Differential impact of visual feedback on plantar- and dorsi-flexion maximal torque output

Toumi, Anis; Jakobi, Jennifer M.; Simoneau-Buessinger, Émilie

doi:10.1139/apnm-2015-0639

Cited by 13 publications

(8 citation statements)

References 23 publications

(21 reference statements)

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“…The participants were instructed to develop MVCs as fast as possible. Visual feedback and encouragement [19,20] were given during all the MVC and RTD efforts. The RTD was calculated as the slope between two consecutive time units until the maximal achievable moment was achieved.…”

Section: Methodsmentioning

confidence: 99%

Anterior subject positioning affects the maximal exerted isometric plantar flexion moment

Stafilidis

Sickinger

2019

PLoS ONE

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We examined the effect of increased anterior subject positioning toward the dynamometer’s footplate during maximal voluntary isometric contractions (MVCs) on the joint moment, rotation and rate of torque development (RTD). Fourteen subjects, with their hip flexed (110°) and knee fully extended (180°), underwent ramp maximal and rapid voluntary isometric plantar flexion contractions at 4 different positions (0, 3, 6 and 8 cm; randomized). At position “0 cm”, the foot was in full contact with the footplate; at the additional positions, the chair was moved forward. Body kinematics (VICON) and kinetics (HUMAC Norm, PEDAR) were captured synchronously during MVCs and RTDs. The results showed that the maximal exerted joint moment was significantly (p<0.01) increased by >32% from the 0-cm to 8-cm position (126 and 172 Nm, respectively); however, at the “6 cm” and “8 cm” positions, no significant difference was found. The joint rotation was significantly (p<0.01) reduced by >50% (from 15.5 to 7.1°; 0–8 cm). The maxRTD was only significantly higher at “6 cm” compared with the “0 cm” position. The time to reach maxRTD showed shorter tendencies for the “8 cm” position than for all other positions. The results indicate an underestimation of the plantar flexor maximal force potential with the current measuring technique. This could be critical in pre-post study designs where a 2-cm alteration in the chair position can induce an error of ~9% in the joint moment. The joint rotation could be reduced but not completely eliminated. For position standardization purposes, a pressure >220 kPa under the subject’s foot is needed to achieve the maximal joint moment. We discussed the possible origins (fascicle length, neural drive) of the increased joint moment.

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Section: Methodsmentioning

confidence: 99%

Anterior subject positioning affects the maximal exerted isometric plantar flexion moment

Stafilidis

Sickinger

2019

PLoS ONE

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“…In general, it improves test performance. For tests of isometric strength, performance increases 3% for the elbow flexors (317), 8% for the knee extensors (256), 8% for grip strength (40), and~16% for the ankle plantarflexors (410). For isokinetic tests of the knee extensors, visual feedback improves peak torque~6% (22,68,131,166,211).…”

Section: Administrative Strategies and The Test Environmentmentioning

confidence: 99%

CORP: Measurement of upper and lower limb muscle strength and voluntary activation

Nuzzo

Taylor

Gandevia

2019

Journal of Applied Physiology

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Muscle strength, the maximal force-generating capacity of a muscle or group of muscles, is regularly assessed in physiological experiments and clinical trials. An understanding of the expected variation in strength and the factors that contribute to this variation is important when designing experiments, describing methodologies, interpreting results, and attempting to replicate methods of others and reproduce their findings. In this review (Cores of Reproducibility in Physiology), we report on the intra- and inter-rater reliability of tests of upper and lower limb muscle strength and voluntary activation in humans. Isometric, isokinetic, and isoinertial strength exhibit good intra-rater reliability in most samples (correlation coefficients ≥0.90). However, some tests of isoinertial strength exhibit systematic bias that is not resolved by familiarization. With the exception of grip strength, few attempts have been made to examine inter-rater reliability of tests of muscle strength. The acute factors most likely to affect muscle strength and serve as a source of its variation from trial-to-trial or day-to-day include attentional focus, breathing technique, remote muscle contractions, rest periods, temperature (core, muscle), time of day, visual feedback, body and limb posture, body stabilization, acute caffeine consumption, dehydration, pain, fatigue from preceding exercise, and static stretching >60 s. Voluntary activation, the nervous system’s ability to drive a muscle to create its maximal force, exhibits good intra-rater reliability when examined with twitch interpolation (correlation coefficients >0.80). However, inter-rater reliability has not been formally examined. The methodological factors most likely to influence voluntary activation are myograph compliance and sensitivity; stimulation location, intensity, and inadvertent stimulation of antagonists; joint angle (muscle length); and the resting twitch.

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“…The results of this study showed that the tongue strength was higher when the VF was applied than when VF was not applied. Previous studies have reported that VF is beneficial in increasing muscle contraction and muscle activation 5 , 6 ) . Park et al 7 ) reported that breathing exercise with VF improved pulmonary function and increased respiratory muscle activity.…”

Section: Discussionmentioning

confidence: 95%

Difference in tongue strength using visual feedback in healthy adults

et al. 2017

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[Purpose] This study investigated the difference in tongue strength with and without visual feedback in healthy adults. [Subjects and Methods] A total of 30 healthy adults were recruited. We measured the strength of the anterior region of the tongue before and after applying visual feedback using the Iowa Oral Performance Instrument. [Results] The tongue strength was measured as 45.5 ± 9.3 kilopascals with visual feedback and 41.1 ± 8.6 kilopascals without visual feedback, showing a statistically significant difference. [Conclusion] Visual feedback may be an effective tool for increasing the strength of the tongue.

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Differential impact of visual feedback on plantar- and dorsi-flexion maximal torque output

Cited by 13 publications

References 23 publications

Anterior subject positioning affects the maximal exerted isometric plantar flexion moment

Anterior subject positioning affects the maximal exerted isometric plantar flexion moment

CORP: Measurement of upper and lower limb muscle strength and voluntary activation

Difference in tongue strength using visual feedback in healthy adults

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