Running is an efficient form of cardiovascular activity that can reduce your risk of chronic conditions such as heart disease and Type 2 diabetes. Running can also help you lose weight and tone the muscles of your legs, improving your metabolism, explains Washington State University in their online publication "Cardio." Despite its positive health benefits, running is also an activity that places significant demands on your body. Shaking after running can indicate that your body has exceeded its capacity for recovery in some way.
Low Blood Sugar
Low blood sugar, also known as hypoglycemia, occurs when your body runs low on glucose. Without glucose, your body and brain don't have fuel to keep them running smooth, explains the University of Maryland Medical Center in their online publication "Hypoglycemia." Symptoms of low blood sugar include shakiness, headache, excessive perspiration and sudden onset of fatigue. Low blood sugar is more commonly experienced in individuals with diabetes, because they have difficulty maintaining stability blood sugar levels. Individuals who don't have diabetes, however, can also experience a drop in blood sugar that leads to shaking. Low blood sugar is usually remedied by eating or drinking something that is a quick source of glucose, such as orange juice.
Running for extended periods or at high rates of speed can make an already physically demanding activity even more strenuous. Muscles can start to shake as a result of muscular fatigue that can emanate in the brain or in the muscles themselves. Regardless of the origin, pushing your body to the point where it can no longer maintain electrical impulses properly can lead to shaking. This phenomenon is due in part also to the expenditure of oxygen to the muscles when running, explains a 1979 article published in "Medicine and Science in Sports."
After a run, you may notice your muscles are twitching, making it appear, and feel like, shaking. Twitching of your muscles is actually a contraction of the muscle fibers, explains Medline Plus in their online publication "Muscle Twitching." The causes of muscle twitching vary but can include consumption of stimulants like caffeine, side effects of medications such as diuretics, and stress. In most cases, muscle twitching is benign and subsides over time, after your body has had time to recover from running. If, however, shaking that appears to be muscle twitching continues, see your physician. Ongoing muscle twitching can indicate medical conditions such as neurological problems.
The mineral magnesium is essential for the functioning of every organ in your body, explains the University of Maryland Medical Center in their online guide "Magnesium." Running, which typically leads to significant sweating, can lead to a deficiency of this mineral. Although a magnesium deficiency is considered rare, individuals who sweat frequently, consume caffeinated beverages and experience chronic stress can end up excreting a significant amount of this mineral. Shaking is one of several symptoms of a magnesium deficiency, which can also lead to muscle spasms, low blood pressure and fatigue. If you believe you may have a magnesium deficiency, speak to your physician for possible magnesium supplementation.