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3 résultat(s) recherche sur le mot-clé 'Perturbation'
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Adjustments after an ankle dorsiflexion perturbation during human running / Mikael Scohier in Gait & posture, Vol. 35, n°1 (Janvier 2012)
[article]
Titre : Adjustments after an ankle dorsiflexion perturbation during human running Type de document : document électronique Auteurs : Mikael Scohier ; D. De Jaeger ; B. Schepens Année de publication : 2012 Langues : Anglais (eng) Mots-clés : Human running Perturbation Exoskeleton Ground reaction forces Résumé : In this study we investigated the effect of a mechanical perturbation of unexpected timing during human
running. With the use of a powered exoskeleton, we evoked a dorsiflexion of the right ankle during its
swing phase while subjects ran on a treadmill. The perturbation resulted in an increase of the right ankle
dorsiflexion of at least 58. The first two as well as the next five steps after the perturbation were analyzed
to observe the possible immediate and late biomechanical adjustments. In all cases subjects continued to
run after the perturbation. The immediate adjustments were the greatest and the most frequent when
the delay between the right ankle perturbation and the subsequent right foot touch-down was the
shortest. For example, the vertical impact peak force was strongly modified on the first step after the
perturbations and this adjustment was correlated to a right ankle angle still clearly modified at touchdown.
Some late adjustments were observed in the subsequent steps predominantly occurring during
left steps. Subjects maintained the step length and the step period as constant as possible by adjusting
other step parameters in order to avoid stumbling and continue running at the speed imposed by the
treadmill. To our knowledge, our experiments are the first to investigate perturbations of unexpected
timing during human running. The results show that humans have a time-dependent, adapted strategy
to maintain their running pattern.En ligne : https://www.researchgate.net/publication/51600521_Adjustments_after_an_ankle_dor [...] Permalink : ./index.php?lvl=notice_display&id=84532
in Gait & posture > Vol. 35, n°1 (Janvier 2012)[article] Adjustments after an ankle dorsiflexion perturbation during human running [document électronique] / Mikael Scohier ; D. De Jaeger ; B. Schepens . - 2012.
Langues : Anglais (eng)
in Gait & posture > Vol. 35, n°1 (Janvier 2012)
Mots-clés : Human running Perturbation Exoskeleton Ground reaction forces Résumé : In this study we investigated the effect of a mechanical perturbation of unexpected timing during human
running. With the use of a powered exoskeleton, we evoked a dorsiflexion of the right ankle during its
swing phase while subjects ran on a treadmill. The perturbation resulted in an increase of the right ankle
dorsiflexion of at least 58. The first two as well as the next five steps after the perturbation were analyzed
to observe the possible immediate and late biomechanical adjustments. In all cases subjects continued to
run after the perturbation. The immediate adjustments were the greatest and the most frequent when
the delay between the right ankle perturbation and the subsequent right foot touch-down was the
shortest. For example, the vertical impact peak force was strongly modified on the first step after the
perturbations and this adjustment was correlated to a right ankle angle still clearly modified at touchdown.
