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Summary Adaptions to Aerobic endurance Training Programs

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An in-depth summary of chapter 6, Adaptions to Aerobic Endurance Training Programs, from the Essentials Of Strength Training and Conditioning

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  • Chapter 6
  • February 22, 2023
  • 25
  • 2017/2018
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ADAPTIONS TO AEROBIC
ENDURANCE TRAINING
PROGRAMS
Chapter 6

, Page |1



Contents
Acute Responses to Aerobic Exercise....................................................................................................................................2
Cardiovascular Responses.................................................................................................................................................2
Cardiac Output..............................................................................................................................................................2
Stroke Volume...............................................................................................................................................................2
Stroke Volume cont’d....................................................................................................................................................3
Heart Rate..................................................................................................................................................................... 3
Oxygen Uptake.................................................................................................................................................................. 3
Blood pressure..................................................................................................................................................................5
Control of Local Circulation...............................................................................................................................................6
Respiratory Responses......................................................................................................................................................6
Respiratory responses Cont’d............................................................................................................................................7
Gas Responses................................................................................................................................................................... 8
Blood Transport of Gases and Metabolic By-Products......................................................................................................9
Chronic Adaptions to Aerobic Exercise................................................................................................................................10
Cardiovascular Adaptions................................................................................................................................................11
Respiratory Adaptions.....................................................................................................................................................11
Neural Adaptions.............................................................................................................................................................11
Muscular adaptions.........................................................................................................................................................12
Bone and Connective Tissue Adaptions...........................................................................................................................13
Endocrine Adaptions.......................................................................................................................................................13
Adaptions to Aerobic Endurance Training...........................................................................................................................14
External and Individual Factors Influencing Adaptions to Aerobic Endurance Training.......................................................18
Altitude............................................................................................................................................................................ 18
Hyperoxic Breathing........................................................................................................................................................19
Smoking........................................................................................................................................................................... 19
Blood Doping................................................................................................................................................................... 19
Genetic potential.............................................................................................................................................................20
Age and Sex..................................................................................................................................................................... 20
Overtraining: Definition, Prevalence, Diagnosis and Potential Markers..............................................................................21
Cardiovascular Responses...............................................................................................................................................21
Biochemical Responses...................................................................................................................................................21
Endocrine responses.......................................................................................................................................................23
Strategies for Prevention of Overtraining Syndrome......................................................................................................23

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Detraining:....................................................................................................................................................................... 24



Acute Responses to Aerobic
Exercise
Cardiovascular Responses
Primary functions of cardiovascular system during aerobic exercise = to deliver oxygen and other nutrients to the working muscles +
remove metabolites and waste products

Cardiac Output
 Amount of blood pumped by the heart in liters per minute
 Determined by the quantity of blood ejected with each beat and the hearts rate of pumping
o Q = Stroke volume x Heart rate
o Q = SV x HR
 Where Q= cardiac output:
o Stroke volume is measured in milliliters of blood per beat
o Heart rate is measured in beats per minute
 Progression from rest to steady-state aerobic exercise:
o Cardiac output initially increases rapidly, then more gradually and subsequently reaches a plateau
o Maximal exercise =may increase to 4x resting level
 5L/min to 20-22 L/min
 Stroke volume begins to increase at onset of exercise and continues to until oxygen consumption = 40%-50%
maximal oxygen uptake, SV begins to plateau at that point
o Sedentary college-aged men = maximal SV between 100-120ml blood pre beat
o College-aged women = 25% less due to smaller average body size + smaller heart
 Effect of training on responses to exercise + marked
o Increase in maximal SV for college-aged men up to 150-160 ml per beat + 100-110 for college-aged
women

Stroke Volume
 2 physiological mechanisms = responsible for regulation of stroke volume
1. End-diastolic blood volume
 Volume of blood available to be pumped by left ventricle at end of filling phase/diastole
2. Actions of Catecholamines including epinephrine and norepinephrine
 Hormones of sympathetic nervous system
 Produce more forceful ventricular contraction and greater systolic emptying of the heart
 With aerobic exercise, amount of blood returning to the heart (venous return) = increased due to combination
of :
1. Venoconstriction: induced via increased sympathetic nervous system activation
2. Skeletal muscle pump: muscular contractions combine with one-way venous valves to push more blood
to the heart during exercise
3. Respiratory pump: increased respiratory frequency and tidal volume

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