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Tytuł:
Correlations between somatic features, anteroposterior spinal curvatures and trunk muscle strength in schoolchildren
Autorzy:
Barczyk-Pawelec, K.
Dziubek, W.
Piechura, J. R.
Rożek, K.
Powiązania:
https://bibliotekanauki.pl/articles/307173.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
krzywizna kręgosłupa
fotogrametria
postura
siła mięśni
spinal curvatures
photogrammetry
posture
muscle strength
Opis:
Background: Evaluation of body posture and strength of spinal muscles in children during their progressive ontogenesis is significant for the evaluation of their physical health condition and physical fitness. It is also a reference point in a process of control and medical care. Purpose: The aim if this study was to evaluate correlation between the selected features of somatic body structure, shape of anteroposterior spinal curves and force-velocity (FV) parameters of trunk muscles in school children. Participants and methods: The sample involved 104 children aged 10–11 years, 60 females (10.74 ± 0.7) and 44 males (10.50 ± 0.9). Body posture was assessed using the Moiré photogrammetry while trunk muscles (flexors and extensors) strength was measured isokinetically. Results: The results of the research revealed the existence of many average and strong correlations observed between the analysed somatic characteristics and forcevelocity (FV) parameters of trunk muscles. Correlation between the volume of the spinal curvatures in the sagittal plane and forcevelocity parameters of trunk extensors and flexors were average or weak for both groups of children. Conclusion: Somatic features indicated stronger correlation with trunk muscles' strength than with the size of the anteroposterior spinal curves.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 1; 133-139
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Handgrip explosive force is correlated with mobility in the elderly women
Autorzy:
Borges, L. S.
Fernandes, M. H.
Schettino, L.
Coqueiro, R. S. da
Pereira, R.
Powiązania:
https://bibliotekanauki.pl/articles/306407.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
starzenie
mobilność
siła mięśni
aging
mobility
maximum muscle strength
Opis:
The analysis of explosive force, through rate of force development (RFD) and contractile impulse (CI), from handgrip strength data seems to be useful and promising information to study the aging of musculoskeletal system and health status. We aimed to test the hypothesis that, in elderly women, the handgrip explosive force could be better associated to the functional mobility than maximum handgrip strength. Handgrip strength and the performance of Timed Up & Go Test (TUG) were measured from sixty-five community-dwelling healthy elderly women. The average slope of the moment–time curve (Δ moment/Δ time) over the time interval of 0–200 ms relative to the onset of contraction was calculated to provide the RFD and CI. The highest strength achieved during the isometric contraction was used as maximum handgrip strength. Pearson correlations were used to assess the strength of the relationship between the handgrip strength parameters (Maximum strength and explosive force from 0–200 ms) and TUG test performance from older women. The correlation analysis showed that the TUG test performance was inversely correlated to the handgrip strength parameters, with better relationship with explosive force parameters. The handgrip explosive force seems to be a promising predictor of functional mobility of elderly women, since it showed a better relationship with functional mobility than maximum handgrip strength.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 3; 145-149
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do different muscle strength levels affect stability during unplanned gait termination?
Autorzy:
Cen, Xuanzhen
Jiang, Xinyan
Gu, Yaodong
Powiązania:
https://bibliotekanauki.pl/articles/306615.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
siła mięśni
chód
ciśnienie podeszwowe
równowaga
muscle power
muscle strength
gait stop
plantar pressure
foot balance
Opis:
Unplanned gait termination (UGT) widely occurs in various sports and daily life as a kind of stress response to unexpected stimulus. However, the body stability may be greatly affected when the body completely stops. The purpose of this study was to examine the association between muscle strength levels and body stability during UGT through comparing the plantar pressure. Methods: Twenty healthy participants (10 male and 10 female) with different lower limbs muscle strength and power were asked to perform planned gait termination (PGT) and unplanned gait termination (UGT) on an 8-m walkway. Related plantar pressure data including maximum pressure, maximum force, contact area and center of pressure were recorded with Footscan pressure platform. Results: Two types of gait termination have significant differences in the plantar pressure distribution. Maximum pressure and maximum force in the lateral metatarsal increased significantly during UGT, compared to PGT. At the same time, data from the current study suggested that there might be a correlation between the muscle strength levels of individual and the stability during the gait termination, especially between the muscle power and UGT, which means that the more excellent muscle power an individual has, the more stable the body is when UGT is performed. Conclusions: The findings suggest that different muscle strength levels could affect stability during unplanned gait termination.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 4; 27-35
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trening sportowy a dysproporcje funkcjonalnemięśni zginaczy i prostowników kolana
Sport training versus function disproportion of knee flexion and extension
Autorzy:
Cieszczyk, P.
