Vernier Software and Technology
Vernier Software & Technology

Diurnal Blood Pressure Variation

Figure from experiment 9 from Human Physiology with Vernier


Blood pressure is determined by the output of the heart and the resistance to flow in the vascular system. These, in turn, are affected by factors such as the levels of certain hormones (renin, angiotensin II, aldosterone, cortisol, epinephrine, and norepinephrine), physical activity, emotional or physical stress, salt intake, and smoking. Blood pressure usually reaches a high at 6 a.m. and a low between 2 and 4 a.m. Small peaks and valleys occur every one to two hours throughout the day. For this reason, health care providers measure blood pressure at random times on multiple occasions before diagnosing hypertension, or elevated blood pressure.


In this experiment, you will

  • Obtain graphical representation of blood pressure measured at different times of the day.
  • Analyze the variability of blood pressure readings individually and as a class.
  • Correlate your findings with variables that may have influenced your blood pressure.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Human Physiology with Vernier »

Experiment 9 from Human Physiology with Vernier Lab Book

<i>Human Physiology with Vernier</i> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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