scholarly journals Lower‐limb muscle responses evoked with noisy vibrotactile foot sole stimulation

2020 ◽  
Vol 8 (15) ◽  
Author(s):  
Ryan M. Peters ◽  
Robyn L. Mildren ◽  
Aimee J. Hill ◽  
Mark G. Carpenter ◽  
Jean‐Sébastien Blouin ◽  
...  
Keyword(s):  
Lower Limb ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Muscle Responses ◽  
Foot Sole Stimulation

Frequency-Specific Modulation of Vestibular-Evoked Sway Responses in Humans

2010 ◽  
Vol 103 (2) ◽  
pp. 1048-1056 ◽  
Author(s):  
Christopher J. Dakin ◽  
Billy L. Luu ◽  
Kees van den Doel ◽  
John Timothy Inglis ◽  
Jean-Sébastien Blouin
Keyword(s):  
Lower Limb ◽  
Muscle Activity ◽  
Vestibular Stimulation ◽  
Standing Balance ◽  
Whole Body ◽  
Body Sway ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Low Pass ◽  
Muscle Responses

Galvanic vestibular stimulation (GVS) results in characteristic muscle and whole-body responses in humans maintaining standing balance. However, the relationship between these two vestibular-evoked responses remains elusive. This study seeks to determine whether mechanical filtering from conversion of lower-limb muscle activity to body sway, during standing balance, can be used to attenuate sway while maintaining biphasic lower-limb muscle responses using frequency-limited stochastic vestibular stimulation (SVS). We hypothesized that SVS deprived of frequencies <2 Hz would evoke biphasic muscle responses with minimal whole-body sway due to mechanical filtering of the higher-frequency muscle responses. Subjects were exposed to five stimulus bandwidths: two meant to induce sway responses (0–1 and 0–2 Hz) and three to dissociate vestibular-evoked muscle responses from whole-body sway (0–25, 1–25, and 2–25 Hz). Two main results emerged: 1) SVS-related sway was attenuated when frequencies <2 Hz were excluded, whereas multiphasic muscle and force responses were retained; and 2) the gain of the estimated transfer functions exhibited successive low-pass filtering of vestibular stimuli during conversion to muscle activity, anteroposterior (AP) moment, and sway. This successive low-pass filtering limited the transfer of signal power to frequencies <20 Hz in muscle activity, <5 Hz in AP moment, and <2 Hz in AP trunk sway. Consequently, the present results show that SVS delivered at frequencies >2 Hz to standing humans do not cause a destabilizing whole-body sway response but are associated with the typical biphasic lower-limb muscle responses.

4 Case Reports On Patients with Acute Lower Limb Muscle Weakness Treated by Spinal Mobilization With Leg Movement(SMWLM) Combined with Korean Medicine Treatment

2020 ◽  
Vol 15 (2) ◽  
pp. 63-73
Author(s):  
Young-Joo Moon ◽  
Won-Bin Shin ◽  
Gwang-Hyun Ryu ◽  
Ji-Yun Lee ◽  
Hyun-A Jeon ◽  
...  
Keyword(s):  
Muscle Weakness ◽  
Lower Limb ◽  
Case Reports ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Korean Medicine ◽  
Leg Movement

scholarly journals Reduced Lower-Limb Muscle Strength and Volume in Patients With Type 2 Diabetes in Relation to Neuropathy, Intramuscular Fat, and Vitamin D Levels

Diabetes Care ◽  
2016 ◽  
Vol 39 (3) ◽  
pp. 441-447 ◽  
Author(s):  
Monirah M. Almurdhi ◽  
Neil D. Reeves ◽  
Frank L. Bowling ◽  
Andrew J.M. Boulton ◽  
Maria Jeziorska ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Vitamin D ◽  
Muscle Strength ◽  
Lower Limb ◽  
Intramuscular Fat ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Vitamin D Levels

scholarly journals Effects of Dominant and Nondominant Limb Immobilization on Muscle Activation and Physical Demand during Ambulation with Axillary Crutches

2021 ◽  
Vol 6 (1) ◽  
pp. 16
Author(s):  
Kara B. Bellenfant ◽  
Gracie L. Robbins ◽  
Rebecca R. Rogers ◽  
Thomas J. Kopec ◽  
Christopher G. Ballmann
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Weight Bearing ◽  
Lower Limbs ◽  
Medial Gastrocnemius ◽  
Bipedal Walking ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Physical Demand ◽  
Limb Dominance

The purpose of this study was to investigate the effects of how limb dominance and joint immobilization alter markers of physical demand and muscle activation during ambulation with axillary crutches. In a crossover, counterbalanced study design, physically active females completed ambulation trials with three conditions: (1) bipedal walking (BW), (2) axillary crutch ambulation with their dominant limb (DOM), and (3) axillary crutch ambulation with their nondominant limb (NDOM). During the axillary crutch ambulation conditions, the non-weight-bearing knee joint was immobilized at a 30-degree flexion angle with a postoperative knee stabilizer. For each trial/condition, participants ambulated at 0.6, 0.8, and 1.0 mph for five minutes at each speed. Heart rate (HR) and rate of perceived exertion (RPE) were monitored throughout. Surface electromyography (sEMG) was used to record muscle activation of the medial gastrocnemius (MG), soleus (SOL), and tibialis anterior (TA) unilaterally on the weight-bearing limb. Biceps brachii (BB) and triceps brachii (TB) sEMG were measured bilaterally. sEMG signals for each immobilization condition were normalized to corresponding values for BW.HR (p < 0.001) and RPE (p < 0.001) were significantly higher for both the DOM and NDOM conditions compared to BW but no differences existed between the DOM and NDOM conditions (p > 0.05). No differences in lower limb muscle activation were noted for any muscles between the DOM and NDOM conditions (p > 0.05). Regardless of condition, BB activation ipsilateral to the ambulating limb was significantly lower during 0.6 mph (p = 0.005) and 0.8 mph (p = 0.016) compared to the same speeds for BB on the contralateral side. Contralateral TB activation was significantly higher during 0.6 mph compared to 0.8 mph (p = 0.009) and 1.0 mph (p = 0.029) irrespective of condition. In conclusion, limb dominance appears to not alter lower limb muscle activation and walking intensity while using axillary crutches. However, upper limb muscle activation was asymmetrical during axillary crutch use and largely dependent on speed. These results suggest that functional asymmetry may exist in upper limbs but not lower limbs during assistive device supported ambulation.

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