Journal Entry Week 3
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American Military University *
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314
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Health Science
Date
Feb 20, 2024
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docx
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Uploaded by silvasurfer27
Hello class,
During an acute bout of aerobic exercise both the cardiovascular system and the respiratory system work together to supply oxygen to muscles and vital organs, as a result the systems will respond similarly in several ways. The similarities can be identified by linking several of the terms for both systems to show the relations between blood flow and oxygen/carbon dioxide exchange. First, heart rate and respiratory rate reflect the number of beats and breaths respectively between the two systems. Second, stroke volume is the amount of blood the left ventricle pumps out in a single beat (Shutt, 2014), much like tidal volume is the amount of air that is inhaled and exhaled per breath (PT Direct, 2010). Last, cardiac output
represents the amount of blood pumped by the heart in a minute (Shutt, 2014), similarly ventilation is the amount of air inhaled and exhaled in a minute (PT Direct, 2010). All six of these measurements increase during aerobic exercise to meet the demands of exercise (Integrated Health Sciences, 2020).
However, these two systems differ in that the cardiovascular response to aerobic exercise actually occurs before exercise begins with increases in markers like heart rate, systemic blood pressure and myocardial contractility (Wengate, 1991). The respiratory system
features like respiratory rate and tidal volume begin to climb in response to increased oxygen demands once aerobic exercise has begun (PT Direct, 2010). Also, the two systems differ in that the cardiovascular system is completely involuntary versus having almost total control of our respiratory system. We cannot directly control our heart rate and blood pressure like we can our breathing. However, an individual’s ability to take control of their breathing can allow
them to lower their heart rate and even blood pressure (Pramanik et al., 2009). Dave
References
Integrated Health Sciences. (2020). Aerobic Training
. Integrated Health Sciences. https://ihealthsciences.com/aerobic-training
Pramanik, T., Sharma, H. O., Mishra, S., Mishra, A., Prajapati, R., & Singh, S. (2009). Immediate effect of slow pace bhastrika pranayama on blood pressure and heart rate. Journal of Alternative and Complementary Medicine (New York, N.Y.)
, 15
(3), 293–295. https://doi.org/10.1089/acm.2008.0440
PT Direct. (2010). Respiratory Responses to Exercise
. Ptdirect.com. https://www.ptdirect.com/training-design/anatomy-and-physiology/acute-respiratory-
responses
Shutt. (2014). YouTube
. Www.youtube.com. https://www.youtube.com/embed/d0Qp4ybdNjs?
wmode=opaque&rel=0
Wengate, S. (1991). Acute effects of exercise on the cardiovascular system. Lgapi-
Us.libapps.com
, 5
(4), 27–38. https://lgapi-us.libapps.com/ld.php?
er_attachment_id=937099&site_id=1192
Reply 1: Jonathan McMurry
JD,
Thank you for the compliment, I am glad that I was able to bring up a point of interest for you. I enjoy stimulating the vagus nerve when during yoga and stretching on my active rest days and I perform deep breathing in bed almost every night because it helps me to fall asleep quicker. Do you do any relaxation exercises regularly or when you feel stressed?
Dave
Reply 2: Grant Welsh
Grant,
I enjoyed reading your post this week. I think you did pretty well for not reading all the material. The cardiovascular system and the respiratory system both have a similar limitations. The respiratory system’s tidal volume, or the amount of air that can be inhaled in one breath, and the cardiovascular system’s stroke volume, or amount of blood that can be pumped from the heart in one beat cycle, are similar in that they limit the total outputs of both systems. However, the respiratory rate and heart rate do continue to increase as you mentioned, helping to support the oxygen needs. I hope you had a chance to get all the reading and assignment done. I found the additional resource videos helpful this week as well.
Dave
Reply 3: Tiffany Reiss
Dr. Reiss,
Routine aerobic training serves many benefits to the cardiovascular and respiratory systems; from strengthening the intercostal muscles between the ribs and the diaphragm, to strengthening the heart muscle and improving blood pressure. Specifically, aerobic training 3-5 times a week has been shown to increase the mass of the heart by thickening the walls of the ventricles. The stronger the heart, the more efficient is it at pumping blood. The thicker ventricular walls increase produce a more powerful pump, thereby increasing the stroke volume. The larger stroke volume means that the heart pumps more blood out to the body per beat, meeting oxygen demands with less beats per minute resulting in a lower heart rate (Nystoriak & Bhatnagar, 2018).
Dave
Reference
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Nystoriak, M. A., & Bhatnagar, A. (2018). Cardiovascular Effects and Benefits of Exercise. Frontiers in Cardiovascular Medicine
, 5
(135). https://doi.org/10.3389/fcvm.2018.00135
Reply 4: Zhiheng Zhang
Zhiheng,
Great post, I don’t know about you, but I find the heart to be one of the most interesting organs in the body. I didn’t know too much about the internal structures of the lungs and how gas exchange is performed, so I enjoyed learning a bit about the respiratory system this week as well.
I found the video on how lung volume changes to be very informative, especially the part about how the alveoli expand and contract with the expansion of the ribs via the intercostal muscles. I also didn’t know how many alveoli there actually are in the lungs, I am imagining 500 million cauliflower heads in the lungs from the drawings in the video
(Khan Academy, 2012). Do you have a specific organ or system of the body that intrigues you the most? Dave
Reference
Khan Academy. (2012). How does lung volume change?
Www.youtube.com. https://www.youtube.com/embed/dTsUyXXudvA?wmode=opaque&rel=0