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Should You Run 26.2 Miles Before Racing A Marathon?

Posted by: on January, 25 2016

Found on Competitor.com and written by Jeff Gaudette

Find the balance between the optimal training schedule and getting the most enjoyment from your running.

In the past, I’ve outlined how you canincorporate shorter, more “fun-oriented” races into your schedule while still keeping the integrity of your training plan intact. You may have noticed that I made no mention in that article of how to integrate marathons into your schedule—should you be thinking of including an easy 26.2-mile run as either a long run or a fun run.26.2

Believe it or not, it’s a question I receive often: “Would it be a good idea for me to run a marathon as a long run with my friends before my goal race?”

I can understand the sentiment behind the question. The atmosphere at a marathon is electric and with all the likeminded runners around you, the miles can fly by in a way that’s not easily replicated on a training run. Unfortunately, if you want to maximize your chances of a personal best at your next goal race, I don’t recommend running a marathon in training—either as a course-supported long run, or for the atmosphere and the camaraderie.

Here’s the short reason why: In addition to offering very little training benefit, the 26.2-mile distance is difficult to recover from (yes, even if you run easy) and you risk becoming derailed from your optimal training routine for 10-14 days. Don’t just take my word for it, however. In the next few pages we’ll explain some of the science behind why you should avoid running a marathon as a long run or fun race.

A Tough Toll On The Body

Bones, muscles, tendons, ligaments and almost every physiological system is challenged when running a marathon. It doesn’t matter if you’re running easy: at the end of the day 26.2 miles is 26.2 miles, and your body endures tremendous physical duress when running that long. Here’s a scientific look at some of the systems that are most effected after running 26.2 miles:

Skeletal Muscle
Muscle soreness and fatigue are the most obvious cases of damage caused by running the marathon distance. One scientific study conducted on the calf muscles of marathon runners concluded that both the “intensive training for, and the marathon itself, induce inflammation and muscle fiber necrosis that significantly impaired muscle power and durability.” Even if you you’re not feeling too beat up after running 26.2 miles, your muscles are undoubtedly weakened and need extensive recovery before returning to full training.

Cellular Damage
Cellular damage post-marathon is best measured by the presence and production of creatinine kinase (CK)—a marker that indicates damage to skeletal and myocardial tissue, and increased myoglobin levels in the bloodstream.

One study concluded that CK damage persisted more than 7 days post marathon while another study discovered the presence of myoglobin in the bloodstream for 3-4 days post race. Both of these studies clearly indicate that the body needs rest after a marathon to fully recover from the cellular damage caused during the race.

Training Benefits

According to data derived from statistics made available by Running USA, most runners training for the marathon are averaging anywhere from 8 to 11 minutes per mile on their long runs (training paces for a 3:30 to 5-hour marathon race finishing time). At a pace of 9 minutes per mile, a runner will take roughly 3 hours to finish a 20-mile run. While there is no doubt that a 20-mile run (or longer) can be a great confidence booster, from a training and physiological standpoint, they don’t make much sense. Here’s why:

Most coaches and exercise scientists now know that your body doesn’t see a significant increase in training benefits after running for 3 hours. The majority of physiological stimulus during long runs occurs between the 90 minute and 2:30 mark. This means that after running for 3 hours, aerobic benefits (capillary building, mitochondrial development, myoglobin levels) begin to actually stagnate or decline instead of improving. Therefore, doing a marathon as a long run builds about as much fitness as your normal 20-22 mile run.

While you might be OK with not building any additional fitness when doing your fun marathon long run, the downside is that the longer you run, the more you increase your risk of injury. While the extra 6 miles to go from 20 miles to the full marathon distance might not seem like much, muscle fatigue increases exponentially with every mile. During those last 4-6 miles, your form begins to break down, your major muscles become weaker, and overuse injuries begin to take their toll—even if you’re running easy. This risk of injury over these last few miles is more prevalent for newer runners whose aerobic capabilities exceed their musculoskeletal readiness. In simpler terms, a newer runner’s body isn’t ready to handle the kind of stress that their lungs can withstand.

Finding The Right Balance

If you’re still determined to run the marathon as part of your training, either to enjoy the experience, help a friend or another reason, you can always cut back on the total distance by either jumping in at 5-6 miles or stopping at 20-21 miles, or the point when your long run would normally end.

If you’re pacing a friend, the start of a race is too congested to be of much assistance anyway. You’re better served jumping in at 6 miles (when the crowds begin to thin out) and being a little more fresh during the last 6 miles to help give the pacing and motivation your running partner needs.

Conversely, if you’re running the marathon just to enjoy the experience or have some company, starting the marathon still allows you to appreciate all the pre-race energy and excitement. However, stepping off the course at 20-22 miles will allow you to recover faster and keep your training schedule on track. Since you’re not running for a time, and just want to enjoy the experience, not finishing shouldn’t be an issue.

As I’ve mentioned before, it’s important to find the balance between the optimal training schedule and getting the most enjoyment from your running. However, in this case, running a marathon as part of your training just doesn’t make sense. Get creative or think about the big picture and you’ll enjoy success at your goal race and keep training fun.