scholarly journals Lower-Limb Muscle Excitation, Peak Torque, and External Load Responses to a 120-Minute Treadmill-Based Soccer-Specific Simulation

2020 ◽  
pp. 1-11
Author(s):  
Adam Field ◽  
Richard Michael Page ◽  
Liam Corr ◽  
Robert Naughton ◽  
Matthew Haines ◽  
...  
Keyword(s):  
Lower Limb ◽  
External Load ◽  
Peak Torque ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Excitation Peak

Relationship Between Lower Limb Muscle Strength and Future Falls Among Community-Dwelling Older Adults With No History of Falls: A Prospective 1-Year Study

2020 ◽  
pp. 073346482093277 ◽  
Author(s):  
Jaqueline Mello Porto ◽  
Luciana Mendes Cangussu-Oliveira ◽  
Renato Campos Freire Júnior ◽  
Flávio Tavares Vieira ◽  
Luana Letícia Capato ◽  
...  
Keyword(s):  
Older Adults ◽  
Muscle Strength ◽  
Lower Limb ◽  
Peak Torque ◽  
Community Dwelling ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Monthly Basis ◽  
History Of ◽  
Community Dwelling Older Adults

Objective: To investigate whether lower limb muscle strength could be a risk factor for the first fall among nonfaller community-dwelling older adults. Method: Hip, knee, and ankle peak torque (PT) was measured with an isokinetic dynamometer in 101 older adults with no history of falls in the previous year. Next, the authors followed up the participants on a monthly basis by telephone contact to determine the occurrence of fall episodes over a period of 1 year. Multivariate logistic regression adjusted for confounding variables was applied to assess the relationship between falls and lower limb PT. Results: there was no association between lower limb PT and future falls ( p > .05). Conclusion: Based on these results, it is important to identify other factors that predispose older adults with no history of falls to falling for the first time, so that early and effective preventive strategies may be elaborated.

Lower limb muscle and joint forces during front and back squats performed on a smith machine

2020 ◽  
pp. 1-11
Author(s):  
Rodrigo Bini ◽  
Megan Lock ◽  
Gedd Hommelhoff
Keyword(s):  
Knee Joint ◽  
Lower Limb ◽  
External Load ◽  
Compressive Force ◽  
Gluteus Medius ◽  
Body Motion ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Back Squat ◽  
Joint Forces

BACKGROUND: Comparison of knee loads on a Smith machine, which utilised in for maintenance of health and rehabilitation, has not been attempted. OBJECTIVE: This study compared lower limb muscle and knee joint forces during front and back squats performed on a Smith Machine. METHODS: Eleven participants performed front and back squats with loads at 40%, 60% and 80% of their back squat 1-RMs. Ground reaction forces and three-dimensional full body motion were collected and used for modelling lower limb muscle and knee joint forces. RESULTS: Larger loads increased tibiofemoral compressive force during back squat at 80% compared to 40% (p< 0.01; d= 1.58) and to 60% (p< 0.01; d= 1.37). Patellofemoral compressive (p= 0.96) and tibiofemoral shear forces (p= 0.55) were not influenced by external load or type of squat. Gluteus medius and minimus produced more force at 80% compared to 60% (p= 0.01; d= 1.10) and to 40% (p< 0.01; d= 1.87) without differences for other muscles (p= 0.09–0.91). CONCLUSIONS: Greater external load was associated with increase in gluteus medius and minimus force and with increased tibiofemoral compressive force without effects on tibiofemoral shear force, patellofemoral compressive force or other lower limb muscle forces.

scholarly journals Clinical Screening for Lower Limb Muscle Weakness in Community-Dwelling Older Women

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 230-230
Author(s):  
Daniela Abreu ◽  
Jaqueline Porto
Keyword(s):  
Muscle Strength ◽  
Older Women ◽  
Lower Limb ◽  
Peak Torque ◽  
Community Dwelling ◽  
Step Test ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Small Magnitude ◽  
Clinical Screening

Abstract The objective of the present study was to evaluate the ability of the five times sit to stand test (5TSST), grip strength (GS) and step test (ST) to detect older women with reduced lower-limb muscle strength (LLMS), and to investigate the clinical usefulness of the combination of such tests. One hundred and nineteen older women were submitted to the 5TSST, GS, ST and lower limb peak torque by an isokinetic dynamometer. The capacity of the clinical tests to detect older women with reduced LLMS was measured using the ROC curve, followed by calculation of posttest probability (PoTP). The results show that a ST score of 0.24 cm per cm of participant’s height shows the best PoTP for a positive test (72%). However, the combination of the ST and 5TSST enhances the accuracy from 48% (prevalence of weakness in the population) to 82.6% if both tests are positive, and decreases the PoTP from 48% to 11.4% if both tests are negative. The inclusion of GS provided additional benefits of small magnitude. In conclusion, the ST performed alone or in combination with 5TSST could be an alternative for clinical screening of LLMS reduction in older women. The early identification of impairment of lower-limb muscle strength in independent older adults may favor early intervention and prevention of negative outcomes such as falls and functional limitations.

scholarly journals Lower-Limb Muscle Strength, Anterior-Posterior and Inter-Limb Asymmetry in Professional, Elite Academy and Amateur Soccer Players

2021 ◽  
Vol 77 (1) ◽  
pp. 135-146
Author(s):  
Marco Beato ◽  
Damien Young ◽  
Adam Stiff ◽  
Giuseppe Coratella
Keyword(s):  
Muscle Strength ◽  
Injury Prevention ◽  
Lower Limb ◽  
Peak Torque ◽  
Soccer Players ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Cross Sectional ◽  
Strength Asymmetry ◽  
And Performance

Abstract Given the importance of the lower-limb strength and strength balance in soccer players and its relationship with injury prevention and performance, the present study compared quadriceps and hamstrings strength, the conventional (Hconc:Qconc), functional (Hecc:Qconc) hamstrings-to-quadriceps ratio and inter-limb strength asymmetry in professional, elite academy and amateur male soccer players. In this cross-sectional study, two hundred-six soccer players (professional = 75, elite academy = 68, amateurs = 63) volunteered to participate. Quadriceps and hamstrings isokinetic peak torque was investigated at 60° .s-1 in both the concentric and eccentric modality and at 300°.s-1 in the concentric modality. The conventional Hconc:Qconc, functional Hecc:Qconc ratio and quadriceps and hamstrings inter-limb strength asymmetry were then calculated. Professional players presented greater quadriceps and hamstrings strength than elite academy (effect size from small to moderate) and amateur players (moderate to very large). Both the conventional Hconc:Qconc and functional Hecc:Qconc ratio were greater in professional than elite academy and amateur players (small to moderate). Overall, quadriceps and hamstrings inter-limb strength asymmetry was greater in amateurs than professional (small to very large) and elite academy (trivial to large) players. The present findings provide coaches and medical staffs with normative lower-limb muscle strength data on professional, academy and amateur soccer players. Overall lower-limb muscle strength and inter-limb strength asymmetry could be used to evaluate possible inference on injury prevention and performance. The hamstrings-to-quadriceps ratio poorly differentiates between the soccer players background and offers limited prediction for injury prevention and performance.

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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