ATP -The Immediate Energy Source

Various sports activities involve specific demands for energy. For example, sprinting and jumping are high - energy activities, requiring a relatively large production of energy for a short time. Long - distance running and swimming, on the other hand, are mostly low - energy activities per unit of time, requiring energy production for a prolonged time. Other physical activities demand a blend of both high - and low - energy output. These various energy demands can be met by the different processes in which energy can be supplied to the skeletal muscles.

Energy is produced from the breakdown of nutrient foodstuffs?' This energy is used to produce adenosine triphosphate (ATP), which is the ultimate usable form of energy for muscular activity. Adenosine triphosphate is produced in the muscle tissue from blood glucose or glycogen. Glucose is derived from the breakdown of dietary carbohydrates. Glucose not needed immediately is stored as glycogen in the resting muscle and liver. Stored glycogen in the liver can later be converted back to glucose and transferred to the blood to meet the body’s energy needs. Fats and proteins can also be metabolized to generate ATP.

Once much of the muscle and liver glycogen is depleted, the body relies more heavily on fats stored in adipose tissue to meet its energy needs. The longer die duration of an activity, the greater the amount of fat that is used, especially during the later stages of endurance events. During rest and sub maximal exertion, both fat and carbohydrates are used as energy substrate in approximately a 60% to 40% ratio.

Regardless of the nutrient source that produces ATP, it is always available in the cell as an immediate energy source. When all available sources of ATP are depleted, more must be regenerated for muscular contraction to continue.

Fatigue during Muscular Exercise

Muscular fatigue is usually defined as the inability to maintain a given exercise intensity. As we will see, there is no one cause of fatigue. Fatigue is task - specific and its causes are multifocal and vary from occasion to occasion. Fatigue during muscular exercise is often due to impairment within the active muscles themselves, in which case the fatigue is peripheral to the CNS and is due to muscle fatigue. Muscular fatigue can also be due to more diffuse, or more central, factors. For example, for psychological reasons an athlete may be unable to bring his or her full muscle power to bear in performing an activity. Alternatively, environmental factors such as hot, humid conditions may precipitate a whole series of physiological responses that detract from performance. In such cases, the cause of the fatigue resides outside the muscles.

Not only does the cause of fatigue vary with the nature of the activity, but the training and physiological status of the individual, as well as environmental conditions, affect the progress of fatigue during exercise. Fatigue can be due specifically to depletion of key metabolites in muscle or to the accumulation of other metabolites, which can affect the intracellular environment and also spill out into the circulation and affect the general homeostasis. The failure of one enzyme system, cell, or muscle group is likely to affect numerous other cells, organs, and tissues. Therefore, the causes of fatigue are interactive.

The study of fatigue in exercise has occupied the attention of many of the best biological scientists. Identifying a cause of fatigue is not simple, as it is often difficult to separate causality from concurrent appearance.

Common Sense Treatment For Majority of Back Pain

It's encouraging to know, however, that the majority of back pain can and should be treated without ongoing care or surgery. A good rule of thumb when caring for your back at home is to start small, simple, traditional remedies are the best way to go. Most pain can be treated with over-the-counter medications such as ibuprofen or acetaminophen. Intermittently applying ice and heat to the affected area is also effective for most people. Total bed rest is more harmful than good, however, because reclining for long periods of time can aggravate the discomfort by making muscles tighter. A better choice than bed rest is to avoid activities that increase your pain, but to maintain activities that do not. Keep moving, if possible, but use common sense when lifting and doing other activities that could worsen your condition.

Left untreated, back pain can increase greatly, so it's important to treat discomfort as early as possible. Failure to do so could eventually cause changes in posture and further muscle aggravation that could worsen the condition.

When a patient treats back pain with home remedies, in the majority of cases recovery takes less than four weeks. If pain persists past the four week point, you should see a doctor. But if your back pain is due to a fall or other trauma, see a physician immediately. It's also crucial to see a doctor when your pain could be due to a more serious illness. Though only one in 200 people has back pain solely as a symptom of something more dangerous, if you experience fever, bowel or bladder difficulties, unexplained weight loss, numbness tingling, or if you have a history of cancer or previous back injury, seek medical help immediately.