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Consumed Endurance

Consumed Endurance

Mid-air interactions are prone to fatigue and lead to a feeling of heaviness in the upper limbs, a condition casually termed as the gorilla-arm effect. Designers have often associated limitations of their mid-air interactions with arm fatigue, but do not possess a quantitative method to assess and therefore mitigate it.

In this project we investigate a novel metric, Consumed Endurance (CE), derived from the biomechanical structure of the upper arm and aimed at characterizing the gorilla-arm effect.

Citation

Hincapié-Ramos, J.D., Guo, X., Moghadasian, P. and Irani. P. 2014. Consumed Endurance: A Metric to Quantify Arm Fatigue of Mid-Air Interactions. In Proc. CHI '14, ACM.

Download

You can download the CE workbench on GitHub:

https://github.com/hcilab-um/ArmFatigueCE

We present a method to capture CE in a non-intrusive manner using an off-the-shelf camera-based skeleton tracking system, and demonstrate that CE correlates strongly with the Borg CR10 scale of perceived exertion. We show how designers can use CE as a complementary metric for evaluating existing and designing novel mid-air interactions, including tasks with repetitive input such as mid-air text-entry. Finally, we propose a series of guidelines for the design of fatigue-efficient mid-air interfaces.

Arm Values 

The following table presents the standard values at the 50th percentile for males and females, as compiled by Freivalds [2].

[1] - Tan, H., Radcliffe, J., Ga, B. N., Tan, H. Z., Eberman, B., Srinivasan, M. A., and Cheng, B. Human factors for the design of force-reflecting haptic interfaces.

[2] - Freivalds, A. Biomechanics of the Upper Limbs: Mechanics, Modeling, and Musculoskeletal Injuries, 1 ed. CRC Press, June 2004.

Project Publications

The Consumed Endurance Workbench: A Tool to Assess Arm Fatigue during Mid-Air Interactions

Hincapié-Ramos, J.D., Guo, X., and Irani, P. 2014. The Consumed Endurance Workbench: A Tool to Assess Arm Fatigue during Mid-Air Interactions. In Proc. DIS ’14 Demos. ACM. To Appear.

Consumed Endurance: A Metric to Quantify Arm Fatigue of Mid-Air Interactions

Hincapié-Ramos, J.D., Guo, X., Moghadasian, P. and Irani, P. 2014. Consumed endurance: a metric to quantify arm fatigue of mid-air interactions. In Proceedings of the 32nd annual ACM conference on Human factors in computing systems (CHI '14). ACM

Collaborators

Jango Guo

Jango Guo

Alumni
Pourang Irani

Pourang Irani

Professor
Canada Research Chair