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Bernard J. Martin

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Publications by Bernard J. Martin (bibliography)

2009

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Yu, Shin-Yuan and Martin, Bernard J. (2009): Movement Control Phases of Upper Body Coordination in Visually Guided Reach Movements. In: Proceedings of the Human Factors and Ergonomics Society 53rd Annual Meeting 2009. pp. 834-838.

“Coordination of human movement includes temporal and spatial aspects. Under the assumption that the implicit movement sequence of body segments may be associated with visual feedback information, the activation timing, time to peak velocity of the hand and sequencing of joint movements were investigated in this study. The results show that variations in movement time with target azimuth and distance fit a quadratic regression model. In addition, the time to peak velocity reveals a movement scaling property in the context of self-imposed movement speed. Finally, the sequencing of joint movement also varies with target azimuth and distance. These motor behavior properties and movement characteristics can be used to model human reach movement in a dynamic manner and to estimate task durations.”

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Kim, Heon-Jeong and Martin, Bernard J. (2009): Effects of Posture and Movement on Vibration Transmissibility Affecting Human Reach Performance under Vehicle Vibration. In: Proceedings of the Human Factors and Ergonomics Society 53rd Annual Meeting 2009. pp. 1714-1718.

“Vibration transmissibility to the human body is a function of both vehicle vibration characteristics and postures associated with the performance of movements. The majority of earlier studies investigating upper body vibration transmissibility considered only a static posture excluding dynamic limb movements (Amirouche, 1987; Wei and Griffin, 1998; Rosen and Arcan, 2003; Yoshimura et al, 2005; Liang and Chiang, 2006). A few recent studies reported the effect of vehicle vibration on arm reaching movements through the description of fingertip deviation from a desired trajectory (Rider and Chaffin, 2003, 2004). The present work investigates the variation of vibration transmissibility to upper extremities as a function of dynamic posture changes along the intended reach trajectory. Dynamic reach movements in the direction of targets distributed in the right hemisphere of a vehicle operator are analyzed as a function of vibration characteristics and movement directions. Thirteen subject performed right hand reach movements in various directions to final/end target location as well as intermediate target locations selected along the trajectory of movement performed to the end target. The established database of upper body segments transmissibility is used to develop an active biodynamic human model.”

1992

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Fletcher, Lisa, Park, Hee-Seok and Martin, Bernard J. (1992): Effects of Hand Vibration on Postural Stability. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 765-769.

“The present work was aimed at defining the contribution of vibration-induced perturbation of hand proprioceptive/exteroceptive feedback on standing equilibrium. A vibrating handle, free in space or fixed to a stationary support, was held in the dominant hand while maintaining an erect posture on a force platform, eyes closed. Four arm positions were used. The results show that body sways increase significantly during hand vibration exposure when the handle is fixed. Significant shifts of the center of pressure COP are elicited in every situations. Furthermore, the shifts of the COP are clearly oriented in the direction of the handle when this latter is fixed. It is suggested that the proprioceptive information issued from the hand contributes to the elaboration of a spatial reference and to the control of posture as a function of the environmental context. These results indicate that hand vibration exposure can be considered as a risk factor which may contribute to fall accidents.”

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