Video-Based Ergonomic Assessment for Spacesuit Training in a Microgravity Analog

Hernandez, Yaritza; Kim, K. Han; Benson, Elizabeth; Jarvis, Sarah; Rajulu, Sudhakar

doi:10.1177/1071181319631149

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…They extracted posture, frequency, and duration of activity and weights handled from the recordings and concluded that it was difficult for observers to estimate weight and temporal aspects with certainty. Hernandez et al ( 19 ) used videos for an ergonomic assessment for spacesuit training. The video recordings of four tasks were analyzed together with a motion tracking device for orientation in space.…”

Section: Contextmentioning

confidence: 99%

Development of a Digital Video-Based Occupational Risk Assessment Method

Beese

Rodriguez

Spilski

et al. 2021

Front. Public Health

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The development and implementation of an observational video-based risk assessment is described. Occupational risk assessment is one of the most important yet also challenging tasks for employers. Most assessment tools to date use questionnaires, expert interviews, and similar tools. Video analysis is a promising tool for risk assessment, but it needs an objective basis. A video of a plastering worker was recorded using a 360° camera. The recording was then analyzed using the developed observational matrix concerning Work Characteristics, Work Activities as well as potential risks. Risk factors present during the video of the work included lifting, fall from ladder, hazardous substances as well as occasionally bad posture. The worker had no or just one risk factor present during most of the time of the video recording, while only 16 s with more than one risk factor present according to the observational matrix. The paper presents a promising practical method to assess occupational risks on a case-by-case basis. It can help with the risk assessment process in companies which is required by law in some industrialized countries. The matrix in combination with video analysis is a first step toward digital observational risk assessment. It can also be the basis of an automated risk assessment process.

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Section: Contextmentioning

confidence: 99%

Development of a Digital Video-Based Occupational Risk Assessment Method

Beese

Rodriguez

Spilski

et al. 2021

Front. Public Health

View full text Add to dashboard Cite

show abstract

“…At the same time, such parameters as the type of task, size, shape and weight of the manual tool play an important role in the impact on the spine and upper limbs. According to Hernandez et al ( 2019 ) astronaut injuries associated with spacesuit wearing have been reported. For example, potential risk for shoulder injuries in space can be overhead tasks.…”

Section: Introductionmentioning

confidence: 99%

An Empirical and Subjective Model of Upper Extremity Fatigue Under Hypogravity

2022

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In the context of extra-terrestrial missions, the effects of hypogravity (0 < G < 1) on the human body can reduce the well-being of the crew, cause musculoskeletal problems and affect their ability to perform tasks, especially during long-term missions. To date, studies of the effects of hypogravity on human movement are limited to experiments on the lower limbs. Here, we extend the knowledge base to the upper limbs, by conducting experiments to evaluate the effect of hypogravity on upper limb physical fatigue and mental workload in participants. Our hypothesis was that hypogravity would both increase participant productivity, by reducing overall physical fatigue expressed in Endurance Time, and reduce mental workload. Task Intensity-Endurance time curves are developed especially in seated positions, while performing static, dynamic, repetitive tasks. This experiment involved 32 healthy participants without chronic problems of the musculoskeletal system aged 33.59 ± 8.16 years. Using the collected data, fatigue models were constructed for tasks of varying Intensity. In addition, all participants completed the NASA – Task Load Index subjective mental workload assessment, which revealed the level of subjective workload when executing different tasks. We found two trends in the empirical fatigue models associated with the difference between the strength capabilities of males and females. The first is a significant positive (p = 0.002) relation between Endurance time and gravity level (⅙ G Moon, ⅓ G Mars, 1G) with negative coefficient for males and females for a static task. And there is marginal relation (p < 0.1) between overall mental workload and gravity level with a positive coefficient for males and females for the same task. The same trend was observed for dynamic and repetitive tasks. We concluded that the Task Intensity-Endurance Time model, adapted to hypogravity in combination with subjective mental assessment, is useful to human fatigue investigation. The combination of these methods used for ergonomic analysis and digital human modeling, could improve worker productivity. Finally, this study may help prepare astronauts for long-term missions on the Moon and Mars and improve our understanding of how we can prevent musculoskeletal disorders caused by hazardous manual handling under such extreme environments.

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Video-Based Ergonomic Assessment for Spacesuit Training in a Microgravity Analog

Cited by 2 publications

References 9 publications

Development of a Digital Video-Based Occupational Risk Assessment Method

Development of a Digital Video-Based Occupational Risk Assessment Method

An Empirical and Subjective Model of Upper Extremity Fatigue Under Hypogravity

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