Kinesiology 1070A/B Lecture Notes - Lecture 13: Sleep Onset Latency, Sleep Spindle, Delta Wave

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 1070A/B
• Professor: Andrew Rollo

Document Summary

Sleep causes heart rate, respiration rate and body temp to decrease, slower brain activity (alpha waves are slower, appear on electroencephalogram (eeg)) Non-rem sleep characterized by three separate stages: Stage 1: semi conscious state causing reductions in hr, irregularity in respiration, muscle relaxation and hypnic jerks/twitching. Stage 2: decrease in body temp, short bursts of rhythmical activity on eeg (sleep spindles) which are considered the boundary between semi-consciousness and sleep. Stage 3: further loss of consciousness, very slow brain waves (delta waves, 5-3 cps) make up more than 50% of eeg; often stages 3 and 4 are combined, called slow-wave sleep (sws) Important for health and rejuvenation to get enough sws. Rem stands for rapid eye movements, non-rem means rapid eye movements rarely occur at these times. Rem sleep is a light sleep /when we dream; relatively low voltage mixed frequency eeg (makes up about 20-25% of total sleep time.