Week 6 – Exercise Physiology Gen Bio II

Homeostasis Maintenance of a relatively steady physiological state Maintenance of a relatively steady physiological state Body systems interact to react to different conditions while maintaining this steady state Body systems interact to react to different conditions while maintaining this steady state Conservation of Energy

Blood Pressure What is blood pressure (BP)? What is blood pressure (BP)? BP is hydrostatic pressure against the walls of the vessels BP is hydrostatic pressure against the walls of the vessels BP = CO x TPR BP = CO x TPR CO = cardiac outputCO = cardiac output TPR = total peripheral resistanceTPR = total peripheral resistance What influences cardiac output (CO)? What influences cardiac output (CO)? Heart rate (HR) Heart rate (HR) Stroke volume (SV) is amount of blood pumped with each beat Stroke volume (SV) is amount of blood pumped with each beat

Measuring blood pressure BP reading = systolic / diastolic BP reading = systolic / diastolic Systolic pressure = when ventricles contract Systolic pressure = when ventricles contract Diastolic pressure = natural pressure in enclosed system Diastolic pressure = natural pressure in enclosed system

Todays Problem What happens to bp when you exercise? What happens to bp when you exercise? Increased cardiac output (CO) Increased cardiac output (CO) Capillary beds open up (expand) leading to ___________ total peripheral resistance (TPR) Capillary beds open up (expand) leading to ___________ total peripheral resistance (TPR) Lab tips Lab tips Technique matters! You may want to go outside or to the corner of the room so you can hear the systolic and diastolic pressure better Technique matters! You may want to go outside or to the corner of the room so you can hear the systolic and diastolic pressure better Calculations Calculations Decreased

Important Equations to Make Mean Arterial Pressure (AP m ) Mean Arterial Pressure (AP m ) 2/3 diastolic + 1/3 systolic 2/3 diastolic + 1/3 systolic SV rest = 1 ml/beat x mass (kg) = YOUR WEIGHT IN KG = (weight in lb/2.2) SV rest = 1 ml/beat x mass (kg) = YOUR WEIGHT IN KG = (weight in lb/2.2) SV exer = ([% change in HR] x SV rest ) + SV rest SV exer = ([% change in HR] x SV rest ) + SV rest % change in HR = ([HR exer – HR rest ] / HR rest ) x 100 % change in HR = ([HR exer – HR rest ] / HR rest ) x 100 AP m = (HR x SV) x TPR TPR =Ap m/ (HR x SV) AP m = (HR x SV) x TPR TPR =Ap m/ (HR x SV)

Plant Diversity Week 1 Do this if waiting for data from the rest of class or once you finish Exercise Phys lab Do this if waiting for data from the rest of class or once you finish Exercise Phys lab Page 132=122, Page 132=122, ONLY do procedure 2 ONLY do procedure 2 Record observations in the drawing andNotes section of the lab report (page 138) of spores examined on the dissecting scope Record observations in the drawing andNotes section of the lab report (page 138) of spores examined on the dissecting scope