It is well known that centre of pressure (CoP) displacement correlates negatively with the maximal isometric torque (MIT) ankle muscles. This relationship has never been investigated in elderly fallers. The purpose this study was thus to analyse between MIT muscles and CoP upright stance a sample aged 18 90 years old included aim identify threshold below which balance compromised. Plantar flexors (PF) dorsal (DF) were measured volunteers: 21 healthy young adults (age: 24.1 ± 5.0), 12...

The distribution of activation among muscles from the same anatomical group can be affected by mechanical constraints task, such as limb orientation. For example, between gastrocnemius medialis (GM) and lateralis (GL) during submaximal plantarflexion depends on orientation foot in horizontal plane. neural mechanisms behind these modulations are not known. overall aim this study was to determine whether excitability two is differentially changes Nineteen males performed isometric...

Peripheral neuropathy is one of the most common complications type 2 diabetes, which can lead to impaired balance and walking. Innovative footwear devices designed stimulate foot sensory receptors, such as vibrating insoles, could offer a new route improve motor impairments in people with diabetic peripheral (DPN).

Abstract Understanding flexibility in the neural control of movement requires identifying distribution common inputs to motor units. In this study, we identified large samples units from two lower limb muscles: vastus lateralis (VL; up 60 per participant) and gastrocnemius medialis (GM; 67 participant). First, applied a linear dimensionality reduction method assess manifolds underlying unit activity. We subsequently investigated under conditions: sinusoidal contractions with torque feedback,...

Eccentric exercise training is believed to induce an increase in muscle fascicle length. However, the mechanisms underlying this adaptation are not fully understood. This study aimed determine if gastrocnemius medialis length following 8-week eccentric linked changes tissue and joint mechanical properties. Thirty-three physically active young adults were assigned one of two protocols targeting plantar flexors: at 1) long-muscle or 2) short-muscle Fascicle shear modulus assessed using...

some centenarians are engaged in regular physical activity and sometimes sporting events. we aimed to identify world records of centenarian athletes several sports determine which represented the best performance when compared all-age records, all disciplines taken together. performances achieved by were identified three disciplines: athletics, swimming cycling. The considered as an average respective speeds, except for jumping throwing events maximum distances performed considered. Within...

Post-activation potentiation (PAP) is defined as an enhanced contractile response of a muscle following its own activity and influenced by the intensity duration conditioning contraction. The aim this study was to determine if combination duration, that is, torque-time integral (TTI) determinant PAP amplitude. We compared amplitude low-to-maximal voluntary contraction intensities with without similar TTI in knee extensors. Twelve healthy males completed two experimental sessions. Femoral...

Torque time integral (TTI) is the combination of intensity and duration a contraction. The aim this study was to compare neuromuscular alterations following different isometric sub-maximal contractions knee extensor muscles but with similar TTI. Sixteen participants performed 3 sustained at intensities (25%, 50%, 75% Maximal Voluntary Contraction (MVC) torque) durations (68.5±33.4 s, 35.1±16.8 s 24.8±12.9 respectively) TTI value. MVC torque, maximal voluntary activation level (VAL), M-wave...

Introduction This study aimed to determine the intra- and inter-session reliability of neuromuscular assessment plantar flexor (PF) muscles at three knee angles. Methods Twelve young adults were tested for angles (90°, 30° 0°) time points separated by 1 hour (intra-session) 7 days (inter-session). Electrical (H reflex, M wave) mechanical (evoked maximal voluntary torque, activation level) parameters measured on PF muscles. Intraclass correlation coefficients (ICC) variation calculated...

The aim of this study was to determine how muscle activity and body orientation contribute the triceps surae spinal transmission modulation, when moving from a sitting standing position. Maximal Hoffmann-reflex (Hmax) motor potential (Mmax) were evoked in soleus (SOL), medial lateral gastrocnemius 10 male subjects three conditions, passive sitting, active upright standing, with same SOL standing. Moreover volitional wave (V) two conditions (i.e., standing). results showed that Hmax/Mmax...

Original results are that in response to passive muscle lengthening and increased length, inhibition of the effectiveness activated Ia afferents discharge α-motoneurons increases, with primary afferent depolarization homosynaptic postactivation depression mechanisms playing central roles this regulatory process. Our findings highlight for first time a cumulative inhibitory effect length on α-motoneurons.

Abstract Understanding flexibility in the neural control of movement requires identifying distribution common inputs to motor units. In this study, we identified large samples units from two lower limb muscles: vastus lateralis (VL; up 60 units/participant) and gastrocnemius medialis (GM; 67 units/participant). First, applied a linear dimensionality reduction method assess manifolds underlying unit activity. We subsequently investigated under conditions: sinusoidal contractions with torque...

Summary This study aimed to compare the effect of different types pressure applied stimulation electrode on assessing efficiency Ia‐α‐motoneuron transmission soleus muscle and associated discomfort using electrical nerve stimulation. Twelve healthy young adults participated in three experimental sessions (one for each knee angle). The amplitudes maximal Hoffmann reflex ( H max ) motor potential M were recorded from at 0°, 30° 90° angles (0° full extension) through applications electrode: no...

The fatigue induced by fencing remains scarcely investigated. We aimed to investigate both objective (neuromuscular performance fatigability) and subjective (perceived fatigue, effort, workload) manifestations of in elite fencers following a five-bout simulated competition. Changes countermovement jump height, knee extensors maximal isometric torque, rate torque development, voluntary activation, contractile response muscular electrical stimulation were measured 29 [12 epee (6 women), 11...

Context: Prolonged tendon vibration may induce muscle fatigue, as assessed by a decrease in maximal force production. It remains unknown, however, whether the strength after prolonged Achilles is related to frequency. Objective: To assess capacity of plantar-flexor (PF) neuromuscular function before and at low high frequencies generated using portable device. Design: Pre- posttest intervention with control. Setting: University laboratory. Participants: 10 healthy men age 22.6 ± 4.0 y....

To investigate the immediate effects of wearing novel sensory-stimulating textured insoles on balance and gait in 41 people with multiple sclerosis (pwMS).Assessments (firm/foam surface; eyes open/closed) walking (when negotiating even/uneven surfaces) were performed insoles, smooth shoes only, barefoot. Outcome measures centre pressure (CoP) movement during standing (elliptical area, sway path velocity) spatiotemporal patterns (stride/step width, stride time, double-limb support length,...

Persistent inward currents (PICs) increase the intrinsic excitability of α-motoneurons. The main objective this study was to compare estimates α-motoneuronal PICs between inactive, chronic resistance-trained, and endurance-trained young individuals. We also aimed investigate whether there is a relationship in PIC magnitude muscles. Estimates were obtained three groups individuals: resistance-trained (