Kin4512_Chapter_7

Kin4512_Chapter_7 - PhysiologicalChanges:Health...

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Click to edit Master subtitle style Physiological Changes: Health  Related Physical Fitness Chapter 7 – Part 1 Cardiovascular Endurance
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Maintaining an active lifestyle is  linked to good health
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Are children and adults less active today? Are children and adults more overweight/  obese today? Is there a physical activity ~ health link? Fitness components : 1. Cardiovascular endurance- heart related 2. Body composition- obesity 3. Flexibility- low back pain
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Cardiovascular Fitness A form of muscular endurance – but related to heart  and cardiovascular system Efficiency of the heart, lungs, and vascular system in  delivering oxygen to working tissue The body’s ability to deliver oxygen to the muscle is  affected by Heart rate
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Cardiovascular Fitness:  Heart Rate (HR) The number of times the heart beats each  minute (bpm) Changes over the lifespan Fetal HR is rapid and irregular Birth HR is below fetal level with periods of  bradycardia (slow heart rate – HR< 60 bpm) 120-140 bpm on average
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Cardiovascular Fitness:  Heart Rate Children's HR  1 year ~ 80-100 bpm  HR will continue to decline at rest until  adolescence Adolescence Male ~ 57-60 bpm Female ~ 62-63 bpm 
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Cardiovascular Fitness:  Heart Rate There is a decline in HR  with age Researchers believe the  decline in HR with age is  due to a decrease in  myocardial (heart)  sensitivity to  catecholamines (functions as neurotransmitters and/ Changes over the lifespan  Overall, resting HR declines by  50% from birth to maturity Adulthood Average ~ 75-79
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Cardiovascular Fitness:  Heart Rate Maximal HR declines with maturity To predict maximal HR 220 - age= HR max (simple prediction  formula) HR max= 195 – 220 bpm Decline approximately 0.8 bpm/year of age Above formula uses 1 bpm/year of age  decline for making a prediction
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Cardiovascular Fitness:  Heart Rate To predict maximal HR in the  elderly HR max = 208 – 0.7 x (age in years)   HRmax= 208 – (0.7x70) HRmax = 159 bpm Calculate the predicted HR of a 70-year-old male
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Cardiovascular Fitness:  Heart Rate Work and HR Linear relationship As workload increases, HR increases Workload HR
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Cardiovascular Fitness:  Stroke Volume (SV) The volume of blood ejected from the heart  with each beat (ml/beat) Size of SV affected by Heart size Contractile force of the heart muscle Vascular resistance to blood flow Venous return
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Cardiovascular Fitness:  Stroke Volume SV is lower in children Due to smaller heart Lifespan changes Birth ~ 3-4 ml/beat Adolescence ~ 40 ml/beat Male adult ~ 70-90 ml/beat Trained male adult ~ 100-120  ml/beat
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Kin4512_Chapter_7 - PhysiologicalChanges:Health...

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