The 100-Mile Week: Should You Try It?

Training for a marathon requires more time and effort than most think. It is not all about just running. Getting your body to be able to reach 26.2 miles safely and injury-free requires several other components. The priority should be to make sure we can get to that 26.2-mile mark without getting injured, burnt out, or being zombie-like throughout the entire process. Besides running several days per week, training will require extra time for strengthening sessions, stretching and more sleep. Because of this, there are a variety of different training plans you may find that are a “minimalist” approach, which include the least amount of mileage per week that will get you ready for race day.

On the opposite spectrum, there are those hard-core marathoners who have been training for years and attempt those very high mileage weeks without a problem. The most difficult part of this type of high volume training is the amount of time it requires. If you have a regular work schedule and a family to tend to, the hours remaining in your day will just be for training and sleeping. Evidently, you must be okay with the sacrifice. For the regular person, a normal training plan will usually consist of 50 to 60 miles per week at the most, whereas high mileage would be considered 75+ miles. Scattered throughout the week with some days including a morning and evening run, it can definitely be doable.

What about the elite runners out there hitting 130 miles per week? It sounds crazy but there is a science behind this extraordinary mileage. The classic 100-mile week is something even the everyday hard-core marathoners try to achieve. Some may say it is completely unnecessary, and that may be so, but if research shows a benefit to getting you to that next level, it may be worth a try. Fifty miles per week probably feels hard enough when first starting out, so considering doubling up your training will most definitely seem impossible. The key to getting to this point is to gradually and safely increase the workload. And no, this training approach isn’t for everyone OR the only way to progress in distance running.

Why 100?

Running Economy

Well, training to hit a weekly mileage of specifically “100” miles is merely just to get to the triple digits, because in essence 95 miles will provide the same benefit. Several studies have been done on high volume training and have concluded that there are many benefits linked to improving running economy. Basically, this means the more miles you run the less your body will have to work during the race, allowing you put that extra energy into faster paces. This is due to muscle and tendons training to adapt to prolonged running. These adaptations lead to increased elasticity of joints including the ankle, which in turn leads to a more forceful and less vertical push-off from the ground with each step. This will save a good amount of energy over time.

Aerobic Endurance

The goal of marathon training is to get our bodies to be able to run far, and if possible, fast.. The higher mileage programs essentially increase the amount of mitochondria and capillary density in the body, as well as hemoglobin and red blood cells. The growth of these factors leads to more and better oxygen transport through the blood cells to the muscles. This is why marathoners are eventually able to run farther and faster over time. Once you train to run more miles your body will learn to use fat as fuel and store more glycogen, which means more energy will be readily available for when you really need it, like at the end of a race.

Resistance to Fatigue

When you go from running 50 or 60 miles per week to 100 miles per week, the majority of those extra miles should all be performed at a slow, easy pace. The lower intensity, high mileage prepares not only our bodies for long races but also our minds. When you ask someone who is not a runner how they feel about running 26.2 miles, they will most likely think it’s a crazy idea. That’s because our minds become just as fatigued at the thought of running for so long as our bodies do. Many of the training runs in a 100-mile program will be 10-15 mile easy runs, where your body will undergo uncomfortable fatigue and soreness at times. It is during these long, slow runs that we get our mind accustomed to this sensation so that come race day, we can push through it.

Should I Try It?

Training to reach a weekly target of 100 miles is definitely not easy, but it is doable. The difficult part besides the extra time and sacrifice it will require is the high risk of injury it brings. More time on your feet means more chances of both accidental injuries as well as overuse-type injuries. It is important to gradually increase mileage every week. This means setting enough weeks in your training cycle to build up to 100 miles with no more than 5-10% increases per week and low mileage weeks built in every few weeks. The most important rule is to listen to your body not only for signs of pain but also for symptoms of overtraining and fatigue as well. Along with the 100 miles should also be at least 7 to 9 hours of sleep each night and 2 to 3 days of strengthening exercises. If these components are possible with your schedule then incorporating this extraordinary mileage program can be attainable.

Balanced Hormones for Better Performance

The body undergoes several different changes during exercise. As much as non-runners may constantly tell their running friends how bad the sport is for the knees or heart, the fact is quite the opposite. Running produces an extraordinary amount of benefits to the body. From better heart health, to improved lung function and joint mobility, runners have an advantage towards a longer and more satisfying life. Many of the benefits and changes that occur during training are straight forward, while others are harder to understand. The effect on the endocrine system is one of the more confusing topics for runners. The endocrine system is responsible for the secretion and regulation of the body’s hormones, which play a significant role in performance improvement.

