Isometric Arm Strength and Subjective Rating of Upper Limb Fatigue in Two-Handed Carrying Tasks

Li, Kai Way; Chiu, Wen-Sheng

doi:10.1371/journal.pone.0119550

Cited by 12 publications

(18 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, these results are consistent with the reported exponential decline in strength regarding the shoulder muscle (Ma et al, ) and upper arm muscle (Li & Chiu, ). The good fitting results suggest that the regressed parameter (fatigue rate, k ) is capable of indicating the hand grip fatigability of an individual.…”

Section: Discussionsupporting

confidence: 91%

“…To test the differences in fatigue performance among participants enduring different relative loads, the participants were divided into two groups based on the median of the relative load (high relative load group: 2 males, 28 females, mean = 19.0%, SD = 2.5%; low relative load group: 26 males, 4 females, mean = 11.5%, SD = 1.7%). Furthermore, these results are consistent with the reported exponential decline in strength regarding the shoulder muscle and upper arm muscle (Li & Chiu, 2015). The good fitting results suggest that the regressed parameter (fatigue rate, k) is capable of indicating the hand grip fatigability of an individual.…”

Section: Relation Between Relative Load Level and Fatigability Meassupporting

confidence: 88%

See 1 more Smart Citation

Subject‐specific hand grip fatigability indicator determined using parameter identification technique

Liu

Zhang

et al. 2018

Hum Ftrs & Erg Mfg Svc

View full text Add to dashboard Cite

During hand grip operations, the fatigability of the local muscle determines the antifatigue capacity and influences the risk of injury of the workers. This study proposes a new hand grip subject‐specific fatigability indicator using a parameter identification technique from a physiologically based muscle fatigue model. Experimental measurements were conducted in a laboratorial fatiguing operation with a fixed external load (5 kg) under a static posture. Sixty participants (30 males and 30 females) participated in the experiment. Subject‐specific hand muscle fatigue rates (k) were identified by performing regressions of the muscle strength during time intervals using the muscle fatigue model. The majority (46/60) of the goodness of fit statistics (R2) was over 0.70, which indicates the validity of using the fatigue rate (k) as a hand grip fatigability indicator. Individual differences in the hand grip fatigue rate (k) were substantial, ranging from 0.14 to 2.57 min−1 with a coefficient of variation of 59.0%. The gender effect and body mass index did not exhibit significant influences on the hand grip muscle fatigue rates (k).

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Relation Between Relative Load Level and Fatigability Meassupporting

confidence: 88%

Subject‐specific hand grip fatigability indicator determined using parameter identification technique

Liu

Zhang

et al. 2018

Hum Ftrs & Erg Mfg Svc

View full text Add to dashboard Cite

show abstract

“…Muscular fatigue is characterized by the decrease of muscular strength, or alternatively the force capabilities, after muscular exertion for a period of time (Banks & Aghazadeh, ; Enoka & Duchateau, ; Vøllestad, ). Decreases of muscular strength, especially under static muscular exertion conditions, have been quantified and modeled to identify the developing of muscular fatigue (Li & Chiu, ; Li, Wang, & Yu, ; Ma et al, ; Roman‐Liu, Tokarski, & Kowalewski, ; C. N. Yi, Tang, & Li, ; Zhang, Li, Zhang, Ma, & Chen, ).…”

Section: Introductionmentioning

confidence: 99%

Modeling of maximum endurance time for one‐handed carrying tasks

Peng

2019

Hum Ftrs & Erg Mfg Svc

Self Cite

View full text Add to dashboard Cite

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

show abstract

“…A Borg CR-10 rating scale was employed to record the levels of muscular fatigue (0 = no fatigue at all to 10 = extremely fatigue) in different body segments of the participant after each pulling trial. This scale is easy to administer and has been adopted in the literature [ 15 , 26 – 28 , 32 ] concerning muscular fatigue.…”

Section: Methodsmentioning

confidence: 99%

“…Muscular fatigue can be defined as “reduction in the ability to exert force in response to voluntary effort” [ 14 ]. It can be quantified by assessing the reductions of maximum voluntary contraction (MVC) before and after the forceful exertion [ 15 , 16 ] and the changes of the electromyography (EMG) of muscles upon forceful exertions [ 17 , 18 ]. Muscular fatigue may also be assessed subjectively.…”

Section: Introductionmentioning

confidence: 99%

Pulling strength, muscular fatigue, and prediction of maximum endurance time for simulated pulling tasks

Tang

et al. 2018

PLoS ONE

Self Cite

View full text Add to dashboard Cite

Truck pulling is one of the common manual materials handling tasks which contribute to musculoskeletal disorders. The maximum endurance time (MET) for two-handed truck pulling tasks has been rarely discussed in the literature. The objectives of this study were to explore the development of muscular fatigue when performing two-handed pulling task and to establish models to predict the MET. A simulated pallet truck pulling experiment was conducted. Sixteen healthy adults including eight females and eight males participated. The participants pulled a handle simulating that of a pallet truck using two hands until they could not pull any longer under two postures. The forces applied for females and males were 139.65 N and 170.03 N, respectively. The maximum voluntary contractions (MVC) of the pulling strength both before and after the simulated pull were measured. After each trial, both the MET and subjective ratings of muscular fatigue on body segments were recorded. The results showed that posture significantly affected MVC of pull both before and after the trial. It was found that foot/shank of the front leg had higher subjective ratings of muscular fatigue than the other body segments. The MET equations employing both power and logarithmic functions were developed to predict the MET of the two-handed pulling tasks. Predictive models established in this study may be used to assess the MET for two-handed pulling tasks.

show abstract

Isometric Arm Strength and Subjective Rating of Upper Limb Fatigue in Two-Handed Carrying Tasks

Cited by 12 publications

References 25 publications

Subject‐specific hand grip fatigability indicator determined using parameter identification technique

Subject‐specific hand grip fatigability indicator determined using parameter identification technique

Modeling of maximum endurance time for one‐handed carrying tasks

Pulling strength, muscular fatigue, and prediction of maximum endurance time for simulated pulling tasks

Contact Info

Product

Resources

About