PSYC06 - Lecture 3&4 Midterm Review.docx

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Elizabeth Page- Gould

PSYC06 - Lectures 3 & 4, Chapter 12, Blascovich et al., 2004 – Cardiovascular System Cardiac measures Heart rate (bpm) and heart period (ibi) – The frequency with which your heart beats Measurement – There are two methods of quantifying heart rate: beats per minute (bpm) and interbeat interval (IBI or RR Interval). BPM is the count of heartbeats (R- spikes) within a minute (~70 for men, ~75 for women). IBI is the time between each beat (R-spike) in milliseconds (~860 for men, ~800 for women). So in one you measure the number in a minute, and in the other you measure the time inbetween each beat. Psychological correlates/meaning – An increased HR means stress, motivating tasks and excitement. While a decreased HR means an aversive stimuli. Pre-Ejection Period (PEP) – The time between when the heart ventricles depolarize and when blood is pushed out of the heart. It reflects the strength of heart contraction. Measurement – It needs two physiological measures to extract PEP: ECG tells you when the ventricles depolarize (O) and Impedance tells you when the ventricles eject blood (B). PEP is measured in milliseconds. Psychological correlates/meaning – It is the only pure measure of the sympathetic nervous system activity. It is concomitant (associated) with engagement and approach motivation. Relationship between heart rate and PEP – The lower the heart rate the higher the PEP. The higher the HR the lower the PEP. They are inverses of each other. Cardiac Output (CO) – The amount of blood pumped through the heart. Measurement – There are two ways to measure: Stroke volume (SV) is the amount of blood ejected from the heart on each beat, measured in millilitres (avg. ~70mL/beat), Cardiac Output (CO) is the amount of blood ejected from the heart per minute, measured in litres (avg. ~5 L/minute). Psychological correlates/meaning – It is the key determinant of oxygen and glucose available to the brain and muscles. The higher CO, the better mental and physical performance. Blood pressure (BP) – It is the pressure against the walls of your blood vessels. Three measures of BP – Systolic Blood Pressure (SBP) is the pressure against vessel walls when the heart is ejecting blood. Diasto
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