It is useful for athletes to understand the function of different hormones in order to train properly and safely for endurance events. In many cases, too much information on the benefits of certain hormones has caused some athletes to go to extremes trying to increase the amount in their bodies. From sleeping in high elevation to using performance-enhancing drugs—there are definitely many ways to ‘artificially’ raise hormone levels in the body, but with negative consequences, and possibly no beneficial outcomes. The key to getting the most benefit from the endocrine system for running performance is to keep hormonal balance. When it comes to training, the most important hormones to pay attention to are growth hormone, insulin-like growth factor, cortisol, and testosterone.

Growth Hormone

The pituitary gland in our brains naturally secretes growth hormone in bursts, usually following stress, exercise, or trauma. Although the levels of this hormone vary throughout the day, it is usually increased during the night. Since growth hormone is responsible for the development of bones and cartilage, it makes sense that more of it is produced during childhood and adolescent years as opposed to adult years. The role of growth hormone for runners, or any athlete for that matter, is to facilitate adaptation to exercise, which naturally occurs during rest and recovery periods. It stimulates protein production and helps the body utilize fat for energy, therefore helping runners last longer during endurance events. This is a commonly used performance-enhancing drug in the bodybuilding world as well, since it helps promote gains in size and strength.

Insulin-like Growth Factor

Insulin is produced by the pancreas and is responsible for storing glycogen and glucose in the body. During exercise insulin is suppressed to ensure that glycogen is used as fuel instead of for storage. Insulin-like growth factor has the same structure as insulin, except it is produced in the liver. This hormone works alongside growth hormone to help repair muscle damage caused by exercise. These factors make artificial supplementation attractive to athletes. Although this hormone is considered a banned substance, many are still using it despite the significantly negative side effects. Since insulin-like growth factor contributes to muscle growth and repair, it has been linked to cell growth as well, allowing tumors to survive and possibly grow, increasing the risk of death from cancer. Making sure to supply the body with adequate food, especially from animal proteins, is helpful in naturally maintaining a proper balance of this hormone.

Cortisol

You have probably heard of this hormone when reading or learning about stress and the “fight or flight” response. Cortisol is a hormone produced in the adrenal glands of the body. The natural response during any stressful situation is for these glands to secrete cortisol temporarily to keep our mental state more alert and our bodies ready for action. Hard training puts the body under a type of stress that creates a similar response. The problem with cortisol is the negative effects from its prolonged elevated levels, which is common during overtraining. Too much cortisol breaks down muscle tissue and stores more fat in cells. This eventually leads to a decrease in performance. One way to combat this imbalance is to include proper rest into training plans and avoid overtraining syndrome, which includes symptoms of exhaustion, poor performance, and irritability.

Testosterone

When it comes to running, testosterone is responsible for supporting the growth of muscles and aiding in recovery. Intense workouts, such as interval training or speed work can increase testosterone in the body leading to muscle mass gains and shorter recovery periods over time. Overtraining and prolonged running can decrease levels. Testosterone is another commonly used performance-enhancing drug by endurance athletes for the shorter recovery benefit and bodybuilders for the massive muscle gain benefit. Negative side effects of high testosterone levels are numerous and include behavioral changes, increased risk of heart attack, impotence, and acne. Balancing testosterone levels to benefit your running naturally is as easy as mixing up your running plan and adding in high intensity sessions.

These four hormones are just a few of the many that are involved in running performance. As with any stressful situation, including trauma, injury, and personal tribulations, running increases and/or decreases the levels of hormones in the body. This response is a natural one. Understanding the effects of hormonal imbalance is important in order to learn ways to manage. Artificially increasing hormone levels for the sake of performance improvement does give athletes an advantage, which is why these practices are banned from sports. It is always best to naturally balance out hormone levels, instead of exaggerating the levels of some, in order to avoid harmful side effects.

Sources

R. R. Kraemer, R. J. Durand, E. O. Acevedo, L. G. Johnson, G. R. Kraemer, E. P. Hebert, V. D. Castracane, Rigorous Running Increases Growth Hormone and Insulin-Like Growth Factor-I Without Altering Ghrelin, Journal, Dec 23, 2019.

K. Karkouliasa, I. Habeosa, N. Charokoposa, M. Tsiamitaa, A. Mazarakisb, A. Poulib, K. Spiropoulos, Hormonal responses to Marathon Running in Non-Elite Athletes, Journal, Dec 23, 2019.

C G Semple, J A Thomson, and G H Beastall, Endocrine Responses to Marathon Running, Journal, Dec 23, 2019.