Part IV - Cardiovascular Responses to Aerobic Exercise (Hormones, Cardiovascular Drift & Summary)
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- Опубліковано 8 вер 2024
- This final part briefly discusses the hormonal response to exercise with a focus on adrenaline. I also define cardiovascular drift and describe why it occurs. An overall summary is also presented recapping the information from all four parts.
Please let me know if you have any questions.
Thank You very much for these videos. It has truly made a world of difference in my understanding of this topic. its very clear and concise. Thank You Dr.Aamer
Thank you very much for this video. 💯💯💯
Wow! What great explanations in videos 1-4. Made CO much easier to understand. Thank you so much.
Thanks arizonagirl. I am really pleased this video series helped in your understanding! All the best with your future studies.
Awesome video! Need more!
More to come! Please do check out my newer video on the same topic: ua-cam.com/video/5mRpgBB1AdM/v-deo.html
THANK YOU SO MUCH. GREAT EXPLANATION!!!
Hi Jessica - thank you for taking the time to leave a nice comment!
Hello Dr. Sandoo, thank you for this wonderful video!
My question is that, based on the karvonen formula; is the formulation of 220 - age 100% definitive for determining an individuals HRmax? Because we know, through scientific evidence, that the maximal HR of an individual who is aerobically trained can be higher than the result of this formula. For example: I am 25, if i am highly aerobically trained; my HRmax can very well be above 195 bpm(220-25).
Thank you!
Hi Federer, thanks for the comment. Good question. The answer is no, it is not definitive, as there will always be individual differences as demonstrated by your HRmax. Generally, it is accurate, or a good guide when setting exercise intensities for aerobic exercise in the general population.
Great videos, easy to understand. One question I have related to cardiovascular drift is that it does not reduce oxygen levels (say for example hot yoga) do we still get vasodilation or increased blood pressure? I ask because I assume there is no gaseous exchange taking place. What are the health benefits of this type of exercise?
Hi there, thanks for the positive comment. You have asked an interesting question. Although, I am not a Yoga practitioner, I would say that the hot environment will cause increased skin blood flow to allow heat to escape from the sweating. However, because the movements in Yoga are not as intense (relative to running), you will not see a considerable drop in stroke volume. One way to check this could be HR monitoring. If your HR increases to a high level, it is likely that brain is preserving cardiac output (and this may or may not be related to a drop in stroke volume). It all depends on the intensity and duration of the Yoga. Remember cardiovascular drift occurs during prolonged (and intense) exercise in a hot environment. If the exercise is not intense, cardiovascular drift will be very unlikely.
The benefits of hot Yoga will include improved flexibility, better neuromuscular co-ordination, development of strength, and developing mind focus and mindfulness. It is also likely burn calories helping to create a negative energy balance and promote weight loss.
I hope the above answers your question. Best of luck in your training!
thx alot
Your welcome Maxime!
At 80 or 90% vo2 max, heart rate is more responsible for cardiac output than SV, right?
how does sympathetic system selectively constrict GI and renal areteries but dilate skeletal muscle arteries while it normally cause mass vasoconstriction?
Good question. The Mass SNS discharge firstly constricts all the vessels which include the GI and renal tissues as well as other non-exercising tissues. The skeletal muscles vasculature are able to dilate due to a build up of metabolic waste products (via increased energy metabolism from exercise). These waste products dilate the blood vessels. In addition, exercise causes pulsatile blood flow through the muscle vasculature and this too can cause vasodilatation.
@@physiologymadeeasy216 Thank you very much.
But apart from local autoregulation(dilation) due to metabolic waste I recently found that SNS has alpha and beta receptors distributed everywhere.During normal sympathetic stimulation alpha receptor activity dominate and causes vasoconstriction in almost all parts of the body(except heart).But during excercise alpha receptors are blocked in excercising muscle, skin...... and beta receptors dominate and the property of which is to cause vasodilation. Do you think this is correct?
@@turshasakif4937 Yes this is correct. Epinpherine (adrenaline) can act on beta receptors to cause selective vasodilatation of tissues active during exercise such as the skeletal muscle. This usually occurs at low/moderate catecholamine level.