The 5 Immediate Physiological Responses to Exercise

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The 5 immediate physiological responses to exercise The five immediate physiological responses to exercise are heart rate (HR), Stroke Volume (SV), Cardiac Output (CO), ventilation and lactate levels. These five physiological responses change during different levels of exercise and are different pre and during exercise. The responses also vary for trained and untrained athletes. Heart rate can be defined as the number of times the heart beats per minute. There are three different values of heart rates; resting HR (at a steady state/pre exercise), Working HR (working at 65%- 75%, during exercise) and max HR which is the maximum your heart should pump at for extended periods of time and is calculated by 220 minus your age. Generally, the fitter you are the lower your resting HR will be, likewise if you are overweight or unfit you will, in result, gain a higher resting HR. The average resting heart rate for adults is 60-80bpm, and the normal HR for conditioned/trained athletes is 40-60bpm. This demonstrates their high level of cardiovascular fitness, and how it lowers their HR. During exercise your heart will rise and then level off, depending on your level of fitness. A person’s working HR displays the intensity of their workout. A trained athlete can work for longer periods of time at a higher level whereas an untrained athlete’s HR would level off in a smaller period of time and less intensity. Stroke Volume is the amount of blood pumped by the left ventricle in each beat, measured in mls/beat. As intensity during exercise increases so does SV. SV does have a maximum volume this can vary due to fitness level, ventricle elasticity and the blood to return to the heart. The biggest change in SV occurs from moderate to intense exercise. An average untrained athlete would have a SV 60-80ml/beat, and a trained athlete 160ml/beat. The higher the stroke volume the

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