Upper limb load as a function of repetitive task parameters: part 1--a model of upper limb load

Area of Science:

• Occupational health and safety
• Biomechanics
• Ergonomics

Background:

• Musculoskeletal disorders are a significant concern in occupational health.
• Quantifying upper limb load in repetitive tasks is crucial for prevention.
• Existing methods may not fully capture the complexity of dynamic loading.

Purpose of the Study:

• To develop a theoretical indicator for upper limb musculoskeletal load.
• To establish a dimensionless parameter based on repetitive task characteristics.
• To introduce the Integrated Cycle Load (ICL) as a novel measure.

Main Methods:

• Developed a model of a repetitive task including upper limb biomechanics.
• Incorporated models for basic upper limb forces and task parameters (cycle length, force).
• Calculated the Integrated Cycle Load (ICL) for 12 distinct external load scenarios.

Main Results:

• The Integrated Cycle Load (ICL) parameter was successfully defined.
• ICL quantifies upper limb load within a single cycle of repetitive tasks.
• The study provides a theoretical framework for assessing musculoskeletal load.

Conclusions:

• The Integrated Cycle Load (ICL) offers a new theoretical approach to assess upper limb load.
• This indicator is based on measurable parameters of repetitive tasks.
• Further validation and comparison with physiological measures are presented in subsequent research.