Physiological Measurement

Heart Rate

Heart rate variability (HRV) is one of the oldest and most robust forms of physiological measurement. HRV is a measure derived from the time interval between heart beats. It is typically collected using electrocardiography (ECG), which utilizes noninvasive electrodes to measure the electrical activity associated with heartbeats. HRV has been related to a number of psychosocial variables, including emotional regulation, marital conflict, anxiety, social rejection, and stress. Although HRV is a robust measure, it is susceptible to natural and artificial moderators that can make interpretation challenging. In addition, HRV is highly susceptible to artifacts such as muscle contractions and movement.

Blood Pressure

Blood pressure (BP) is calculated by combining systolic and diastolic pressure scores measured with a manometer. Systolic pressure is measured when the heart is contracting and diastolic when the heart is at rest. Normative BP varies depending on a number of factors such as age, race, sex, and fitness.

Deviation from baseline has been used in studies related to anxiety, optimism/pessimism, among others. As with HRV, BP reflects an adaptive system that is in a constant state of flux. It can be impacted by a variety of conditions, including obesity, physical activity, and overall health, as well as artifacts such as crossed arms or legs. BP is often measured concurrently with HRV.

Skin Conductance

Surface changes resulting from arousal of the sympathetic nervous system are the focus of this physiological phenomenon. Galvanic skin response (GSR), a noninvasive technique that uses electrodes to measure variation in electrodermal activity, is the principal measurement tool. Changes in the amount of perspiration effect conductivity of the skin and can indicate arousal. GSR has been used to evaluate affective responses to film, responses to violent video games and desensitization resulting from violent gaming, and psychosocial stress and impulsivity. Some studies have utilized skin temperature in lieu of GSR as an indirect measure of blood flow. Both GSR and skin temperature can be effected by ambient temperature and other environmental factors.

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