[Work capacity, residual capacity and work tolerance times. A proposed measuring method]

Area of Science:

• Exercise Physiology
• Occupational Health
• Biomedical Engineering

Context:

• Assessing physical working capacity is crucial for occupational health and performance evaluation.
• Traditional methods may require specialized equipment or controlled laboratory settings.
• There is a need for simple, field-deployable methods to evaluate work capacity.

Purpose:

• To introduce a straightforward method for assessing physical working capacity using a "6-minute workload" step-test.
• To determine maximal work capacity, critical power, endurance time, and work capacity loss.
• To adapt the method for individuals with pulmonary or blood diseases.

Summary:

• The proposed method involves two 6-minute step-tests at different power outputs, measuring steady-state heart rate and oxygen uptake (VO2).
• Oxygen uptake can be measured directly or estimated using a nomogram, showing good correlation.
• Calculations for maximal oxygen uptake (VO2MAX), critical oxygen uptake (VO2CRIT), and endurance time are based on linear regressions with predicted maximal and critical heart rates.

Impact:

• This method offers a practical approach for assessing physical working capacity in various settings, including factory environments and workplaces.
• It provides a means to evaluate individuals with conditions affecting oxygen transfer, such as ventilation disorders or low hemoglobin.
• The findings support the use of this simple step-test for broader applications in health and performance monitoring.