Do the requirements included in the regulation on health and safety at school effectively prevent children from carrying too heavy schoolbags?

Malinowska-Borowska, Jolanta; Flajszok, Katarzyna

doi:10.13075/mp.5893.00998

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…Similar studies were pursued to assess the risk factor of noise emitted by different chainsaws ranked in the same performance classes as the model Stihl MS 362. For example, in the model Husqvarna 357 XP, the permitted values of noise level were exceeded, too (Malinowska-Borowska et al 2012, Neri et al 2018, Poje et al 2018. Billo et al (2019) conducted a study with the chainsaw model Stihl MS 361 ranked in the same performance class as Stihl MS 362 and found out that average levels of noise emitted by chainsaws during forest cutting activities were 102.05 dB(A) for felling, 99.20 dB(A) for logging and 95.14 dB(A) for delimbing.…”

Section: Noisementioning

confidence: 99%

“…The transmission of vibrations onto chainsaw operators is connected with various vascular, neurological and muscoskeletal disorders (Griffin 2004), especially with vasoneurosis, Raynaud syndrome and carpal tunnel syndrome Černý 2006, Rak 2018). Adverse impacts of hand-arm vibrations have been proven also by neurophysiological studies which suggest the worsening of mechanical receptors and nerve endings in the skin of fingers (Bovenzi 2004, Malinowska-Borowska et al 2012. Vibrations affect internal body organs, too, namely the back, ribs and jaw because if they reach a critical frequency, oscillation of body organs can be considerably harmful to human health (Rónay and Sláma 1989).…”

Section: Introductionmentioning

confidence: 99%

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Rate of chainsaw vibrations in laboratory conditions and level of chainsaw noise at different distances

Staněk,

Nevrkla,

Jankových

et al. 2023

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The study is focused on the rate of vibrations and level of noise in the chainsaw model Stihl MS 362 which belongs in the group of the best-selling professional chainsaws in the world with a highly efficient anti-vibration system. Testing cuts to determine the rate of vibrations were made on the stems of two tree species: sessile oak (Quercus petraea (Matt.) Liebl.) and Norway spruce (Picea abies (L.) H. Karst.). The purpose of noise level measurement was to compare the influence of chainsaw noise on its operator and on the person occurring behind the zone of protection (5 and 10 metres) from the source of noise. Then a distance from the chainsaw was measured where the level of noise reached 80 dB. The measurements were performed according to ČSN EN ISO 22868:2021. At measuring the chainsaw vibrations, the rate of vibrations acting on both operator’s hands (front and rear grip) was examined. Vibrations were measured according to ČSN EN ISO 22867 (2012). It was found out that the rate of vibrations on the rear handle was in both cases of measurements higher than the rate of vibrations on the front handle. At the same time, a higher rate of vibrations was recorded in sessile oak. As to the level of noise, results of measurements indicated that at working with the chainsaw, hearing protectors have to be used at all three measured distances (close proximity, 5 m from the operator, 10 m from the operator) in order to reduce high noise level as the average noise level was higher than permissible in all measurements. The highest possible tolerable level of acoustic noise (80 dB) at which permanent damage of hearing does not happen was measured at a distance of 21 m from the working place of chainsaw operator. Keywords: chainsaw, Stihl MS 362, vibrations, noise, occupational hygiene, forestry

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Section: Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rate of chainsaw vibrations in laboratory conditions and level of chainsaw noise at different distances

Staněk,

Nevrkla,

Jankových

et al. 2023

BALT FOR

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“…Pelvic tilt in the sagittal plane while walking without a load(1), with an additional load worn in a backpack on both shoulders(2), in a bag on the right shoulder (3), or in a bag worn diagonally on the left shoulder(4) …”

mentioning

confidence: 99%

“…Pelvic rotation in the transversal plane while walking without a load(1), with an additional load worn in a backpack on both shoulders(2), in a bag on the right shoulder (3), or in a bag worn diagonally on the left shoulder(4) Changes in gait parameters and pelvic movement during gait… also affect body posture and may be associated with pain. One third of students report that carrying a backpack causes back pain.⁸ A 25% increase in the risk of lower back pain was observed for every 4 kg increase in estimated backpack weight.⁹ Research byChow et al¹⁰ …”

mentioning

confidence: 99%

Changes in gait parameters and pelvic movement during gait under the influence of light loads carried symmetrically or asymmetrically — preliminary research

Wódka,

Łachut,

Jankowicz-Szymańska

2024

Health Prom Phys Act

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Introduction: Walking is one of the basic human activities. Taking care of the correct gait pattern is important for maintaining proper body posture and preventing dysfunctions of the musculoskeletal system. Since walking often involves carrying a load, the study aimed to evaluate changes in gait parameters and pelvic movement during gait under the influence of light loads carried symmetrically or asymmetrically in a bag or backpack. Material and methods: The group of 11 women and 15 men aged between 19 and 25 were examined. The BTS G-Sensor device was used. The basic gait parameters were examined, as well as the symmetry coefficient of pelvic motion and the range of pelvic motion in each of the three planes. The test involving walking 30 meters was repeated four times: while walking without a load, with an additional load worn in a backpack on both shoulders, in a bag on the right shoulder, or in a bag worn diagonally on the left shoulder. Each time the load was equal to 10% of the participantʼs body weight. Results: Walking speed, stride length to body height ratio, gait symmetry coefficient, and left and right foot propulsive speed did not change significantly during walking while carrying a load of 10% of body weight, regardless of the method of carrying a bag or backpack. Conclusions: Although carrying a light bag or backpack does not change the basic gait parameters, even such a small load reduces the symmetry of pelvic movement and the range of pelvic motion in the frontal and transverse planes during walking.

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What’s in it? – schoolbags in the lives of pupils and classrooms

Billmayer,

Jobér

2024

Scandinavian Journal of Educational Research

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Do the requirements included in the regulation on health and safety at school effectively prevent children from carrying too heavy schoolbags?

Cited by 3 publications

References 11 publications

Rate of chainsaw vibrations in laboratory conditions and level of chainsaw noise at different distances

Rate of chainsaw vibrations in laboratory conditions and level of chainsaw noise at different distances

Changes in gait parameters and pelvic movement during gait under the influence of light loads carried symmetrically or asymmetrically — preliminary research

What’s in it? – schoolbags in the lives of pupils and classrooms

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