Some late adjustments were observed in the subsequent steps predominantly occurring during
left steps. Subjects maintained the step length and the step period as constant as possible by adjusting
other step parameters in order to avoid stumbling and continue running at the speed imposed by the
treadmill. To our knowledge, our experiments are the first to investigate perturbations of unexpected
timing during human running. The results show that humans have a time-dependent, adapted strategy
to maintain their running pattern.En ligne : https://www.researchgate.net/publication/51600521_Adjustments_after_an_ankle_dor [...] Permalink : ./index.php?lvl=notice_display&id=84532 Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Triceps Surae Stretch Reflex Modulation After a Mechanically Evoked Ankle Dorsiflexion During the Swing Phase of Human Running / Mikael Scohier in Motor control [périodique éléctronique], Vol.18, n°4 (2014)
[article]
Titre : Triceps Surae Stretch Reflex Modulation After a Mechanically Evoked Ankle Dorsiflexion During the Swing Phase of Human Running Type de document : document électronique Auteurs : Mikael Scohier ; D. De Jaeger ; B. Schepens Année de publication : 2014 Article en page(s) : p. 383-394 Langues : Français (fre) Mots-clés : locomotion perturbation exoskeleton Résumé : The purpose of this study was to mechanically evoke a triceps surae stretch reflex during the swing phase of running, to study its within-the-step phase dependency. Seven participants ran on a treadmill at 2.8 m·s–1 wearing an exoskeleton capable of evoking a sudden ankle dorsiflexion. We measured the electromyographic activity of the soleus, medial and lateral gastrocnemii just after the perturbation to evaluate the triceps surae stretch reflex. Similar perturbations were also delivered at rest. Our results showed that the stretch reflex was suppressed during the swing phase of running, except in late swing where a late reflex response was observed. At rest, all triceps surae muscles showed an early reflex response to stretch. Our findings suggest that the triceps surae short/medium-latency stretch reflex cannot be evoked during swing phase and thus cannot contribute to the control of the locomotor pattern after aperturbation during this phase En ligne : https://www.researchgate.net/profile/Benedicte_Schepens/publication/261520793_Tr [...] Permalink : ./index.php?lvl=notice_display&id=84534
in Motor control [périodique éléctronique] > Vol.18, n°4 (2014) . - p. 383-394[article] Triceps Surae Stretch Reflex Modulation After a Mechanically Evoked Ankle Dorsiflexion During the Swing Phase of Human Running [document électronique] / Mikael Scohier ; D. De Jaeger ; B. Schepens . - 2014 . - p. 383-394.
Langues : Français (fre)
in Motor control [périodique éléctronique] > Vol.18, n°4 (2014) . - p. 383-394
Mots-clés : locomotion perturbation exoskeleton Résumé : The purpose of this study was to mechanically evoke a triceps surae stretch reflex during the swing phase of running, to study its within-the-step phase dependency. Seven participants ran on a treadmill at 2.8 m·s–1 wearing an exoskeleton capable of evoking a sudden ankle dorsiflexion. We measured the electromyographic activity of the soleus, medial and lateral gastrocnemii just after the perturbation to evaluate the triceps surae stretch reflex. Similar perturbations were also delivered at rest. Our results showed that the stretch reflex was suppressed during the swing phase of running, except in late swing where a late reflex response was observed. At rest, all triceps surae muscles showed an early reflex response to stretch. Our findings suggest that the triceps surae short/medium-latency stretch reflex cannot be evoked during swing phase and thus cannot contribute to the control of the locomotor pattern after aperturbation during this phase En ligne : https://www.researchgate.net/profile/Benedicte_Schepens/publication/261520793_Tr [...] Permalink : ./index.php?lvl=notice_display&id=84534 Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Comment éviter les perturbateurs endocriniens ? / V XHONNEUX in Imagine demain le monde, 77 (janv-fév 2010)
[article]
Titre : Comment éviter les perturbateurs endocriniens ? Type de document : texte imprimé Auteurs : V XHONNEUX, Auteur ; P TITEUX, Auteur Année de publication : 2010 Article en page(s) : pp. 20-21 Langues : Français (fre) Mots-clés : ENDOCRINIEN SYSTEME PERTURBATION Permalink : ./index.php?lvl=notice_display&id=21822
in Imagine demain le monde > 77 (janv-fév 2010) . - pp. 20-21[article] Comment éviter les perturbateurs endocriniens ? [texte imprimé] / V XHONNEUX, Auteur ; P TITEUX, Auteur . - 2010 . - pp. 20-21.
Langues : Français (fre)
in Imagine demain le monde > 77 (janv-fév 2010) . - pp. 20-21
Mots-clés : ENDOCRINIEN SYSTEME PERTURBATION Permalink : ./index.php?lvl=notice_display&id=21822 Exemplaires (1)
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