Pre- and Post-Workout Carbohydrates

Carbohydrates are important before your workout, to provide fuel for your exercise session; and after your workout, to replenish glycogen (the stored form of glucose) stores in your working muscles.

But, what are the best types of carbohydrates to consume before and after your workout?

The glycemic index (GI) is a way of measuring the body’s response to food.  A high GI food will cause a rapid and high elevation in blood glucose and a commensurate rise in blood levels of insulin.  Conversely, low GI foods will lead to a slower, more sustained blood glucose concentration.

Processed foods and foods with added sugar tend to have higher GIs; while less processed foods — including whole grain, high-fiber carbohydrates — usually have lower GIs.  Foods with carbohydrates that also have protein and/or fat also tend to have lower GIs, such as milk and dark chocolate.

Although the quality of your pre-workout meal or snack may not always significantly impact performance, studies lean toward a rationale for low GI carbohydrates before a workout, especially if the workout is longer in duration.

To accelerate restoration of glycogen stores following a workout, high GI carbohydrates may be a better choice.  High GI carbs are also appropriate between games of a double-header, or at half-time of a sporting event.

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