scholarly journals The effect of the standing angle on reducing fatigue among prolonged standing workers

Work ◽  
2021 ◽  
Vol 68 (s1) ◽  
pp. S281-S287
Author(s):  
Zhihui Liu ◽  
Li Wang ◽  
Fanlei Kong ◽  
Xia Huang ◽  
Zhi Tang ◽  
...  
Keyword(s):  
Lower Limb ◽  
Self Regulation ◽  
Sampling Point ◽  
Prolonged Standing ◽  
Plantar Pressures ◽  
Lower Limb Muscles ◽  
Long Time ◽  
Foot Pad ◽  
Information Change ◽  
The Relationship

BACKGROUND: Many occupations require workers to stand for prolonged periods, which can cause discomfort, pain and even injures. Some supermarkets in life provide a foot pad for checkout staff to let them stand on it at work, thereby reducing standing fatigue caused by standing for a long time. The inclined platform is the same as the foot pad mentioned above. That is, the staff stepped on it and relieved standing fatigue to a certain extent. OBJECTIVE: The study aims to analyze how the standing angle affects fatigue among prolonged standing workers and tries to find an inclined platform with a specific angle to reduce standing fatigue. METHODS: This experiment studied fatigue of the inclined platforms with different angles on prolonged standing workers, eight participants were selected to participate in the test. The plantar pressures and sEMG (Surface Electromyography) were used to collect the physiological information change of prolonged standing participants in the lower limb and waist. The visual analogue scale was used as a subjective method to measure the psychological fatigue. RESULTS AND CONCLUSION: The study highlights the relationship between standing angle and lower limb fatigue. The inclination of the standing platform has different effects on the participants under different time conditions. When participants stand on inclined platforms at 0°, 5° and 10°, the iEMG (Integrated Electromyography) values of the gastrointestinal muscle were not significantly different until the third sampling point (40 minutes). After that self-regulation of lower limb muscles is better when standing on an inclined platform between 5° and 10°, it has a certain effect on alleviating lower limb fatigue. This knowledge is crucial for the design of the inclined working platforms fitting the needs of prolonged standing workers.

scholarly journals Muscle forces and the demands of human walking

Biology Open ◽  
2021 ◽  
Vol 10 (7) ◽  
Author(s):  
Adam D. Sylvester ◽  
Steven G. Lautzenheiser ◽  
Patricia Ann Kramer
Keyword(s):  
Lower Limb ◽  
Reaction Force ◽  
The Body ◽  
Muscle Forces ◽  
Skeletal Morphology ◽  
Lower Limb Muscles ◽  
Fossil Hominins ◽  
Force Curves ◽  
Behavior Function ◽  
The Relationship

ABSTRACT Reconstructing the locomotor behavior of extinct animals depends on elucidating the principles that link behavior, function, and morphology, which can only be done using extant animals. Within the human lineage, the evolution of bipedalism represents a critical transition, and evaluating fossil hominins depends on understanding the relationship between lower limb forces and skeletal morphology in living humans. As a step toward that goal, here we use a musculoskeletal model to estimate forces in the lower limb muscles of ten individuals during walking. The purpose is to quantify the consistency, timing, and magnitude of these muscle forces during the stance phase of walking. We find that muscles which act to support or propel the body during walking demonstrate the greatest force magnitudes as well as the highest consistency in the shape of force curves among individuals. Muscles that generate moments in the same direction as, or orthogonal to, the ground reaction force show lower forces of greater variability. These data can be used to define the envelope of load cases that need to be examined in order to understand human lower limb skeletal load bearing.

scholarly journals Asymmetry and Tightness of Lower Limb Muscles in Equestrian Athletes: Are They Predictors for Back Pain?

Symmetry ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 1679 ◽  
Author(s):  
Antonio Cejudo ◽  
Angélica Ginés-Díaz ◽  
Pilar Sainz de Baranda
Keyword(s):  
Back Pain ◽  
High Risk ◽  
Lower Limb ◽  
Knee Flexion ◽  
Operating Characteristic ◽  
Binary Logistic Regression ◽  
Optimal Cutoff ◽  
Receiver Operating Characteristic Curves ◽  
Lower Limb Muscles ◽  
The Relationship

Athletes may suffer from low back pain (LBP). Some studies have considered restricted range of motion (ROM) as a risk factor for LBP in athletes; however, ROM has not been evaluated in equestrian athletes (EAs) with LBP. The aims of this research in EAs were (I) to analyze the relationship between lower limb ROM (tightness and asymmetry) and LBP and (II) to determine the reference values for lower limb ROM indicating high risk of LBP. Forty-three young (9–18 years old) EAs were voluntarily recruited in technical training camps. The EAs were assessed for 11 passive lower limb ROMs using the ROM-SPORT I Battery. LBP data were taken at the end of a 1-year period through a questionnaire. Binary logistic regression and receiver operating characteristic curves were calculated. Sixty-seven percent of EA had suffered LBP. Hip adduction (OR = 1.347, medium; p = 0.015) and knee flexion (OR = 1.109, small; p = 0.023) were predictors of LBP in EAs. A hip adduction of 26° and knee flexion of 128° were found to be the optimal cutoff values for predictive screening of EAs at high risk of LBP.

scholarly journals Investigation of Lower Limb Fatigue on Two Standing Posture

2016 ◽  
Vol 11 (1) ◽  
pp. 208 ◽  
Author(s):  
Sari Julia Sartika ◽  
Siti Zawiah Dawal
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Lower Limb ◽  
Muscle Activity ◽  
Surface Emg ◽  
Sorting Task ◽  
Low Back ◽  
Standing Posture ◽  
Prolonged Standing ◽  
Lower Limb Muscles

