| Isotonic contractions | Isometric contractions |
| The size of the muscles varies | The size of muscles remains constant |
| Tension does not change | Tension varies |
| Shorter latent and contraction time with an extended relaxation time | Longer latent and contraction time with a reduced relaxation period |
| A rise in temperature increases the shortening period | Rise in temperature reduces isometric tension |
| An isotonic contraction produce less energy since more heat is being released. | Isometric contractions produces more energy since less heat is being released |
| Shortening occurs due to an external work being done | Shortening does not occur since there is no external activity being done |
| Isotonic contractions happen during the process of a muscle contraction | Isometric contraction happens at the start and end of muscle contractions. |
| Isotonic contractions reduce when the load becomes more during muscle contractions | Isometric contraction rises when load increases during muscle contractions |
Comparative Table between Aerobic (Endurance) and Anaerobic (Resistance) Exercises
| Aerobic | Anaerobic |
| Aerobic activity uses Slow-twitch muscle fibers. | Anaerobic activity uses fast-twitch muscle fibers |
| Aerobic activity is carried out constantly which favors cardiovascular conditioning and muscular endurance | Anaerobic activity is carried out in quick periods and results to greater strengths. |
| Aerobic exercises uses oxygen during an activity which enables runners to run for long distances | Anaerobic exercise uses energy from the muscle storage during an activity and requires short exercises such as jogging. |
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The different ways living organisms obtain energy
On the other hand, living organisms obtain and use energy through three different processes. These processes include catabolism, metabolism and anabolism. To start with, catabolism process also known as destructive catabolism occurs when cells breakdown multifaceted substances as well as molecules into less complex substances to release energy for use. Meanwhile, Anabolism process also referred to as constrictive anabolism entails living organism using simpler substances or develop multifaceted substances for instance proteins, fats and carbohydrates for storage. Lastly, metabolism is the combination of processes, anabolic activity and catabolic activity inside the cells of living organisms to produce energy.
