Influence of a passive lower-limb exoskeleton during simulated industrial work tasks on physical load, upper body posture, postural control and discomfort

Luger, Tessy; Seibt, Robert; Cobb, Timothy J.; Rieger, Monika A.; Steinhilber, Benjamin

doi:10.1016/j.apergo.2019.05.018

Cited by 58 publications

(35 citation statements)

References 26 publications

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“…With a reduced mean SS ABS.MIN of about 12 mm (~44% reduction compared to standing without exoskeleton), the exoskeleton clearly lowers that safety margin. With respect to previously published results from a simulated industrial task, no differences between standing without exoskeleton and sitting on the exoskeleton were detected in this postural stability measure (Luger et al, 2019b). The requirements of postural control strategies related to such an industrial task may be low, Figure 5.…”

Section: Risk Of Falling When Reaching For An Object At the Lateral Esupporting

confidence: 49%

“…The study included three experiments of which two are reported in this paper. The third experiment was a simulated manual task with the main focus on quantifying exoskeleton induced changes in physical load, body postures, postural stability, and perceived discomfort (Luger et al, 2019a(Luger et al, , 2019b). In the current study, the two remaining experiments addressing postural stability are reported.…”

Section: Methodsmentioning

confidence: 99%

“…Under each exoskeleton condition, the subjects had to bring their torso in an upright position, with the upper arms vertical and an elbow flexion angle of 105°. Based on this posture, the table was adjusted to the height of the subject's hand (for details, see Luger et al, 2019b). The reaching distance to the object was adjusted to the individual length of the horizontal and extended arm at a 180° transversal shoulder adduction angle ( Figure 2).…”

Section: Methodsmentioning

confidence: 99%

“…Recent studies of back/ trunk and upper extremity exoskeletons mainly address its effects on physical demands and user acceptance (Bosch et al, 2016;Huysamen et al, 2018;Rashedi et al, 2014). The few studies that deal with exoskeletons in an occupational setting for the lower extremity are mainly from our own group and focus on similar aspects including physical demands, body posture, and perceived discomfort (Luger et al, 2019a(Luger et al, , 2019b. Besides these commonly addressed parameters, it is highly relevant to investigate safety-related aspects for a safe implementation and application of exoskeletons.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous paper, we already reported that static standing stability when using the Chairless Chair exoskeleton did not meaningfully decrease during a simulated repetitive industrial task. This task was characterized by an ergonomic posture and with no fast movements of the arms or the torso which could disturb balance (Luger et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

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Postural Control When Using an Industrial Lower Limb Exoskeleton: Impact of Reaching for a Working Tool and External Perturbation

et al. 2020

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Objective To investigate postural control related to a lower limb exoskeleton (Chairless Chair) when (a) reaching for a working tool, and (b) an external perturbation occurs. Background Lower limb exoskeletons aiming to reduce physical load associated with prolonged standing may impair workers’ postural control and increase the risk of falling. Method Forty-five males were reaching for an object (3-kg dumbbell) at the lateral end of their reaching area without the exoskeleton in upright standing (STAND) and with the exoskeleton at a high (EXOHIGH.SEAT) and low sitting position (EXOLOW.SEAT). The task was performed with the object placed in three different angles (120°, 150°, and 180°) in the transversal plane. The minimum absolute static postural stability (SSABS.MIN) as the shortest distance (mm) of the center of pressure to the base of support border was measured (zero indicates risk of falling). Additionally, eight subjects were standing without the exoskeleton or sitting on it (EXOHIGH.SEAT and EXOLOW.SEAT) while being pulled backward. The tilting moment when subjects lost their balance was assessed. Results SSABS.MIN was lower when using the exoskeleton ( p < .05) but still about 17 mm. The location of the object to be reached had no influence. Tilting moments of less than 30 nm were sufficient to let people fall backward when sitting on the exoskeleton (50 nm for STAND). Conclusion Impairments in postural control by the exoskeleton may not be relevant when reaching laterally for objects up to 3 kg. When an external perturbation occurs, the risk of falling may be much higher; irrespective of factors like uneven or slippery flooring. Application The risk of falling using the exoskeleton seems to be low when reaching laterally for an object of up to 3 kg. In situations where, for example, a collision with coworkers is likely, this exoskeleton is not recommended.

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Section: Risk Of Falling When Reaching For An Object At the Lateral Esupporting

confidence: 49%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Postural Control When Using an Industrial Lower Limb Exoskeleton: Impact of Reaching for a Working Tool and External Perturbation

et al. 2020

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Managing Low‐back Disorder Risk in the Workplace

Marras

Karwowski

2021

Handbook of Human Factors and Ergonomics

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Application of microsensors and support vector machines in the assessment of lower limb posture correction in adolescents

Yin-man

Wang²

2022

Concurrency and Computation

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SummaryAutomatic monitoring of physical activity provides reliable data support for the maintenance of people's physical health and provides more scientific data for studying the relationship between physical activity and disease. In this article, a research on the evaluation of adolescent lower limb posture correction based on collaborative filtering and microsensors is carried out. Aiming at the problem that the human body posture monitoring system needs multiple nodes, this article simplifies the existing human body posture monitoring model and establishes a human body model with four degrees of freedom of the lower limbs. On this basis, the micro‐sensor assembly scheme and monitoring node layout scheme for obtaining model description parameters are determined. Methods such as collaborative filtering and support vector machines are used in the process of sensor data processing and correction effect evaluation. Finally, this article uses the constructed human body posture monitoring system to carry out the recognition test of the specific posture of the human body. The experimental results show that the evaluation scheme can effectively monitor and evaluate the effect of lower limb posture correction in adolescents.

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Influence of a passive lower-limb exoskeleton during simulated industrial work tasks on physical load, upper body posture, postural control and discomfort

Cited by 58 publications

References 26 publications

Postural Control When Using an Industrial Lower Limb Exoskeleton: Impact of Reaching for a Working Tool and External Perturbation

Postural Control When Using an Industrial Lower Limb Exoskeleton: Impact of Reaching for a Working Tool and External Perturbation

Managing Low‐back Disorder Risk in the Workplace

Application of microsensors and support vector machines in the assessment of lower limb posture correction in adolescents

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