The purpose of this study was to investigate the different effect from the two standing posture on lower limb fatigue and discomfort. Sixteen subjects (eight females and eight males), aged between 23-29 years, participated in the experiment. They performed a sorting task in front of a grading table by picking and placing objects for 90 minutes in two posture (1) standing and (2) standing using a footrest. Muscle activity was recorded with surface EMG through disposable electrodes. The result shows that standing for ninety minutes developed fatigue in lower limb muscles and back muscles that lead to low back pain. Standing using a footrest result proper posture for prolonged standing period and reduce force at the back. It also results less fatigue and reduce the %MVC of EMG. So, it is recommended to attach a footrest in standing workstation to reduce the fatigue and discomfort.Keywords:fatigue, posture, standing,lower limb, EMG

The relationship between time of swim start and the power of the lower limbs among young swimmers

2018 ◽  
Vol 28 (81) ◽  
pp. 57-68
Author(s):  
Łukasz Wądrzyk ◽  
Robert Staszkiewicz
Keyword(s):  
Lower Limb ◽  
Lower Limbs ◽  
Maximal Power ◽  
Hip Joints ◽  
Squat Jump ◽  
Lower Limb Muscles ◽  
Counter Movement Jump ◽  
Maximal Speed ◽  
Loss Of Contact ◽  
The Relationship

Aim: Determining the relationship between time of swim start and the power of the lower limbs in boys and girls. Basic procedures: 32 swimmers, aged 15-16 years performed the CMJ (counter-movement jump) and the SJ (squat jump). The following were measured: jump height (H), maximal speed (vMAX) and maximal power as well as the average in absolute (respectively: P and PA) and relative terms (PREL and PAREL). Registration Recording of the start jumps to any style freestyle with the measurement of the time to cover the first 10 m of the distance was were conducted (t10). The following were determined: flight length and time (Lf, tf), height of hip joints at the time of start signal (Hh), angle in of the hip joints at the time of loss of contact with the block (AT) as well as at the time of immerging fingers in the water (AE), and the water attack angle (AA). The significance of differences between averages noted in the groups of boys and girls were evaluated and the correlations between variables were described. Main findings: The boys achieved lower t10 values and higher Lf, Hh and AT levels. In this group of subjects, only Hh negatively correlated with t10 (r=-0.57). Significant differences in the level of all variables noted for the boys and girls during the CMJ and SJ were observed. At the same time, none of the indicators characterizing CMJ were correlated with t10. In the group of boys, significant correlations were noted between t10 and H, vMAX, P, PREL, PA in SJ (-0.51≤r≤-0.72). Conclusions: There are differences between the boys and girls in performance of the start jump. One of their causes may be the disproportion in the strength of lower limb muscles. In boys, unlike girls, the SJ jump is valuable in testing the power of the lower limbs significantly correlated with the effectiveness of the start jump. The CMJ jump seems to be of low usefulness in predicting the effectiveness of a swim start.

Ventilatory threshold is related to walking tolerance in patients with intermittent claudication

VASA ◽  
2012 ◽  
Vol 41 (4) ◽  
pp. 275-281 ◽  
Author(s):  
da Rocha Chehuen ◽  
G. Cucato ◽  
P. dos Anjos Souza Barbosa ◽  
A. R. Costa ◽  
M. Ritti-Dias ◽  
...  
Keyword(s):  
Blood Flow ◽  
Oxygen Uptake ◽  
Intermittent Claudication ◽  
Lower Limb ◽  
Ventilatory Threshold ◽  
Reactive Hyperemia ◽  
Ankle Brachial Index ◽  
Metabolic Parameters ◽  
Walking Distance ◽  
The Relationship

Background: This study assessed the relationship between lower limb hemodynamics and metabolic parameters with walking tolerance in patients with intermittent claudication (IC). Patients and methods: Resting ankle-brachial index (ABI), baseline blood flow (BF), BF response to reactive hyperemia (BFRH), oxygen uptake (VO2), initial claudication distance (ICD) and total walking distance (TWD) were measured in 28 IC patients. Pearson and Spearman correlations were calculated. Results: ABI, baseline BF and BF response to RH did not correlate with ICD or TWD. VO2 at first ventilatory threshold and VO2peak were significantly and positively correlated with ICD (r = 0.41 and 0.54, respectively) and TWD (r = 0.65 and 0.71, respectively). Conclusions: VO2peak and VO2 at first ventilatory threshold, but not ABI, baseline BF and BFHR were associated with walking tolerance in IC patients. These results suggest that VO2 at first ventilatory threshold may be useful to evaluate walking tolerance and improvements in IC patients.

The Problem of Identifying and Modeling the Relationship between Monetary Factor and Inflation in the Russian Economy

2008 ◽  
pp. 61-76
Author(s):  
A. Porshakov ◽  
A. Ponomarenko
Keyword(s):  
Money Supply ◽  
Money Demand ◽  
Russian Economy ◽  
Long Run ◽  
Complex Approach ◽  
Wide Range ◽  
Long Time ◽  
The Relationship ◽  
Supply Side Factors

The role of monetary factor in generating inflationary processes in Russia has stimulated various debates in social and scientific circles for a relatively long time. The authors show that identification of the specificity of relationship between money and inflation requires a complex approach based on statistical modeling and involving a wide range of indicators relevant for the price changes in the economy. As a result a model of inflation for Russia implying the decomposition of inflation dynamics into demand-side and supply-side factors is suggested. The main conclusion drawn is that during the recent years the volume of inflationary pressures in the Russian economy has been determined by the deviation of money supply from money demand, rather than by money supply alone. At the same time, monetary factor has a long-run spread over time impact on inflation.

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