Physical workload, perceived exertion, and output of cut wood as related to age in motor-manual cutting

Hagen, Kåre Birger; Vik, Torstein; Myhr, N E; Opsahl, P A; Harms‐Ringdahl, Karin

doi:10.1080/00140139308967906

Cited by 35 publications

(20 citation statements)

References 10 publications

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“…12,37 The high intensity can be compared with that in very heavy work, 15 such as wood-cutting. 38 Therefore long and brisk walks should not be regarded as low-intensity and fat-burning training for obese women in general. Since the average work load during a day causes fatigue if it exceeds 30±40% Á O 2 max, 15 it seems natural that walking for exercise may be too demanding and fatiguing for many obese women.…”

Section: Discussionmentioning

confidence: 99%

Is walking for exercise too exhausting for obese women?

1997

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OBJECTIVES: As exhaustion and pain during walking seem to be common problems among obese women, we decided to analyse the relative oxygen cost (%V Á O 2 max) in obese women during level walking.SUBJECTS: Fifty-seven obese female outpatients, 44.1 AE 10.7 y, BMI 37.1 AE 3.4 kg Á m 72 . METHODS: Walking tests at a self-selected, comfortable speed were performed indoors. Speed was measured with a speedometer, oxygen consumption (V Á O 2 ) with the argon-dilution method and oxygen cost was estimated. Heart rate was measured; perceived exertion and pain were assessed with Borg's Category Ratio scale, CR10. Maximum oxygen uptake (V Á O 2 max/kg) was predicted from a submaximum bicycle ergometry test.RESULTS: The women walked more slowly, 70.9 AE 5.6 m Á min 71 (P`0.0001), and had higher V Á O 2 , 1.2 AE 0.2 l Á min 71 (P`0.001), than normals. A majority experienced exertion and some experienced pain. Their V Á O 2 max/kg, 21.2 AE 5.0 ml Á kg 71 Á min 71 , was less than for normals (P`0.0001). The mean % V Á O 2 max during walking was 56%, which was higher than in normal subjects 36% (P`0.0001). Signi®cant correlations between %V Á O 2 max and V Á O 2 max/kg (P`0.0001), heart rate during walking (P 0.0009) and age (P 0.0081), respectively, were found.CONCLUSION: Very low V Á O 2 max/kg in obese women, rather than severe obesity per se, seems the most important factor to cause high %V Á O 2 max during walking. This might explain why many obese women perceive the exertion to be excessive and cannot follow the advice of their clinicians to exercise through long and brisk walks.

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Section: Discussionmentioning

confidence: 99%

Is walking for exercise too exhausting for obese women?

1997

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“…Motor-manual timber harvesting is considered to be one of the hardest and most dangerous types of work [1,2,3,4]. Average values of heart rate (HR) during chainsaw operating oscillate between 110-138 bpm [5,6,7,8,9]. Logging using a chainsaw also creates a large load on the musculoskeletal system as a result of adopting awkward (forced) postures during operations.…”

Section: Introductionmentioning

confidence: 99%

Does body posture during tree felling influence the physiological load of a chainsaw operator?

Grzywiński¹,

Jelonek²,

Tomczak³

et al. 2017

Ann Agric Environ Med.

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Does body posture during tree felling influence the physiological load of a chainsaw operator? Ann Agric Environ Med. 2017; 24(3): 401-405. doi: 10.5604/12321966.1235177 Abstract Introduction and Objectives. Holding determined body postures during work is connected with muscles activity. The more forced the posture, the larger the number of muscles taking an active part in holding and stabilizing the work posture. During logging, the greatest share of awkward (forced) working postures occurs in tree felling by chainsaw. Materials and Method. A group of 10 experienced fellers aged 47.5±7.3 (37 -59-years-old) was studied. Heart rate (HR) was measured during simulation of felling activity in 4 working postures: back bent forward with straight legs (stoop), back bent forward with bent legs (flexed-stoop), squat and kneeling on one knee (half-kneel). Results. The lowest value of HR was noticed for squatting -114.1 bpm, then for kneeling on one knee -116.3 bpm. HR during felling in a standing posture with straight legs amounted to 121.5 bpm and for standing with bent legs 125.3 bpm. For all studied postures the differences in average HR values were statistically significant at p<0.01. Conclusions. A working posture during tree felling by chainsaw has influence on the level of physiological workload of an operator. Standing bent forward body postures cause higher heart response than squatting and half-kneeling.

