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Utilizing Exoskeletons for Intermittent Trunk Flexion Tasks : = Implications on Kinematics, Stability, Muscle Activity and Fatigue.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Utilizing Exoskeletons for Intermittent Trunk Flexion Tasks :/
Reminder of title:	Implications on Kinematics, Stability, Muscle Activity and Fatigue.
Author:	Kuber, Pranav Madhav.
Description:	1 online resource (392 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
Contained By:	Dissertations Abstracts International86-03B.
Subject:	Biomechanics. -
Online resource:	click for full text (PQDT)
ISBN:	9798384075141

Utilizing Exoskeletons for Intermittent Trunk Flexion Tasks : = Implications on Kinematics, Stability, Muscle Activity and Fatigue.
Kuber, Pranav Madhav.

Utilizing Exoskeletons for Intermittent Trunk Flexion Tasks :Implications on Kinematics, Stability, Muscle Activity and Fatigue. - 1 online resource (392 pages)

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

Thesis (Ph.D.)--Rochester Institute of Technology, 2024.

Includes bibliographical references

Exoskeletons (EXOs) are wearable assistive devices that enhance workers' physical capabilities and reduce injury risk due to overexertion. However, current devices may produce mixed outcomes, and even increase demands. Factors responsible for this gap were identified and potential design improvements were proposed to improve their adoption. A subsequent systematic review showed mixed outcomes in real-world scenarios, possibly due to challenges in conducting field evaluations. A new guideline is proposed, which can be beneficial in improving the generalizability of findings in field evaluations.Low-back is injury-prone due to repetitive trunk flexion tasks, where Back-support industrial exoskeletons (BSIEs) can be beneficial. Literature review suggests that mixed effects during field testing may result from insufficient considerations of realistic factors in lab-based studies (asymmetry, task variations, and their cyclic nature leading to fatigue). In this study, twelve participants performed intermittent bending (with sustained bending, bending/retraction, standing and rest), tasks with/without BSIE and with/without 45⁰ left asymmetry till medium-high fatigue. Each intermittent bending task was preceded and followed by 30 x repetitive bending cycles. Simultaneously, we recorded trunk movement, stability, muscle activity in back and legs, and subjective fatigue ratings.Findings showed that BSIE increased endurance by 50% and was favorably rated by participants. BSIE was beneficial to low-back during sustained portions of intermittent bending (20%) but increased leg demands with fatigue (5%). Similarly, the device reduced back activity (9-22%) during bending, but increased activity during retraction (8%-11%). Asymmetry and fatigue reduced BSIE benefits in right-back by ~8% and ~11-15% respectively. During repetitive bending, BSIE led to minimal back benefits (0-1.8%) but substantial leg benefits (10-18%). Asymmetry increased right low-back and leg demands, while fatigue increased low-back activity (8-12%). BSIE notably led to slower trunk movements and improved stability in both tasks showing no effect on fall-risk. Overall outcomes suggest that BSIE can benefit low-back in tasks with higher portions of sustained bending that require less frequent bending, with rest breaks focusing on relieving leg demands. Future studies may integrate sensing technologies for evaluating BSIEs in real-world scenarios and develop fatigue detection methods that can be used to define task cycle parameters and work-rest ratios.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798384075141Subjects--Topical Terms:

565307
Biomechanics.
Subjects--Index Terms:

BendingIndex Terms--Genre/Form:

554714
Electronic books.

Utilizing Exoskeletons for Intermittent Trunk Flexion Tasks : = Implications on Kinematics, Stability, Muscle Activity and Fatigue.
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520 $a Exoskeletons (EXOs) are wearable assistive devices that enhance workers' physical capabilities and reduce injury risk due to overexertion. However, current devices may produce mixed outcomes, and even increase demands. Factors responsible for this gap were identified and potential design improvements were proposed to improve their adoption. A subsequent systematic review showed mixed outcomes in real-world scenarios, possibly due to challenges in conducting field evaluations. A new guideline is proposed, which can be beneficial in improving the generalizability of findings in field evaluations.Low-back is injury-prone due to repetitive trunk flexion tasks, where Back-support industrial exoskeletons (BSIEs) can be beneficial. Literature review suggests that mixed effects during field testing may result from insufficient considerations of realistic factors in lab-based studies (asymmetry, task variations, and their cyclic nature leading to fatigue). In this study, twelve participants performed intermittent bending (with sustained bending, bending/retraction, standing and rest), tasks with/without BSIE and with/without 45⁰ left asymmetry till medium-high fatigue. Each intermittent bending task was preceded and followed by 30 x repetitive bending cycles. Simultaneously, we recorded trunk movement, stability, muscle activity in back and legs, and subjective fatigue ratings.Findings showed that BSIE increased endurance by 50% and was favorably rated by participants. BSIE was beneficial to low-back during sustained portions of intermittent bending (20%) but increased leg demands with fatigue (5%). Similarly, the device reduced back activity (9-22%) during bending, but increased activity during retraction (8%-11%). Asymmetry and fatigue reduced BSIE benefits in right-back by ~8% and ~11-15% respectively. During repetitive bending, BSIE led to minimal back benefits (0-1.8%) but substantial leg benefits (10-18%). Asymmetry increased right low-back and leg demands, while fatigue increased low-back activity (8-12%). BSIE notably led to slower trunk movements and improved stability in both tasks showing no effect on fall-risk. Overall outcomes suggest that BSIE can benefit low-back in tasks with higher portions of sustained bending that require less frequent bending, with rest breaks focusing on relieving leg demands. Future studies may integrate sensing technologies for evaluating BSIEs in real-world scenarios and develop fatigue detection methods that can be used to define task cycle parameters and work-rest ratios.
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