 3.46 ms; p = 0.01), but the voluntary EMD times were not different.ConclusionThe current research supports the work by Hannah et al. Exp Physiol 97:618–629, (2012) that normalization to MVC in the quadriceps is able to account for all sex-differences in rate of toque development in the lower limb.

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The electronic counting arm movement test (eCAM test)

Bodranghien

Martin

Ansay

et al. 2014

Neurological Research

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A novel transportable electronic platform aiming to characterize the performance of successive fast vertical visually guided pointing movements toward two fixed targets (eCAM test: electronic counting arm movement test) is described and one validation test is presented. This platform is based on an Arduino(®) micro-controller and a Processing(®) routine. It records both the pointing performance (number of clicks) and the elapsed time between two successive pointing movements. Using this novel platform, we studied the effects of functional electrical stimulation (FES) applied on the dominant upper limb in 15 healthy volunteers (mean age ± SD: 22.3 ± 4.3 years; 5 males/10 females). The following muscles were stimulated: flexor carpi radialis (FCR), extensor carpi radialis (ECR), biceps brachii (BB), and triceps brachii (TB). The intensities of the stimulation were 2 and 3 mA above the sensory threshold (ST). Movement times were lesser when performed against gravity and pointing performance improved with FES. We provide the first demonstration that low-intensity FES impacts on motor performances during successive vertical goal-directed pointing movements under visual guidance. The eCAM test is currently the sole electronic tool to assess quickly and easily the performances of successive vertical pointing movements. Future potential applications include, in particular, the follow-up of the effects of neurorehabilitation of neurological/neurosurgical disorders associated with hand-eye incoordination, the functional evaluation of upper limb prosthesis or orthosis, and the analysis of the effects of FES in central or peripheral nervous system disorders.

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Beneficial effects of serial contractions on muscle performance after a brief period of rest

Cited by 4 publications

References 43 publications

Flexor carpi radialis surface electromyography electrode placement for evoked and voluntary measures

Flexor carpi radialis surface electromyography electrode placement for evoked and voluntary measures

Neural, biomechanical, and physiological factors involved in sex-related differences in the maximal rate of isometric torque development

The electronic counting arm movement test (eCAM test)

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