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Related Experiment Video

Updated: Jan 30, 2026

Kinematic Analysis Using 3D Motion Capture of Drinking Task in People With and Without Upper-extremity Impairments

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Upper Extremity Muscular Strength in Push-Pull Tasks: Model Approach Towards Task Design.

Joydeep Majumder¹, Sanjay M Kotadiya¹, Lokesh Kumar Sharma¹

¹Division of Physiology and Ergonomics, ICMR-National Institute of Occupational Health, Ahmedabad, Gujarat, India.

Indian Journal of Occupational and Environmental Medicine

|January 17, 2019

Summary

Workplace pushing and pulling strength was assessed in men aged 18-60. Older workers showed a steeper strength decline, highlighting the need for ergonomic tool design and work schedule adjustments.

Keywords:

Anthropometry endurance engineering guidelines isometric strength model forecasting strength sustainability task design time-series analysis

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Area of Science:

Ergonomics and Occupational Health
Biomechanics
Industrial Engineering

Background:

Repetitive forceful exertions during prolonged work tasks increase musculoskeletal disorder risk.
Understanding upper extremity strength is crucial for preventing workplace injuries.

Purpose of the Study:

To investigate upper extremity strength during push-pull hand tool operations.
To forecast worker strength limitations during prolonged or frequent tasks.

Main Methods:

Cross-sectional study of 100 male workers (18-39 and 40-60 years) in Ahmedabad, India.
Isometric upper extremity strength testing (60s) during push-pull tasks.
Holt-Winters time-series model for strength forecasting (120s).

Main Results:

Pull strength exceeded push strength; older workers (Group 2) showed slightly higher initial strength.
Seated exertions yielded greater strength than standing.
Strength forecasting indicated steady values for younger workers (Group 1) but a steep decline for older workers (Group 2).

Conclusions:

Generated strength data can inform work schedule optimization.
The strength forecasting model can guide the development of ergonomic hand tools and workplace engineering guidelines.