Manic depression, also known as bipolar disorder is connected to varying episodes of mood swings. This could range from low to manic high levels of a change in mood. The main cause of this discover has not been uncovered, however it is known to be as a result of a combination of alteration of the brain structure, environment, and genetics. Chemistry is also known to sometimes play a role in this disorder. People who suffer from manic depression can have periods when they are energized and happy and other periods when they feel very sluggish, hopeless, and sad.
The status of the elderly in the US hasn't changed that much compared to traditional societies because they both have lowered the status of the elderly in their societies. Lives are happier in modern society because people have medical care that they didn't have access to before
60 - 70% of maximum heart rate: This zone provides the same benefits as the healthy heart zone, but is more intense and burns more total calories. The percent of fat calories is remains up to 85% in this zone.
