Symmetric and Asymmetric Two-Handed Pull-Push Strength of Young Adults

Forty normal young adults volunteered for an experiment in which they were required to perform two-handed maximal pull-push in isometric and isokinetic modes (50 cm/s linear velocity of the handle) at 50-, 100-, and 150-cm heights of handle in sagittal, 30-deg lateral, and 60-deg lateral planes. Subjects were stabilized on a circular platform that rotated on its axis and allowed fixation in any position to achieve asymmetric settings. The pull-push strengths were applied to a 53-cm wide handle and were measured through the load cell assembly of the Static Dynamic Strength Tester. The peak and average strengths were compared statistically, and an ANOVA and multiple regression were performed. The main effects of gender, activity (pull or push), mode (isometric or isokinetic), plane (sagittal, 30 deg lateral, or 60 deg lateral), and height (low, medium, or high) of activity for both peak and average strengths were highly significant (p < 0.01). All subjects were strongest in pulling activity in the isometric mode in the sagittal plane at medium height. Males were significantly stronger than females for most activities. However, with increased postural asymmetry, the difference between genders declined.

[1]  Sheik N. Imrhan,et al.  The arm configuration at the point of peak dynamic pull strength , 1990 .

[2]  C. J. McGrath,et al.  Effect of exchange rate return on volatility spill-over across trading regions , 2012 .

[3]  S Kumar,et al.  Static and dynamic lifting strength at different reach distances in symmetrical and asymmetrical planes. , 1992, Ergonomics.

[4]  D B Chaffin,et al.  Validation of a biodynamic model of pushing and pulling. , 1991, Journal of biomechanics.

[5]  A. Mital,et al.  Effects of sitting and standing, reach distance, and arm orientation on isokinetic pull strengths in the horizontal plane , 1990 .

[6]  S. Beaugrand,et al.  The dynamics of pushing loads onto shelves of different heights , 1992 .

[7]  D. Grieve,et al.  Human strength capabilities during one-handed maximum voluntary exertions in the fore and aft plane. , 1991, Ergonomics.

[8]  D A Stubbs,et al.  Safe levels of manual forces for young males (3). , 1978, Applied ergonomics.

[9]  K. H. Eberhard Kroemer.  Horizontal push and pull forces: exertable when standing in working positions on various surfaces. , 1974 .

[10]  M. M. Ayoub,et al.  Effects of Operator Stance on Pushing and Pulling Tasks , 1974 .

[11]  Shrawan Kumar,et al.  Effect of body posture on isometric torque-producing capability of the back , 1991 .

[12]  D. Chaffin,et al.  Isometric and isokinetic back and arm lifting strengths: device and measurement. , 1988, Journal of biomechanics.

[13]  B J Daams.  Static force exertion in postures with different degrees of freedom. , 1993, Ergonomics.

[14]  S Kumar,et al.  Physiological responses to weight lifting in different planes. , 1980, Ergonomics.

[15]  S. Kumar.  Arm lift strength in work space. , 1991, Applied ergonomics.

[16]  D. W. Grieve,et al.  The influence of some handle designs and handle height on the strength of the horizontal pulling action , 1992 .

[17]  Sheik N. Imrhan,et al.  The effects of arm elevation, direction of pull and speed of pull on isokinetic pull strength , 1992 .

[18]  Don B. Chaffin,et al.  Volitional Postures during Maximal Push/Pull Exertions in the Sagittal Plane , 1981, Human factors.

[19]  Arun Garg,et al.  One-handed dynamic pulling strength with special reference to speed, handle height and angles of pulling , 1990 .

[20]  D A Stubbs,et al.  Safe levels of manual forces for young males (1). , 1977, Applied ergonomics.