By Beth Mansfield, Sport Dietitian and Exercise Physiologist
Moderate to intense physical activities done for prolonged periods of time can lead to high sweat rates and an increased risk for dehydration and significant mineral losses, particularly sodium. Losing too much sodium can dilute the concentration of electrolyte minerals in the blood, effectively impairing our ability to regulate our internal temperature, maintain an optimal fluid balance, and ensure peak athletic performance.
Electrolyte containing drinks (e.g. sport drinks with sodium) and foods (e.g. salted pretzels) stimulate thirst, thereby encouraging a greater voluntary intake of fluid while optimizing sodium levels lost through sweat. This is important for very young athletes and older, masters athletes as their thirst mechanisms tend to be suboptimal. Foods and fluids containing sodium also help with recovery as the sodium has been shown to stimulate the process of post workout rehydration. Sodium, in appropriate concentrations, appears to enhance the rate of fluid absorption from the small intestine into the blood stream, especially when glucose is in the gut at the same time. So a sport drink effectively addresses fluid, sodium and glucose needs for effective maintenance of hydration and sodium balance during exercise.
BUT...does this mean that those of us that are involved in this type of training need to top up sodium intakes with electrolyte sport drinks and more liberal use of the salt shaker? Use the following checklist to evaluate your current salt intake:
If you said NO to three or more of the questions, then you are likely getting more salt than you need in your daily diet. Even if sodium intakes are on the low side, the body adapts by minimizing sodium losses in both sweat and urine, making deficiencies unlikely.
Some people over 50 years of age are sodium sensitive and experience high blood pressure with excess sodium (salt) intake. This might also be a sign that you should follow the DASH diet (dietary approaches to stop hypertension also known as high blood pressure). The DASH diet, which emphasizes fruits, vegetables and low-fat dairy products, and includes grains, nuts, poultry and fish, is not only good for reducing blood pressure, it is also a pattern of eating for peak sport performance!
For more nutrition information from Beth Mansfield, and a list of upcoming sport nutrition workshops, check out Beth’s website at www.peakperformance.ca.
Beth Mansfield is a Sport Dietitian and Exercise Physiologist at Peak Performance in Ottawa.
Last month we put a call out for favourite running recipes and received this dynamite post-workout smoothie recipe from Alex McGowan.
Shortly after finding Alex’s simple instructions in our inbox we cued up the blender and got to work. We were missing the protein powder and instead of chilled we used a straight-up frozen banana that was taking up space in the freezer (thawed out about 20 seconds in the microwave). We also combined almond and peanut butter. Results? Delicious awesomeness.
So, now we’ve got extra reasons to go for that hard run. A tasty, nutritious post-run recovery snack. And a way to clear some space in the freezer. Thanks Alex!
Alex’s Post-Workout Smoothie
Toss all ingredients in the blender, blend until smooth, and enjoy!
“This is perfect after a hard run; it helps cool you down, goes down smooth like water and helps hydrate, and is easy to digest if your stomach is a bit unsettled. The combination of the protein powder and Greek yogurt gives muscle-rebuilding protein, and the almond butter gives healthy fats to fill you up. The cocoa powder provides a punch of antioxidants, and it gives the entire thing a major flavour boost! Lastly, the banana gives some substance to the snack and has all that potassium to help fight off muscle soreness and cramps. A perfect post-workout recharge!”
Have a recipe to share? Send it to [email protected]. Published recipes receive both bragging rights and a cool Run Ottawa gift.
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