scholarly journals Evaluation of Lower Limb Muscle Electromyographic Activity during 400 m Indoor Sprinting among Elite Female Athletes: A Cross-Sectional Study

2021 ◽  
Vol 18 (24) ◽  
pp. 13177
Author(s):  
Przemysław Pietraszewski ◽  
Artur Gołaś ◽  
Michał Krzysztofik ◽  
Marta Śrutwa ◽  
Adam Zając
Keyword(s):  
Lower Limb ◽  
Vastus Lateralis ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Gastrocnemius Medialis ◽  
Lower Limb Muscles ◽  
Semg Signals

The purpose of this cross-sectional study was to analyze changes in normalized surface electromyography (sEMG) signals for the gastrocnemius medialis, biceps femoris, gluteus maximus, tibialis anterior, and vastus lateralis muscles occurring during a 400 m indoor sprint between subsequent curved sections of the track. Ten well-trained female sprinters (age: 21 ± 4 years; body mass: 47 ± 5 kg; body height: 161 ± 7 cm; 400 m personal best: 52.4 ± 1.1 s) performed an all-out 400 m indoor sprint. Normalized sEMG signals were recorded bilaterally from the selected lower limb muscles. The two-way ANOVA (curve × side) revealed no statistically significant interaction. However, the main effect analysis showed that normalized sEMG signals significantly increased in subsequent curves run for all the studied muscles: gastrocnemius medialis (p = 0.003), biceps femoris (p < 0.0001), gluteus maximus (p = 0.044), tibialis anterior (p = 0.001), and vastus lateralis (p = 0.023), but differences between limbs were significant only for the gastrocnemius medialis (p = 0.012). The results suggest that the normalized sEMG signals for the lower limb muscles increased in successive curves during the 400 m indoor sprint. Moreover, the gastrocnemius medialis of the inner leg is highly activated while running curves; therefore, it should be properly prepared for high demands, and attention should be paid to the possibility of the occurrence of a negative adaptation, such as asymmetries.

Latent trigger points in lower limb muscles in sedentary and athletic subjects. A cross-sectional study on prevalence

Physiotherapy ◽  
2016 ◽  
Vol 102 ◽  
pp. e209-e210
Author(s):  
A. Gomez-Conesa ◽  
J.C. Zuil-Escobar ◽  
C.B. Martínez-Cepa ◽  
J.A. Martín-Urrialde
Keyword(s):  
Lower Limb ◽  
Trigger Points ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Lower Limb Muscles ◽  
Limb Muscles

scholarly journals Comparison of Muscle Activity During 200 m Indoor Curve and Straight Sprinting in Elite Female Sprinters

2021 ◽  
Vol 80 (1) ◽  
pp. 309-316
Author(s):  
Przemysław Pietraszewski ◽  
Artur Gołaś ◽  
Michał Krzysztofik
Keyword(s):  
Vastus Lateralis ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Lower Limbs ◽  
Experimental Conditions ◽  
Gastrocnemius Medialis ◽  
Lower Limb Muscles ◽  
Subject Design ◽  
Leg Muscle ◽  
The Right

Abstract The purpose of this study was to assess whether peak surface electromyography (sEMG) amplitude of selected lower limb muscles differed during a) curve and straight sprinting, b) sprinting in inside and outside lanes between lower limbs. Eleven well-trained female sprinters (personal best: 24.1 ± 1.1 s) were included in a randomized within-subject design study, in which participants underwent two experimental conditions: all-out 200 m indoor sprints in the innermost and outermost lane. Peak sEMG amplitude was recorded bilaterally from gastrocnemius medialis, biceps femoris, gluteus maximus, tibialis anterior, and vastus lateralis muscles. Left gastrocnemius medialis peak sEMG amplitude was significantly higher than for the right leg muscle during curve (p = 0.011) and straight sprinting (p < 0.001) when sprinting in the inside lane, and also significantly higher when sprinting in the inside vs. outside lane for both curve and straight sprinting (p = 0.037 and p = 0.027, respectively). Moreover, left biceps femoris peak sEMG amplitude was significantly higher during straight sprinting in the inside vs. outside lane (p = 0.006). Furthermore, right and left vastus lateralis peak sEMG amplitude was significantly higher during curve sprinting in the inside lane (p = 0.001 and p = 0.004, respectively) and for the left leg muscle peak sEMG amplitude was significantly higher during curve compared to straight sprinting in the outside lane (p = 0.024). Results indicate that curve sprinting creates greater demands mainly for the gastrocnemius medialis of the inner than the outer leg, but the degree of these requirements seems to depend on the radius of the curve, thus significant changes were noted during sprinting in the inside lane, but not in the outside lane.

