scholarly journals Associations between lower-limb muscle activation and knee flexion in post-stroke individuals: A study on the stance-to-swing phases of gait

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0183865 ◽  
Author(s):  
Wei Wang ◽  
Ke Li ◽  
Shouwei Yue ◽  
Cuiping Yin ◽  
Na Wei
Keyword(s):  
Lower Limb ◽  
Knee Flexion ◽  
Muscle Activation ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Post Stroke

scholarly journals Investigation the EMG Activities of Lower Limb Muscles When Doing Squatting Exercise in Water and on Land

2019 ◽  
Vol 16 (22) ◽  
pp. 4562 ◽  
Author(s):  
Calvin H.N. Yuen ◽  
Christine P.Y. Lam ◽  
Kate C.T. Tong ◽  
Jessica C.Y. Yeung ◽  
Chloe H.Y. Yip ◽  
...  
Keyword(s):  
Knee Pain ◽  
Lower Limb ◽  
Knee Flexion ◽  
Muscle Activation ◽  
Water Medium ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Kinetic Chain ◽  
Significant Difference ◽  
Closed Kinetic Chain

(1) Background: Squatting is one of the common closed-kinetic chain (CKC) exercises for knee rehabilitation. Some patients cannot perform squatting exercises on land occasionally due to knee pain. Several studies had suggested that lower limb muscle activities are lower in water than on land while performing CKC exercises. The purpose of this study is to investigate the surface electromyography (sEMG) activities of Rectus femoris (RF) and Biceps femoris (BF) muscles when doing a squatting exercise in water and on land. (2) Methods: This was a cross-sectional experimental study. A total of 20 healthy participants (10 males, 10 females) were recruited by convenience sampling. The sEMG of RF and BF muscles in water and on land were collected and the knee motions were videotaped. Participants were instructed to perform closed kinetic-chain back squatting exercises at a specific speed (30 beats per minute) in water and on land at angular speed of 45°/s. Eight repetitions of the squatting exercise (0–90° knee flexion) were performed. The mean percentage maximal voluntary contraction (%MVC) between two muscles was compared in two conditions. The %MVC of RF and BF muscles at different specific knee flexion angles (30°, 60° and 90° knee flexion) was also identified. (3) Result: Muscle activities of RF (p = 0.01) and BF (p < 0.01) muscles were significantly lower in water than on land. The %MVC of RF and BF muscles was found to be 15.01% and 10.68% lower in water than on land respectively. For different knee angle phases, the differences in %MVC between land and water had significant difference for both RF muscles and BF muscles. (4) Conclusion: This study found a difference of mean percentage MVC of RF and BF muscles between land and water in different phases of squatting. The water medium reduced the two muscles’ activities to a similar extent. The result showed that the aquatic environment allows an individual to perform squatting with less muscle activation which may serve as an alternative knee exercise option for patients who encounter difficulty in land squatting due to lower limb muscle weakness or a high level of knee pain.

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.

Lower limb muscle activation patterns in ice-hockey skating and associations with skating speed

2021 ◽  
pp. 1-16
Author(s):  
Sami Kaartinen ◽  
Mika Venojärvi ◽  
Kim J Lesch ◽  
Heikki Tikkanen ◽  
Paavo Vartiainen ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Ice Hockey ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Activation Patterns ◽  
Muscle Activation Patterns

A comparison of lower limb muscle activation pattern using voluntary response index between pronated and normal foot structures during forward jump landing

2018 ◽  
Vol 22 (2) ◽  
pp. 379-384
Author(s):  
Hosein Kouhzad Mohammadi ◽  
Mohammad Mehravar ◽  
Khosro Khademi Kalantari ◽  
Sedighe Sadat Naimi ◽  
Alireza Akbarzadeh Baghban ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Activation Pattern ◽  
Muscle Activation Pattern ◽  
Response Index ◽  
Jump Landing ◽  
Voluntary Response

Comparison of lower limb muscle activation during downhill, level and uphill running

2010 ◽  
Vol 18 (3) ◽  
pp. 163-168 ◽  
Author(s):  
Zong-Yan Cai ◽  
Cheng-Chen Hsu ◽  
Chin-Peng Su ◽  
Chin-Fan Lin ◽  
Yi-An Lin ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Lower Limb Muscle ◽  
Limb Muscle
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