University of Jordan

Faculty of engineering and technology

Industrial engineering department

Human Factors lab.

Eng. Fedaa Al Jabari

Experiment # 3

Heart Rate and Physical work Load Measure

Ibrahem Zaidoun El Qasem 0095195

Ali Hisham Abu Hirra 2051365

Osama Namer Shaksheer 0085040

Doa’a Jamal Abu Al Rub 0098097 Buruj Al Tarawneh 0093580 Maram Abdulrahman 0094420

Objectives:

To study a relationship between heart rate and physical work load. To analyze the effect of gender on the resting heart pulse and working heart rate

pulse.

Introduction:

Heart rate has been used as an index of work load ,The degree of physical work depends not only on the energy consumed during the work, but also on the number of muscles involved and on the extent to which they are under static load.

Physical work demand adjustment and adaptation which affect nearly all the organs, tissues, and fluids of body. The most important adjustments are:

Deep and rapid breathing. Increasing heart rate. Blood pressure rise Release more sugar into the blood from the liver to Increase the supply of sugar Increasing in the body temperature and metabolism rate.

So, measuring the heart rate has many advantages over other methods used to indicate the intensity of work load. The advantages of using heart rate lies in the simplicity of measuring it and yet providing fairly accurate results.

Work type Heart rate High level work stress the heart rate increases to a level appropriate

to the effort then remains constant for the duration of the work.

ceases the pulse returns to normal after a few minutes.

At higher level of stress the heart rate on increasing as long as the stress lasts or the operator is forced to stop from exhaustion, where at lower rate it levels off at steady state. Heart rate is measured as follows:

1) By simply feeling the pulses of the radial artery in the wrist 2) Using instruments of a continuous record of HR, the best method is ECG.

Heart rate is effected by:

ambient temperature proportion of static to dynamic effort the number of muscles involved.

Definitions: • Resting pulse: average heart rate before the work begins. • Working pulse: average heart rate during the work. • Work pulse: difference between Resting and Working pulse. • Total recovery pulse (recovery cost): sum of heart beats from the cessation of

the work until the pulse returns to its resting level. • Total work pulse (cardiac cost): sum of heart beats from the start of the work

until resting level is restored.

Equipment:

Treadmill Stop watch Blood pressure monitor

Procedure:

1. Ask the subject to exercise on the treadmill for 10 minute and monitor the working pulse during the exercise, set the speed of the treadmill to (3 Km/hr).

2. Repeat step 2 but for a progressive changing of the treadmill speed. Set the exercise duration to 10 minutes and the treadmill speed to change from (3 Km/hr) to (6 Km/hr).

3. Repeat steps with treadmill inclination of 5 degrees and 10 degrees.

Name

Heart Rate

Resting walking

5° 10° 3km/hr 6km/hr 6km/hr

Ahmad (smoker)

80 120 160 188

Muhammad (Trine)

108 148 180 140

Tala (Normal)

104 132 148 100

Analysis and Conclusions :

1. Heart rate has been used more and more in recent years as an index of work load. Discuss.

There are many measuring techniques to find the energy consumption during a physical work, one of them is heart rate.

The ability to perform physical work depends on gender, age, body size, health and training.

To match a person’s work capacity with the requirement of a job, one needs to know the individual’s energy capacity.

the heart rate and oxygen consumption have linear relationship in the range between light and heavy work.

Since circularity and metabolic processes are interacting closely. Nutrients and oxygen must be brought to the muscles and metabolic by products removed from it for proper task.

2. Analyze the work pulse for each subject

Name Heart rate Resting pulse Working pulse

5° - 3km/hr Work pulse

Ahmad (smoker)

80 120 40

Muhammad (Trine)

108 148 40

Tala (Normal)

104 132 28

a- Smoking effect Nicotine causes veins and arteries to constrict, meaning that the heart has to work harder than usual to pump the blood around system. This sends the blood pressure and heart rate soaring

b- Training and sport effect Like all muscles, the heart becomes stronger as a result of exercise, so it can pump more blood through the body with every beat and continue working at maximum level, if needed, with less strain. The resting heart rate of those who exercise is also slower, because less effort is needed to pump blood.

c- Gender effect on resting pulse

Normal pulse, or heart rate, ranges from 60 to 100 beats per minute for adults with females typically having a faster pulse than men According to an article published by the University of Chicago Medical Center

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6 km/hr, 5 deg.

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male

female

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