Case Study Essay Question: Aerobic Capacity
During exercise, the muscles need to maintain a consistent, regulated flow of blood.
Autoregulation refers to the local factors that regulate this blood flow to the muscles.
Autoregulation controls blood flow intrinsically through a process of adding to the number of
local metabolites (Powers et al., 2020). Some examples of local metabolites include the
following: nitric oxide, prostaglandins, ATP, adenosine, and endothelium-derived
hyperpolarization factors (Powers et al., 2020). As a result, the factors ultimately promote
vasodilation, which describes the process of dilating the blood vessels and leads to increased
blood flow to the muscles that are being used (Powers et al., 2020). Through autoregulation, the
body is able to maintain a fairly normal blood flow.
Autoregulation consists of three different aspects. These aspects include the following:
metabolic regulation, myogenic regulation, and neurogenic regulation. The first aspect is
metabolic regulation. Metabolic regulation ensures that the autoregulation of the blood flow to
the muscles matches the metabolic needs (Powers et al., 2020). When the number of local
metabolic factors increases due to exercise, this results in vasodilation being increased within the
arterioles and small arteries and creates more blood flow to the muscles that are contracting,
which then matches the metabolic need (Powers et al., 2020).
The second aspect of autoregulation is the myogenic theory. The myogenic theory refers
to the vascular smooth muscle that maintains consistency of the vascular tone in response to
changes in pressure (Powers et al., 2020). This form of regulation is often found in the arterioles
but sometimes in the arteries, veins, etc. The final aspect of autoregulation is the neurogenic
theory. This theory refers to the brain receiving enough blood flow to match the metabolic need
(Peterson et al., 2011). The brain also is able to differ the blood flow based on the changing
needs of the metabolic activity (Peterson et al., 2011).
If a person engages in regular cardiovascular training for several months consecutively,
the individual will notice a physiological improvement in his/her aerobic capacity.
Cardiovascular training consists of engaging in exercise types that utilize the muscle groups in a
rhythmic and repetitive way and that elevate a person’s heart rate and elevates the oxygen and
blood flow throughout the entire body. Some examples of cardiovascular training include the
following: HIIT, cycling, running, swimming, hiking, walking, rowing, etc.
If an individual actively incorporates this type of training into his/her workout regime, the
individual will notice a physiological improvement in his/her aerobic capacity. Aerobic capacity
can be explained in the following way: “a large number of mitochondria provides a greater
capacity to produce ATP aerobically” (Powers et al., 2020). In order to perform cardiovascular
exercises, the body requires an increase in blood flow as well as oxygen. Once a person has been
engaging in cardiovascular training for several months, the heart is capable of holding an
increased number of blood cells (Powers et al., 2020). As a result, the heart is also able to
transport oxygen more efficiently over time, which overall will lead to an increase in endurance
(Powers et al., 2020). This type of training leads to a stronger heart that is able to maintain a
normal blood flow for longer periods of time and will match the metabolic needs. The heart is
ultimately able to pump more blood and push oxygen at a better rate. A person will begin to
notice that this type of training gets gradually easier as the body adjusts. After several months,
the body will be able to withstand longer and more demanding cardiovascular training periods. If
a person is looking to physiologically improve their aerobic capacity, engaging in cardiovascular
training will help as long as the program is designed to slowly increase exercise demands.
References
Peterson, E. C., Wang, Z., & Britz, G. (2011). Regulation of cerebral blood flow. International
journal of vascular medicine, 2011, 823525. https://doi.org/10.1155/2011/823525
Powers, S., Howley, E., & Quindry, J. (2020). Exercise Physiology: Theory and Application to
Fitness and Performance (11th ed.). McGraw-Hill Higher Education (US).
https://mbsdirect.vitalsource.com/books/9781260813562
