Effects of Pause Design on the Decline in Pulling Effort and the Evaluation of Perceived Effort in Pulling Tasks

Yi, Cannan; Tang, Fan; Li, Kaiway; Hu, Hong; Zuo, Huali; Zhao, Caijun

doi:10.3390/app112412022

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…In the current study, the participants grabbed the handle and pulled and walked on a treadmill. The only difference between the static pulling task in the literature [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ] and our study was that the participants in our study needed to walk. The participants might need more effort to pull and walk than those in the static pulling tasks.…”

Section: Resultsmentioning

confidence: 87%

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Fatigue and Recovery of Muscles for Pulling Tasks

Zuo

Zhao

et al. 2022

IJERPH

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Manual materials handling (MMH) contributes to musculoskeletal disorders (MSDs) in the workplace. The development and recovery of muscle fatigue are essential in work/rest arrangements for MMH tasks. A pulling experiment, including a muscle fatigue test and a muscle fatigue recovery test, was conducted. In the muscle fatigue test, the participant performed a pulling task on a treadmill with a walking velocity of 1 km/h until they could no longer do so. The load was either 30 or 45 kg. The maximum endurance time (MET) was recorded. The pull strength (PS) of the participant both before and after the pulling task was measured. The subjective ratings of muscle fatigue after the pulling task were recorded. In the muscle fatigue recovery test, the participant took a rest after performing the pulling task. The participants reported their subjective ratings of muscle fatigue on the CR-10 scale after taking a rest for a time period t, where t = 1, 2,…, 6 min. The PS of the participant was then measured again. It was found that the load significantly affected the MET for pulling tasks. The load was insignificant to the decrease of the PS, but was significant to the decrease rate (PS decrease per min) of the PS. The PS decrease rate for the 45 kg condition (30.8 ± 16.5 N/min) was significantly higher (p < 0.05) than that of the 30 kg condition (15.4 ± 5.5 N/min). The recovery time significantly affected the PS and CR-10. Two MET models were established to explore the development of muscle fatigue in pulling tasks. A PS model was constructed to describe the recovery of muscle force. A CR-10 model was proposed to show the subjective ratings of recovery. These models are beneficial for determining the work/rest allowance for pulling tasks.

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Section: Resultsmentioning

confidence: 87%

“…Pulling tasks involving both static [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ] and dynamic [ 13 , 23 , 24 , 25 , 26 , 27 ] postures have been reported. The difference between those two approaches was whether the participants needed to walk when they were pulling.…”

Section: Introductionmentioning

confidence: 99%

Fatigue and Recovery of Muscles for Pulling Tasks

Zuo

Zhao

et al. 2022

IJERPH

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Relationship between one-handed push force and subjective rating of force exertion

Yi,

Yang,

Zhou

et al. 2024

WOR

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BACKGROUND: Pushing is a typical workplace activity that may result in musculoskeletal disorders (MSDs). A convenient method of assessing the risk of MSDs is to determine the association between the force applied and the subjective rating of force exertion. OBJECTIVES: This study aimed to determine the relationship between the subjective rating of force exertion and the force applied to both a fixed and a movable handle. It also aimed to confirm that the participants could apply a higher one-handed push force at shoulder height than at elbow height. METHODS: A one-handed pushing experiment was conducted. In the push-to-scale session, the participants pushed a handle fixed on a rig on four levels on the CR-10 scale. The push force was measured. In the force-rating session, the participants rated their force exertions when pushing a movable handle with metal blocks suspended on the two sides. The subjective ratings on the CR-10 were recorded. RESULTS: The one-handed push force at shoulder height was significantly higher than that at elbow height. More effort was needed to push on a movable handle than a fixed one. Two regression models were established to describe the relationship between the push force and the subjective ratings of pushing for each of the fixed and movable handles, respectively. The correlation coefficient results showed that these models are adequate to describe the relationship between the one-handed push force and the ratings of the CR-10 scale. CONCLUSION: Participants applied a higher one-handed push force at shoulder height than at elbow height was confirmed. Participants needed more efforts to push the movable handle under the same CR-10 level than the fixed handle. The predictive models developed in this study may be used to estimate the push force for one-handed pushing tasks when assessing the risk of MSDs.

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Effects of Pause Design on the Decline in Pulling Effort and the Evaluation of Perceived Effort in Pulling Tasks

Cited by 2 publications

References 29 publications

Fatigue and Recovery of Muscles for Pulling Tasks

Fatigue and Recovery of Muscles for Pulling Tasks

Relationship between one-handed push force and subjective rating of force exertion

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