Buryta, R.
Kolbowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/789877.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
sport
trening
aktywnosc fizyczna
uklad kostno-miesniowy
staw kolanowy
zginacze stawu kolanowego
sila miesni
testy izokinetyczne
Źródło:
Zeszyty Naukowe. Prace Instytutu Kultury Fizycznej. Uniwersytet Szczeciński; 2006, 23(444)
1640-6818
Pojawia się w:
Zeszyty Naukowe. Prace Instytutu Kultury Fizycznej. Uniwersytet Szczeciński
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromyographic Analysis of a Repetitive Hand Gripping Task
Autorzy:
Cook, T.
Rosecrance, J.
Zimmermann, C.
Gerleman, D.
Ludewig, P.
Powiązania:
https://bibliotekanauki.pl/articles/91061.pdf
Data publikacji:
1998
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
electromyography
cumulative trauma disorders
work-rest cycle
muscle force
hand gripping
elektromiografia
siła mięśni
cykl pracy
kończyna górna
Opis:
Electromyography (EMG) has been proposed as a method for determining muscle effort in repetitive upper limb tasks, which are often related to cumulative trauma disorders. EMG activity of the finger flexor musculature was investigated during a repetitive hand gripping task having 5 different cycle durations (2 to 6 s), various percentage of work time (and rest) within the work cycle (20% to 80%), and 3 different grip force levels. Thirty healthy adult participants each performed 27 randomly ordered 30-s repetitive hand gripping trials as well as 3 isometric contractions, which were used to normalize data from the hand gripping trials. There was a significant decrease in mean EMG as the duration of the work-rest cycle time increased. At each force level, EMG increased as the percentage of work time within the work-rest cycle increased, but to a greater extent at the highest force level. The results of this study suggest that overall muscle effort, and perhaps muscle fatigue, can be reduced most effectively by modifying the force requirements of the repetitive task. Other variables, such as the percentage of work time within a cycle and overall work cycle time have less effect on the EMG activity level. The results of this study have implications for developing strategies to reduce muscle fatigue during repetitive hand gripping tasks in an effort to reduce the effects of cumulative trauma disorders.
Źródło:
International Journal of Occupational Safety and Ergonomics; 1998, 4, 2; 185-198
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isometric Pull and Push Strengths of Paraplegics in the Workspace: 1. Strength Measurement Profiles
Autorzy:
Das, B.
Black, N. L.
Powiązania:
https://bibliotekanauki.pl/articles/90074.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
isometric strength
measurement
pull and push strengths
workspace
reach envelopes
paraplegics
pomiary
ciągnięcie
pchanie
siła mięśni
praca mięśni
Opis:
The isometric strength profiles of male and female paraplegics were determined for pull and push strengths in the normal, maximum, and extreme working reach envelopes. A computerized isometric strength measurement system was designed and constructed for the purpose. The strongest pull location was at extreme reach vertically above the shoulder and the strength values for males and females were 473 and 318 newtons (N), respectively. The strongest push location was at maximum reach, at vertical ($) angle of 45° and at horizontal (6) angle of 45° for males and at 0° for women and the strength values were 235 and 172 N, respectively. The nature of the strength profiles was found to be similar for both the sexes. The pull and push strengths of the female were 77 and 68% that of the male, respectively.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 47-65
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isometric Pull and Push Strengths of Paraplegics in the Workspace: 2. Statistical Analysis of Spatial Factors
Autorzy:
Das, B.
