Q.Discuss in detail 2 long term and 2 short term effects of exercise on cardio respiratory system.
You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.
Start your 14-day free trial to unlock the full solution →Exercise triggers immediate changes (increased heart rate, breathing rate) and, over time, builds a stronger, more efficient cardio-respiratory system with lower resting heart rate, greater lung capacity, and improved oxygen delivery.
When you begin to run, swim, or cycle, your body faces an immediate challenge: working muscles demand far more oxygen than they do at rest, and they produce carbon dioxide that must be expelled quickly. The cardio-respiratory system—your heart, blood vessels, and lungs working as one integrated unit—responds both in the moment and, if you train regularly, adapts permanently over weeks and months. Understanding these short-term and long-term effects reveals how the body becomes fitter, more resilient, and capable of sustained physical effort.
Short-Term Effects: The Immediate Response
The moment you start exercising, your cardio-respiratory system shifts into a higher gear. Two changes dominate this acute response.
1. Increased Heart Rate and Cardiac Output
Your heart beats faster—sometimes doubling or tripling its resting rate within minutes. A sedentary person's heart might pump around 5 litres of blood per minute at rest; during vigorous exercise, this can surge to 20–25 litres per minute or more. This happens because each working muscle fibre needs a constant supply of oxygen and glucose, and the only way to deliver them quickly is to circulate blood faster. Stroke volume (the amount of blood ejected per beat) also rises, especially in trained individuals, so the heart doesn't just beat faster—it pumps more forcefully with each contraction.
2. Increased Breathing Rate and Depth
Your lungs respond just as dramatically. Breathing rate climbs from a resting 12–15 breaths per minute to 40–50 or higher during intense effort, and each breath becomes deeper, pulling more air into the alveoli where gas exchange occurs. This ventilatory response ensures that oxygen floods into the bloodstream while carbon dioxide—a waste product of cellular respiration—is expelled. You feel this as shortness of breath or heavy breathing; it's the body's way of matching oxygen supply to the sudden spike in demand.
Blood is also redistributed during exercise: vessels supplying the digestive system and kidneys constrict, while those feeding skeletal muscles and the heart dilate. This ensures that oxygen-rich blood reaches the tissues that need it most.
Long-Term Effects: Structural and Functional Adaptations
If you exercise regularly over weeks and months, the cardio-respiratory system doesn't just respond—it remodels itself. These chronic adaptations make the system more efficient, so the same level of effort feels easier and your capacity for work increases.
1. Cardiac Hypertrophy and Lower Resting Heart Rate
The heart muscle itself grows stronger and thicker, a phenomenon called cardiac hypertrophy (specifically, the beneficial kind seen in athletes, not the pathological thickening from disease). The left ventricle, which pumps oxygenated blood to the entire body, enlarges and its walls become more muscular. This means each contraction ejects more blood—stroke volume at rest can rise from around 70 ml to 100 ml or more in trained individuals. Because the heart pumps more blood per beat, it doesn't need to beat as often to meet the body's resting needs. A sedentary person might have a resting heart rate of 70–80 beats per minute, while an endurance athlete's can drop to 40–50. This lower resting heart rate is a hallmark of cardiovascular fitness and reflects a more efficient, less stressed heart.
2. Increased Lung Capacity and Capillary Density …
Unlock everything free for 14 days
- Full step-by-step solutions
- Concept-first explanations
- Methods, shortcuts & mistakes
- PYQ mapping + timed mock tests
Full access for 14 days. No credit card required.