Psychophysical and physiological study of one-handed and two-handed combined tasks

Yoon, Hoon-Yong; Smith, James L.

doi:10.1016/s0169-8141(98)00087-0

Cited by 14 publications

(6 citation statements)

References 49 publications

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“…Carrying by hand has been found to be more energy demanding than other modes of carrying such as carrying on the back and on the head (Kilbom, Hägg, & Käll, ). One‐handed tasks were found to have more perceived arm exertion than that of two‐handed tasks (Yoon & Smith, ). Past research on one‐handed carrying has been focused on the weight limits that could be handled by a person (Mital, ; Mital & Manivasagan, ; Yoon & Smith, ), the load on the body when performing such tasks (McGill, Marshall, & Andersen, ) and muscular strength decreasing after performing the tasks (Li et al, ).…”

Section: Introductionmentioning

confidence: 99%

Modeling of maximum endurance time for one‐handed carrying tasks

Peng

2019

Hum Ftrs & Erg Mfg Svc

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The objective of this study was to establish models to predict maximum endurance time (MET) for one-handed carrying tasks. A one-handed carrying experiment, under three loads and two walking speeds, was performed. The participant carried a dumbbell on the side using either dominant or nondominant hand. His or her arm was straight-down.The MET values were collected. Both power and exponential functions were adopted in establishing simplified MET models considering the relative force (f MVC ) applied. The simplified models were further expanded to full models where body weight and walking speed were also included. It was found that the power models provided better estimates than the exponential models when the f MVC was lower than approximately 0.17 for both the simplified and full models. Considering the effects of the walking speed, the full models are recommended when the f MVC is 0.3 or lower. K E Y W O R D S carrying strength, manual materials handling, maximum voluntary contraction, muscle fatigue, musculoskeletal disorder Hum. Factors Man. 2019;29:319-326. wileyonlinelibrary.com/journal/hfm

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Section: Introductionmentioning

confidence: 99%

Modeling of maximum endurance time for one‐handed carrying tasks

Peng

2019

Hum Ftrs & Erg Mfg Svc

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“…Figure 4 shows that the MAWH for the use of two hands is larger than that for the use of the dominant hand and the MAWH for the use of the non-dominant hand is the smallest. In general, [36], who reported that the capacity for one-handed tasks is significantly smaller than the capacity for two-handed tasks. In addition, this study finds that the MAWH declines by approximately 7% if the holding mode is changed from the dominant hand to the non-dominant hand.…”

Section: The Effect Of Holding Modementioning

confidence: 97%

“…Although the MAWH for the use of two hands is the largest, the overall RPE value is the smallest (see Table 5). As mentioned by Yoon and Smith [36], unlike the one-handed tasks, during the two-handed tasks, the load is balanced between the two hands, which effectively distributes the load equally to each arm. This finding indicates that the two-handed mode is favorable to female workers, especially for the jobs that require holding work.…”

Section: The Effect Of Holding Modementioning

confidence: 99%

The effect of operating height and holding mode on holding capacity for female subjects

Chung

2013

Journal of Industrial and Production Engineering

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The holding task is a very common manual human activity, but it has not been investigated previously by psychophysicists. Eight females participate in this study. A psychophysical method is used to determine how the operating height (elbow, shoulder, and overhead heights) and the holding mode (non-dominant, dominant, and two hands) affect the maximum acceptable holding weight (MAWH), heart rate (HR), and rating of perceived exertion (RPE), when holding a box against a vertical surface. The operating height and the holding mode have a significant influence on the MAWH. However, the HR is not significantly influenced by the operating height and the holding mode. The overall RPE values are significantly influenced by the holding mode. The most stressed body parts are the arms, wrists, and shoulders. In general, these findings indicate that the holding task should be performed using two hands or ergonomically redesigned as much as possible.

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“…Although many work activities are largely automated, many occupational settings still are using manual material handling (MMH) which can cause significant problems even with more recently developed industrial activities and technologies [ 1 ]. Manual handling is defined as any activity requiring the use of force exerted by a person to lift, lower, push, pull, carry, move, hold or restrain a person or an object [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students

et al. 2018

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Background:Low back pain caused by work, ranked the second after cardiovascular diseases, are among the most common reasons of patients’ referral to the physicians in Iran. This study aimed to determine the changes in back compressive force when measuring maximum acceptable weight of lift in Iranian male students.Methods:This experimental study was conducted in 2015 on 15 young male students were recruited from Tehran University of Medical Science. Each participant performed 18 different lifting tasks involving three lifting frequencies, with three lifting heights, and two box sizes. Each set of experiments was conducted during the 20 min work period using free-style lifting technique. The back compressive force evaluated with hand-calculation back compressive force method. Finally, Pearson correlation test, analysis of variance (ANOVA) and t-test were used for data analysis.Results:The mean of back compressive force (BCF) for the small and large boxes at a frequency of 1lift/min at heights of F - K height, were 1001.02 (±86.74), 1210.57 (±93.77) Ib, respectively. There was a significant difference between mean BCF in terms of frequencies of lifts (P=0.02). The result revealed significant difference between frequencies of 1 lift/min and 6.67 lift/min (P=0.01). There was a significant difference between mean BCF in terms of the sizes of the two boxes (P=0.001). There was a significant relationship between the BCF and maximum acceptable weight of lift in all test conditions (P=0.001).Conclusion:BCF is affected by box size, lifting frequency and weight of load.

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Psychophysical and physiological study of one-handed and two-handed combined tasks

Cited by 14 publications

References 49 publications

Modeling of maximum endurance time for one‐handed carrying tasks

Modeling of maximum endurance time for one‐handed carrying tasks

The effect of operating height and holding mode on holding capacity for female subjects

Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students

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