Black, N. L.
Powiązania:
https://bibliotekanauki.pl/articles/89871.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
isometric strength
pull and push strengths
workspace reach levels
horizontal and vertical angles
paraplegics
analiza statystyczna
siła mięśni
praca mięśni
Opis:
The effect of reach levels, horizontal angles, and vertical angles on isometric pull and push strengths of male and female was determined. Highly significant increases in men’s push strength were found between extreme to maximum reaches, and from extreme to normal reaches. However, for women’s push strength, a significant increase was found only between extreme to maximum reach. Significant or highly significant increases were found in men’s and women’s pull strength between the horizontal angle (0) sagittal through the active shoulder (90°) and other angles (0, 45, and 135°). However, for men’s push strength, highly significant increases were found between the horizontal angle 45° from the frontal plane, and other angles. For women’s push strength, significant or highly significant increases were found between the horizontal angles 0° and angles of 90 and 135°. For men’s and women’s pull strength, significant or highly significant increases were found between the vertical angle (), 90°, and other angles (-20, 0, and 45°). Similar increases were found for women’s push strength between the 45° angle and other angles. In the design of a workstation for paraplegics that requires pull and push forces, consideration must be given to the spatial factors.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 67-80
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isometric Pull-Push Strengths in Workspace. 1, Strength Profiles
Autorzy:
Das, B.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/90551.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
isometric strength
push and pull strengths
workspace reach levels
vertical and horizontal angles
workstation design
pchanie
siła mięśni
praca mięśni
pozycja przy pracy
pozycja siedząca
pozycja stojąca
Opis:
The isometric pull and push strength profiles of males and females were determined in seated and standing positions in the workspace. The strongest pull strength location was at extreme reach vertically above the shoulder for both males and females. The greatest pull strength of 400 Newtons (N) for males was recorded in the seated and standing positions. Females. pull strengths in the seated and standing positions were 222 and 244 N, respectively. The strongest push strength was always at the maximum reach at the overhead location. Males. maximum push strength was 227 N in the seated position and 251 N in the standing position. Females’ maximum push strength was 96 N in the seated position and 140 N in the standing position. On the average the strength in the standing position was 79% of the seated position. The push strength was 71% of the pull strength and females were 56% as strong as males.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2004, 10, 1; 43-58
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isometric Pull-Push Strengths in Workspace. 2, Analysis of Spatial Factors
Autorzy:
Das, B.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/90758.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
isometric strength
push and pull strengths
workspace reach levels
vertical and horizontal angles
workstation design
pchanie
siła mięśni
praca mięśni
pozycja przy pracy
pozycja siedząca
pozycja stojąca
projektowanie miejsc pracy
Opis:
The effect of reach levels, horizontal angles and vertical angles on isometric pull and push strengths of males and females in standing and seated positions was determined. The effect of reach levels on strength varied as a consequence of force direction, working position and gender. Reach level has a significant effect on women's pull strength in the seated position and on push strength in the standing position. The strength value was significantly greater in the extreme reach than in maximum or normal reach. Vertical angle ö had a significant effect on strength consistently in all cases. Strength values increased significantly with the increase of ö angles from 0º to 45º to 90º. The horizontal angle è had a significant influence only on the pull strength of standing and seated men and standing women (not seated woman). The maximum strength was significantly greater at è = 90º.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2004, 10, 1; 59-64
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projektowanie koncepcyjne środków transportu na rzecz rekultywacji terenów górniczych
Conceptual design of transportation facility for the mining land reclamation
Autorzy:
Derlukiewicz, D.
Lewandowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/170288.pdf
Data publikacji:
2014
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
rekultywacja terenów górniczych
środki transportu
Creative Design
siła mięśni
reclamation of mining areas
transport means
creative design
muscle forces
Opis:
W artykule zaprezentowano proces projektowania koncepcyjnego na przykładzie projektu środka transportu wykorzystującego siłę mięśni ludzkich. Celem projektu było również zagospodarowanie terenów górniczych. W artykule pokazano źródła inspiracji projektantów oraz wyniki procesu projektowego na przykładzie interdyscyplinarnego projektu „Creative Design”.
The article presents the conceptual design process on the example of the means of transport that use human muscle power. The aim of the project was also to develop the mining areas. The article shows the sources of inspiration for designers and the results of the design process on the example of an interdisciplinary project “Creative Design”.
Źródło:
Górnictwo Odkrywkowe; 2014, 55, 4-5; 260-264
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective utilization of man shift through sustainable workload testing for underground mining machine operators. An ergonomic based man-machine interface approach
Autorzy:
Dey, Netai Chandra
Dey, Shibaji
Powiązania:
https://bibliotekanauki.pl/articles/2064404.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
fatigue sustainability
FS
muscle force
MF
heart rate ratio
HR ratio
exposure time period
ETP
effective utilization of man shift
EUMS
workload simulation
siła mięśni
obciążenie pracą
okres ekspozycji
degradacja zmęczeniowa
tętno
środowiskowe warunki pracy
Opis:
Insight of man-machine interfaces during mining machine operations, better co-ordinance with human efficiencies and suitable workload selection in underground mining machine operation are the main viewpoints of the study. Total 12 side discharge loader (SDL) and load haul dumper (LHD) operators [N = 12] have been taken as participants of the study. The methodology is divided into two parts first part is devoted to measuring and analyzing workload response of machine operation with polar heart rate monitor. Machine operator’s heart rate ratio (HR ratio) for the whole shift is recorded and metabolic rate (MR) has been analyzed. Additionally, fatigue sustainability (FS) and degradation of muscle force (MF) are recorded for each work cycles up to exposure time period (ETP) of 360 minutes. In the second part of the methodology, based on the HR ratio recorded during the mining operation, a workload simulation study is undertaken on a treadmill at the surface following BRUCE protocol. At treadmill, based on HR ratio, workload achieved from mines along with three different workloads i.e. low, moderate and high has been tested. Differences in FS and degradation rate of MF after each workload experiment have been recorded. A result from the underground operational study shows that there is about 43.2% and 32.4% of decreasing MF for SDL and LHD operators after end of spells at mines. Additionally, a negative correlation (r = -0.99) is found between ETP and MF. The workload simulation study shows that there are significant differences between FS (p < 0.05) and MF (p < 0.05) data of mining and treadmill experiment with the same workload. In comparison to an underground operation, FS rate of low, moderate and high workload is recorded 60%, 35%, and 15% higher respectively than of mine workload. Higher FS rate may achieve due to availability of good environment. Among the tested workload only low kind of workload is found suitable for mining machinery job as degradation of MF is found significantly (p < 0.05) low and FS is found significantly (p < 0.01) high in this kind of workload. Therefore, it can be concluded that in mining machinery operation better to adopt low workload for effective utilization of man shift (EUMS) as it gives comparatively low MF degradation and better FS during continuous work.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 394--403
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Job Level Risk Assessment Using Task Level ACGIH Hand Activity Level TLV Scores: A Pilot Study
Autorzy:
Drinkaus, P.
Sesek, R.
Bloswick, D. S.
Mann, C.
Bernard, T.
