About Contact Help us

Join us ! Publish !

Interaction Design Foundation

Free educational materials - made by the world's technology elite

About sponsorships

References

Gunnar B. J. Andersson

iPad and tablet version

Publication statistics

Pub. period:1987-1995
Pub. count:5
Number of co-authors:9

Co-authors

Number of publications with 3 favourite co-authors:

Steven A. Lavender:3
Yang-Hwei Tsuang:2
Raghu Natarajan:1

Productive colleagues

Gunnar B. J. Andersson's 3 most productive colleagues in number of publications:

Steven A. Lavender:17
Yang-Hwei Tsuang:2
Raghu Natarajan:1

Calendar

May 27

13th Intl. Conf. on New Interfaces for Musical Expression

May 28

Graphics Interface 2013

May 29

Intl. Workshop on Design and Spontaneity in Computer-Supported Collaborative Learning (DS-CSCL 2013)

May 22

“ User error: replace user and press any key to continue. ”

-- Popular computer one-liner

Share this quote on...
Get more quotes via RSS or by joining our Usability Quote of the Day Facebook Page

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

Help us help you!

Spread the word:
Donate
Other ways to help

Gunnar B. J. Andersson

Add description

← Button will not work: You have not enabled Javascript. How do I enable it?

Rename / change spelling

Add publication

← Button will not work: You have not enabled Javascript. How do I enable it?

Publications by Gunnar B. J. Andersson (bibliography)

1995

Edit | Del

Lavender, Steven A., Li, Yichun, Natarajan, Raghu, Andersson, Gunnar B. J. and Nussbaum, Maury (1995): The Effects of Lifting Speed and Load Magnitude on the Torsional and Lateral Bending Moments during Twisting. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. p. 954.

“Epidemiological studies have associated occupations that require twisting of the torso with increased low-back disorders. The objective of this study was to quantify the torsional and lateral bending moments acting on the spine in three lifting modes that varied in the amount of twisting required. Fifteen subjects lifted boxes, weighing 10 and 20 percent of their body weight, at two speeds. Kinetic and kinematic data were obtained with a two force-platform, four camera, opto-electronic motion detection system. These data were run through an inverse dynamic model to quantify the net torsional and lateral bending moments at L5/S1. Results indicated that the asymmetric lifting activities tested created significantly greater lateral bending and torsional moments on the spine than the sagittally symmetric task. The greatest lateral bending and torsional moments were observed as subjects lifted the 20 percent body weight load from a 90 degree asymmetric position positioned 88 cm from the floor. The faster lifting speed significantly reduced the torsional and lateral bending moments during particular phases of the lifts tested. This suggest that during rapid twisting motions the path taken by the box was doser to the body, thereby, minimizing the box's external moment.”

1993

Edit | Del

Lavender, Steven A., Chen, Ing-Ho, Trafimow, Jordan and Andersson, Gunnar B. J. (1993): Trunk Muscle Activations while Resisting Asymmetric Loads in a Laterally Bent Trunk Posture. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 688-692.

“Asymmetric material handling frequently results in lateral bending of the torso. Each of these factors have been linked via epidemiological investigations to the incidence of low back disorders (LBD). Very little literature is available which describes the response of the trunk muscles in situations which would be analogous to handling materials while bent to the side. Such activities are observed frequently in industrial settings, especially during the initial and final portions of a lift. The objective of the current study was to describe the internal response of the trunk muscles as asymmetric loads were applied to the laterally bent torso. Specifically, this investigation quantified the electromyographic activities (EMG) of 8 trunk muscles under conditions where the trunk was isometrically loaded while the trunk was maintained in a 20 degree laterally bent posture. Moments with a magnitudes of 20 and 40 Nm were applied to fifteen subjects. The direction of the external moments was varied in 30 degree increments completely around the subjects. The EMG data indicates that the muscles showed the greatest activity when they were in opposition to the load's sagittal and frontal plane moment. The muscle showing the largest response was the External Oblique. Significant activity was also observed under conditions in which muscles were creating an antagonistic moment in either the sagittal plane, the frontal plane, or in both planes.”

1992

Edit | Del

Lavender, Steven A., Tsuang, Yang-Hwei and Andersson, Gunnar B. J. (1992): Trunk Muscle Activation while Resisting Asymmetrically Applied Loads in an Axially Rotated Posture. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 752-756.

“The present investigation describes the electromyographic (EMG) response of eight trunk muscles during the application of loads to the torso while subjects maintained a twisted posture. The external moments of 20 and 40 Nm were applied to a harness system as each of the 10 subjects twisted 25 degrees. The applied moment direction was varied in 30 degree increments completely around the subjects (0 to 330 degrees). Surface EMG was used to monitor the left and right Latissimus Dorsi, Erector Spinae, External Oblique, and Rectus Abdominus. Multivariate and univariate analyses of variance (MANOVA and ANOVA) procedures showed significant main effects for all muscles and a significant moment magnitude by moment direction interaction effect in 6 of the 8 muscles. The greatest muscle activity was observed in the right Erector Spinae and the left External Oblique muscles. The results are also compared with an earlier study in which a similar loading paradigm was used as subject maintained a neutral upright posture.”

1991

Edit | Del

Lavender, Steve, Andersson, Gunnar B. J., Tsuang, Yang-Hwei and Hafezi, Ali (1991): Trunk Muscle Coactivation: The Effects of Load Asymmetry and Load Magnitude. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 738-742.

“N/R”

1987

Edit | Del

Andersson, Gunnar B. J. (1987): Biomechanical Aspects of Sitting: An Application to VDT Terminals. In Behaviour and Information Technology, 6 (3) pp. 257-269.

“In order to avoid musculoskeletal problems when working at a VDT terminal, biomechanical aspects of sitting and of working in a sedentary position need to be considered. This paper reviews relevant biomechanical knowledge and relates it to field studies of VDT users and their preferred workstation settings. It is concluded that even though good agreement exists between subject comfort rating and preferred postures on the one hand and biomechanical data on the other, an ergonomic work organization is necessary to achieve the best possible work conditions.”

Add publication