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“…O trabalho neste setor é considerado um dos mais extenuantes e perigosos no mundo em comparação a outras atividades econômicas (HARSTELA, 1990;HAGEN et al, 1993;LILLEY et al, 2002). Lima & Leite (2014) destaca que nos países industrializados, a mecanização já chegou a um nível tão alto que o trabalho mais pesado é feito em rodízio por diversos trabalhadores, porém no Brasil isso ainda não é uma realidade, atividade em que ainda há baixa mecanização e grande demanda por mão de obra nas operações florestais (SANT 'ANNA & MALINOVSKI, 2002;LIMA & LEITE, 2014).…”

Section: Introductionunclassified

“…Emmert (2014) destaca que em exploração seletiva de madeira em florestas tropicais, o trabalho exige grande contingente e alta carga física, em uma floresta com denso sub-bosque e sob condições térmicas ambientais desfavoráveis ao trabalho. Em razão destas condições específicas, um bom condicionamento físico e hábitos saudáveis são essenciais para um trabalhador ser produtivo nesta atividade (HARSTELA, 1990;HAGEN et al, 1993;SANT'ANNA & MALINOVSKI, 2002), o que justifica a realização deste trabalho.…”

Section: Introductionunclassified

Frequência Cardíaca Para Estimativas Da Carga Física De Trabalho Na Exploração Florestal

Nascimento

Emmert

Higuchi

2018

BIOFIX

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RESUMOO trabalho em exploração florestal exige grande contingente e carga física sob condições ambientais desfavoráveis. Portanto, um bom condicionamento e hábitos saudáveis são essenciais para o desempenho. O estudo pretendeu a coleta de frequência cardíaca para estimar a carga física do trabalho em exploração florestal. A pesquisa foi conduzida no município de Itapiranga, Amazonas, Brasil. Foram avaliadas as operações de pré-arraste, arraste e pátio, exceto o corte. Foi coletada frequência cardíaca da ocupação mais desgastante em cada operação, e estimadas as cargas físicas por dois métodos: anexo C da ISO 8996 e o método CCV. A variável peso demonstrou forte correlação positiva com a frequência cardíaca. A carga física variou em até 167 kcal/h para a mesma ocupação. A ocupação puxador de cabo (pré-arraste) foi a mais desgastante, sendo considerada pesada e estimou-se pausas de até 15 min./h. A frequência cardíaca demonstrou ser indicadora do condicionamento físico, um aspecto importante, pois interfere no desempenho do trabalhador. PALAVRAS-CHAVE: Amazônia, Gasto metabólico, Manejo florestal. ABSTRACTThe work in forest logging requires large contingent and physical load under unfavorable environmental thermal conditions. Therefore, physical shape and healthy habits are essential for performance. The study aimed at the collection of heart rate to estimate the physical workload in logging. The study was conducted in the municipality of Itapiranga, Amazonas, Brazil. The operations were divided on: cutting, pre-drag, drag and patio; with the exception of cutting all were evaluated. Heart rate was collected from the most exhausting occupation in each operation, and with this, the physical loads were estimated by two methods: Annex C of ISO 8996 and the CCV method. The weight variable showed a positive correlation with the heart rate. The physical load varied up to 167 kcal/h in the same occupation. The cable pull occupation (pre-drag) was the most exhausting and considered heavy, and pauses of up to 15 min/h were calculated. Heart rate estimation resulted in a physical conditioning indicator that interferes with work performance. KEY-WORDS: Amazon, Forest management, Metabolic rate.

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Physical workload, perceived exertion, and output of cut wood as related to age in motor-manual cutting

Cited by 35 publications

References 10 publications

Is walking for exercise too exhausting for obese women?

Is walking for exercise too exhausting for obese women?

Does body posture during tree felling influence the physiological load of a chainsaw operator?

Frequência Cardíaca Para Estimativas Da Carga Física De Trabalho Na Exploração Florestal

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