The Labor Intensity Index is an indicator used to measure the physical and mental load of workers at work. It can help employers understand the work situation of employees, arrange work tasks reasonably, improve production efficiency, and also help protect the rights and interests of employees and prevent the occurrence of occupational diseases. There are many ways to calculate the labor intensity index, and here is a commonly used method - the energy metabolic rate method.
The energy metabolism rate method calculates the labor intensity index based on the energy consumed by the worker in the process of work. Energy metabolic rate refers to the amount of energy consumed by the body per unit of time, usually expressed in kilocalorie-hours (kcal h). Depending on the magnitude of the energy metabolism rate, labor can be divided into different intensity classes.
The steps to calculate the labor intensity index are as follows:
1.Determine the basic metabolic rate of a worker:Basic metabolic rate (BMR) is the minimum amount of energy required by the body to sustain vital activities in a resting state, and is usually expressed as basal metabolic rate (BMR). The formula for calculating the basal metabolic rate is: BMR = Male: (13.)7 kg weight) + (50 height cm)-(6..)8 age) + 66;Female: (9.)6 kg weight) + (18 height cm)-(4..)7 age) + 655. Among them, the unit of weight is kilograms, the unit of height is centimeters, and the unit of age is years.
2.Determine the worker's work metabolic rate:Work metabolic rate refers to the amount of energy a worker expends during work, usually expressed as total energy expenditure (TEE). Total energy expenditure can be calculated by measuring physiological indicators such as heart rate and respiratory rate at work, combined with basic metabolic rate. It is calculated as: TEE = BMR activity coefficient. The activity coefficient is a coefficient related to the work intensity of the worker, which can be determined according to the actual situation of different industries and types of work. In general, the range of activity coefficients is 10-1.9 between.
3.Determine the level of labor intensity:Depending on the magnitude of the energy metabolism rate, labor can be divided into different intensity classes. In general, the energy metabolism rate is in the 10-1.Labor between 2 kcal min is considered light labor, such as office work, teachers, etc.;The energy metabolic rate is at 12-1.Labor between 5 kcal min is considered moderate labor, such as mechanical operation, electrician, etc.;The energy metabolic rate is at 15-1.Labor between 9 kcal min is classified as heavy labor, such as handling, construction, etc.;The energy metabolic rate is at 1Labor of more than 9 kcal min is considered extremely heavy labor, such as high-intensity physical training, heavy physical labor, etc.
4.Calculation of the Labor Intensity Index:The labor intensity index is the ratio of the actual energy consumed by the worker to the standard energy consumption. Standard energy consumption refers to the average amount of energy consumed by a worker to complete a certain task in a certain period of time. The formula is: Labor intensity index = TEE standard energy consumption. By comparing the labor intensity index with the thresholds of different intensity levels, it is possible to determine which level of labor intensity the worker bears.
It should be noted that a variety of factors need to be considered when calculating the labor intensity index, such as the age, gender, weight, height, and years of service of the worker. In addition, due to the large differences in labor intensity of different industries and types of work, the activity coefficient needs to be adjusted according to the actual situation in practical applications.
Calculating the labor intensity index by the energy metabolic rate method can provide employers and workers with important information about labor intensity, which is helpful to reasonably arrange work tasks, improve production efficiency, and protect the rights and interests of employees. At the same time, it will also help the first department to formulate relevant policies and strengthen the protection of workers.