Acidic and alkaline water, pH all water and all aqueous solutions contain both H+ and OHâ ions. If the quantity of H+ exceeds that of the OH-, the water is said to be acidic. If there are more OH-ions than H+, the water is alkaline. Pure water, which contains equal numbers of both ions, is said to be neutral. Chemists express the degree of acidity or alkalinity on the pH scale which runs from about 0 to 14. Acidic solutions have pH values of less than 7, alkaline solutions more than 7.
Examples of aerobic exercises include marathon running, long-distance cycling and walking. Even meditative exercises, such as yoga and tai chi, can be called aerobic because aerobic respiration is still the dominant energy system your body uses, even if the intensity is much lower than running.
Aerobic Versus Anaerobic Activities. When you perform short and intense activities that require maximal energy, you rely on your anaerobic metabolism. For example, the energy used to run a 100-meter sprint is about 100 percent anaerobic. The primary nutrient for this type of exercise is carbohydrates.hen a glucose molecule is converted into carbon dioxide and water via aerobic metabolism, it produces 39 molecules of ATP. However, glycolysis requires powerful enzymes that compensate for the lower energy efficiency of anaerobic metabolism.