scholarly journals Relationship between lower-limb muscle strength and functional independence among elderly people according to frailty criteria: a cross-sectional study

2014 ◽  
Vol 132 (5) ◽  
pp. 282-289 ◽  
Author(s):  
Fernanda Sotello Batista ◽  
Grace Angélica de Oliveira Gomes ◽  
Maria José D'Elboux ◽  
Fernanda Aparecida Cintra ◽  
Anita Liberalesso Neri ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Lower Limb ◽  
Functional Independence ◽  
Cross Sectional Study ◽  
Limb Muscle ◽  
Sectional Study ◽  
Cross Sectional ◽  
Elderly Outpatients ◽  
The Mean ◽  
Frailty Criteria

CONTEXT AND OBJECTIVE: Muscle strength and functional independence are considered to be determinants of frailty levels among elderly people. The aim here was to compare lower-limb muscle strength (LLMS) with functional independence in relation to sex, age and number of frailty criteria, and to ascertain the influence of these variables on elderly outpatients' independence.DESIGN AND SETTING: Quantitative cross-sectional study, in a tertiary hospital.METHODS: The study was conducted on 150 elderly outpatients of both sexes who were in a cognitive condition allowing oral communication, between October 2005 and October 2007. The following instruments were used: five-times sit-to-stand test (FTSST), Functional Independence Measurement (FIM) and Lawton's Instrumental Activities of Daily Living Scale (IADL). Descriptive, comparative, multivariate, univariate and Cronbach alpha analyses were performed.RESULTS: The mean time taken in the FTSST was 21.7 seconds; the mean score for FIM was 82.2 and for IADL was 21.2; 44.7% of the subjects presented 1-2 frailty criteria and 55.3% > 3 criteria. There was a significant association between LLMS and functional independence in relation to the number of frailty criteria, without homogeneity regarding sex and age. Functional independence showed significant influence from sex and LLMS.CONCLUSION: Elderly individuals with 1 or 2 frailty criteria presented greater independence in all FTSST scores. The subjects with higher LLMS presented better functional independence.

scholarly journals Strength of the lower limb and trunk muscles is associated with gait speed in individuals with sub-acute stroke: a cross-sectional study

2018 ◽  
Vol 22 (6) ◽  
pp. 459-466 ◽  
Author(s):  
Larissa Tavares Aguiar ◽  
Ludimylla Brennar Alves Camargo ◽  
Lorena Dasdores Estarlino ◽  
Luci Fuscaldi Teixeira-Salmela ◽  
Christina Danielli Coelho de Morais Faria
Keyword(s):  
Acute Stroke ◽  
Lower Limb ◽  
Gait Speed ◽  
Cross Sectional Study ◽  
Trunk Muscles ◽  
Sectional Study ◽  
Cross Sectional

scholarly journals TL 18165 - Relationship between lower limb dysmetria and plantar fasciitis

2019 ◽  
Vol 13 (Supl 1) ◽  
pp. 96S
Author(s):  
Henrique Mansur ◽  
Guilherme Gonçalves Feijó Carvalho ◽  
Isnar Moreira de Castro Júnior
Keyword(s):  
Lower Limb ◽  
Plantar Fasciitis ◽  
Plantar Fascia ◽  
Cross Sectional Study ◽  
Lower Limbs ◽  
Sectional Study ◽  
Cross Sectional ◽  
Calcaneal Spur ◽  
The Mean ◽  
The Relationship

Introduction: Plantar fasciitis is an inflammatory process of multifactorial etiology that affects the origin of the plantar fascia and surrounding structures. A difference in length between lower limbs is relatively common within the population and can sometimes cause changes in biomechanics and symptoms. The objective of this study is to evaluate the relationship between lower limb dysmetria and plantar fasciitis. Methods: A cross-sectional study was performed to measure the length of the lower limbs by scanometry in patients diagnosed with plantar fasciitis. Other risk factors, such as body mass index, foot shape and the presence of plantar calcaneal spur, were also assessed in foot radiographs. Results: Of the 54 patients included in the study, 44.4% were men, and the mean age was 50.38 (23-73 years); 81.5% had pain in one foot, and 53.7% had feet that were considered plantigrade. We observed dysmetria in 88.9% of the sample, with a mean of 0.749 cm (SD ±0.63). In addition, 46.3% feet with pain showed calcaneal spurs on the radiographs. Conclusion: Approximately 90% of patients showed lower-limb dysmetria and, in most cases, the side with the shorter limb was affected by plantar fasciitis

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