Cardiorespiratory Responses to Acute Exercise

15問 • 2年前

問題一覧

• Heart rate (HR), stroke volume (SV), and cardiac output (Q) increase. • Blood flow and blood pressure change. • All result in allowing the body to efficiently meet the increased demands placed on it.

• 60 to 80 beats per minutes (BPM) • can range 28 BPM to above 100 BPM • tends to decrease with age and increased cardiovascular fitness • is affected by environmental conditions such as altitude and temperature

Resting Heart Rate

• The highest heart rate value one can achieve in an all-out effort to the point of exhaustion • Can be estimated HR max = 220 - age in years • Remains constant day to day and changes slightly from year to year

Maximum Heart Rate

• Heart rate plateau reached during constant rate of submaximal work • Optimal heart rate for meeting circulatory demands at that rate of work • The lower it is, the more efficient the heart

Steady - State Heart Rate

is the volume of blood pumped out of the left ventricle of the heart during each systolic cardiac contraction.

Stroke Volume

• Determinant of cardiorespiratory endurance capacity at maximal rates of work • May increase with increasing rates of work up to intensities of 60% of max • May continue to increase up through maximal exercise intensity • Depends on position of body during exercise.

Stroke Volume

more blood in the ventricle causes it to stretch more and contract with more force

Frank starling mechanism

• Resting value is approximately 5.0 L/min • Increases directly increasing exercise intensity to 20 to 40 L/min • Value of increase varies with body size and endurance conditioning • When exercise intensity exceeds 60%, further increases in Q are more a result of increases in HR than SV

Cardiac Output

• Gradual decrease in stroke volume and systematic and pulmonary arterial pressures and an increase in heart rate. Occurres with steady state prolonged exercise or exercise in a hot environment. • the progressive increase in heart rate and decrease in stroke volume that begins after approximately 10 min of prolonged moderate-intensity exercise, is associated with decreased maximal oxygen uptake, particularly during heat stress.

Cardiovascular Drift

CARDIOVASCULAR ENDURANCE EXERCISES • increase in direct proportion to increase exercise intensity. • changes little, if it all during endurance exercise, regardless of intensity.

Systolic BP, Diastolic BP

RESISTANCE EXERCISE • It exaggerates bp responses to a high as ________ mmHg • Some BP increase are attributed to the ___________

480/350, valsalva maneuver

is a measure of the force blood exudes on the arterial wall during the heat's contraction or pumping phase known as systole and relaxation known as diastole.

Blood Pressure

Pressure is usually measured noninvasively with a sphygmomanometer. 120/80 = 129/80-139/89 = 140/90 =

normal, pre - hypertensive, hypertensive

• decreases during exercise due to water being drawn from the blood plasma and out of the body as sweat. • excessive loss can result in impaired performance

Blood Plasma Volume

Breathing Problems • is the shortness of breath and the feeling that you can't get enough air into your lungs. • that's when you inhale much deeper and take much faster breaths than normal. • a breathing technique to trap and pressurized air in the lungs, it can reduce the cardiac output.

Dyspnea, Hyperventilation, Valsalva Maneuver

INTRODUCTION TO PHYSIOLOGY OF EXERCISE AND PHYSICAL ACTIVITY OF EXERCISE

Federico Lasco Sinogbuhan · 15問 · 2年前

INTRODUCTION TO PHYSIOLOGY OF EXERCISE AND PHYSICAL ACTIVITY OF EXERCISE