Powiązania:
https://bibliotekanauki.pl/articles/90591.pdf
Data publikacji:
2005
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
HAL
TLV
hand activity level
multitask
work-related risk assessment
ocena ryzyka zawodowego
choroby narządów ruchu
obciążenie fizyczne
kończyna górna
siła mięśni
ocena sprawności fizycznej
Opis:
Existing upper extremity musculoskeletal disorder analytical tools are primarily intended for single or monotask jobs. However, many jobs contain more than 1 task and some include job rotation. This case/control study investigates methods of modifying an existing tool, the American Conference of Governmental Industrial Hygienists (ACGIH) Hand Activity Level (HAL) Threshold Limit Value (TLV), to assess the upper extremity risk of multi-task jobs. Various methods of combining the task differences and ratios into a job level assessment were explored. Two methods returned significant odds ratios, (p < .05) of 18.0 (95% CI 1.8–172) and 12.0 (95% CI 1.2–120). These results indicate that a modified ACGIH HAL TLV may provide insight into the workrelated risk of multi-task jobs. Further research is needed to optimize this process.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2005, 11, 3; 263-281
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Job Level Risk Assessment Using Task Level Strain Index Scores: A Pilot Study
Autorzy:
Drinkaus, P.
Bloswick, D. S.
Sesek, R.
Mann, C.
Bernard, T.
Powiązania:
https://bibliotekanauki.pl/articles/90342.pdf
Data publikacji:
2005
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
Strain Index
Distal Upper Extremity (DUE)
multi-task risk assessment
ocena ryzyka zawodowego
choroby narządów ruchu
obciążenie fizyczne
kończyna górna
siła mięśni
Opis:
This paper explores 2 methods of modifying the Strain Index (SI) to assess the ergonomic risk of multi-task jobs. Twenty-eight automotive jobs (15 cases and 13 controls) were studied. The first method is based on the maximum task SI score, and the second method is modeled on the NIOSH Composite Lifting Index (CLI) algorithm, named cumulative assessment of risk to the distal upper extremity (CARD). Significant odds ratios of 11 (CI 1.7–69) and 24 (CI 2.4–240) were obtained using the modified maximum task and CARD, respectively. This indicates that modification of the SI may be useful in determining the risk of distal upper extremity injury associated with a multi-task job.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2005, 11, 2; 141-152
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal for an Indexical Method of Evaluating Risk of Hand Tool Operators’ Exposure to Mechanical Vibrations
Autorzy:
Engel, Z.
Kowalski, P.
Zawieska, W. M.
Powiązania:
https://bibliotekanauki.pl/articles/90780.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
hand-arm vibration
tool
feed force
griping force
drgania
narzędzia ręczne
zagrożenia zdrowia
operator maszyn i urządzeń
siła mięśni
siła chwytania
ręka
Opis:
The article presents proposals for an indexical evaluation of exposure of hand tool operators to vibrations. The presented indices have been developed on the basis of the results of laboratory tests. The examinations studied the effect of pressure force and grip force exerted by an operator on a hand tool as well as the amplitudes and frequencies of an exciting signal on vibrations transmitted in the hand-tool handle system.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 2; 183-194
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Muscle torque of healthy individuals and individuals with spastic hemiparesis after passive static streching
Autorzy:
Freitas, S. T. T.
Abreu, E. M. C.
Reis, M. C.
Cunha, B. S.
Prianti, T. S. M.
Lima, F. P.
Lima, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/306898.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mięśnie
siła mięśni
rozciąganie
muscle hypertonia
muscle strength
passive stretching
Opis:
Spasticity is one of the main causes of contracture, muscle weakness and subsequent functional incapacity. The passive static stretching can be included as having the purpose of increasing musculoskeletal flexibility, however, it also can influence the muscle torque. The objective is to verify the immediate effect of passive static stretching in the muscle strength of healthy and those who present spastic hemiparesis. There were assessed 20 subjects, 10 spastic hemiparetic (EG) and 10 healthy individuals (CG), including both sexes, aged between 22 and 78 years. The torque of extensor muscles of the knee was analyzed using isokinetic dynamometer. Results have shown that EG has less muscle torque compared to CG ( p < 0.01). In addition, EG presented a decrease in significance of muscle torque after stretching ( p < 0.05), however, it has not shown significant alteration in muscle torque of CG after performing the program that was prescribed. Immediately after the passive stretch, a significant torque decrease can be seen in hypertonic muscle; it is believed that this reduction may be associated with the physiological overlap between actin and myosin filaments and so preventing the muscle to develop a maximum contraction.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 1; 35-39
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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