Strong Calves for Fast Running

Runners basically require every muscle in their bodies to be strong in order to run well and with less risk of injury. Even knowing this we continue to pick and choose what body parts we feel are more important when fitting in exercise. What ends up happening is we run out of time during our weeks and squeeze in a few squats and lunges, and maybe a couple of core exercises and head on our way to run. One muscle group that is often ignored is the calves, which are composed of two different muscles—the gastrocnemius and soleus muscles. Runners are not the only ones who require these areas to function at their best, but everyone is in need of strong and flexible calves for basic daily activities.

The basic function of the calf muscles is to lift the heels up and shift the body weight onto the toes. This motion is required for pushing off during stepping, whether running or walking, as well as climbing stairs. The other important role of the calves is for circulation. These muscles are in charge of pumping blood and fluids out of the lower legs and up to the heart. They perform this function by compressing the veins around them when contracting, forcing blood upward and out of the area. When the calf muscles are relaxed, especially for prolonged periods of time such as when sitting at work, the veins in the muscles and the surrounding area fill up with blood and fluid causing swelling.

Calves for Runners

The calf muscles are in charge of that final push-off during running to propel our bodies upward and forward. They play a crucial role in our stride length and pace. Since this muscle group is smaller than the other main groups higher up in the legs, the quads, hamstrings, and glutes, they fatigue at a much quicker rate during runs. During long runs and races, our slowed pace may be greatly due to the calves tiring out. Even if the hip flexors are significantly strong to drive our knees high during a stride or our quads strong enough to extend our leading leg far forward to lengthen our stride, our pace gets affected if the calves are too weak and tired to push off efficiently.

Runners must rely on the feet and ankles in order to keep sufficient balance. Running, especially fast running is considered a single leg balance movement, therefore our stability is important in order to master faster paces. The calf muscles play a role in this stability as they provide the strength required to prevent swaying forward. If the calves are not strong enough for this role, the end result is increased stress to the Achilles tendon. The same goes for insufficient strength for the push-off—the Achilles will have to take the load. Achilles tendon issues such as tendinitis and strains can be a prolonged and limiting condition for runners, which may lead to tendon tears—an issue that will leave you out of running for several months to over a year.

Calf Strengthening

Runners should incorporate exercises for the calf muscles two to three days per week, along with proper stretching techniques after runs. Focusing on both the gastrocnemius and soleus groups and other supporting ankle muscles is key to keeping proper stability in the feet and ankles. Basic standing heel raises are the most common way to strengthen the calves, but since the gastrocnemius group has two heads—the lateral and medial heads, ideally one should also perform heel raises with their toes pointing outwards as well as inwards. To strengthen the soleus muscle group, heel raises should be performed with the knees bent, as in a squat if standing or simply sitting with a dumbbell or other weight over the thighs for added resistance.

To keep the calves flexible, stretching after runs is important. The easiest stretch is to place the balls of the feet on a step, keeping the heel on the ground and lean the body forward. Keeping the knee straight will mostly stretch the gastrocnemius muscles while performing with the knee bent hits the soleus more effectively. Foam rolling is also another great way to break up any adhesions in the muscle groups that are causing tightness. Significantly tight calves are what leads to Achilles tendon strains, therefore runners should emphasize flexibility exercises as much as possible.

Other effective exercises to keep the calves strong and ready for running are plyometrics. Jumping rope, box jumps, squat jumps and any other explosive movements are great additions to your exercise program that will strengthen the fast twitch muscle fibers of the calves and Achilles tendon. Strong fast-twitch fibers are required to perform an efficient push-off during running. Adding in one or two plyometric moves to your warm-up routine before easy runs or in between other exercises is an effective way to incorporate calf strengthening even if you are short on time. If you want to be a fast runner, you must keep in mind that stronger muscles are needed for faster paces.

Sources

Samuel R. Hamner, Ajay Seth, and Scott L. Delp, Muscle Contributions to Propulsion and Support During Running, Journal, Jul 22, 2018

Achilles Issues & How to Fix Them

Some muscles work harder than others during running. One of these star players is the calves. Well, they pretty much work during every movement we do. Crossing both the ankle joint and knee joint, the calf is involved with any activity that requires us to push off of our toes. Not only that but they are also highly active when trying to control our descent during downhill running or walking. Since they play key roles during every part of running, we should be taking very good care of them every day. Strengthening and stretching the calves on a regular basis is an important part of training.

Having limited strength and flexibility in the calves leads to numerous injuries and pain including shin splints, plantar fasciitis, tendonitis, knee issues, and even hip and back issues over time. One common injury experienced by runners and many other athletes is Achilles’ tendinitis. The Achilles tendon is a thick band that connects the calf muscles to the heel of the foot. It is a prominent tendon in most people. All of the forces generated during running, especially during the push-off phase, are transmitted to the Achilles’ tendon. Faster running usually transmits more forces leading to injuries in the area.

What is Achilles’ Tendinitis?

When there is increased strain to the Achilles’ tendon, inflammation, irritation, and degeneration occur. The overworking of the tendon creates tiny microtears that weaken over time and can eventually lead to larger tears and ruptures. The most notable symptoms of Achilles’ tendinitis is visible swelling in the tendon, tenderness, and pain when first getting in up in the morning and when trying to stand on toes. Once it is warmed up the pain will usually subside and runners are able to run through it. As the condition worsens, the pain will gradually reappear and eventually limit the volume and speed of running. Tendon tears and ruptures will either have a visible bump over the area and commonly a gap where the tendon is ruptured.

Biomechanics

Although high volume training, speed training, and lack of strength are all causes of Achilles’ tendon issues, many physiological and biomechanical factors can increase the strain on the tendon and risk developing these problems.

Foot Strike

You have probably heard about how terrible heel striking is for runners. Well, the truth is that the research is inconclusive and heel striking actually works for some people. The reason this type of foot strike is related to Achilles’ tendon pain is that it involves increased stretching of the tendon. So if you already have tight calves to begin with, then the constant pulling during heel striking can lead to overstretching. The opposite type of foot strike, forefoot striking, actually creates a worse strain on the Achilles’ tendon. With this motion, you are basically landing on the toes and pushing off for the next stride all without giving the calves a break.

Pronation

Foot form is different for everyone. Flat-footed people or those with pronated feet (foot is turned inward when standing) will have a more strained Achilles’ tendon, as well as impeded blood flow to the area. There is already an area with limited blood supply, termed the “watershed area”, where the majority of tendon ruptures occur. This area is located about 4cm above the end point of the tendon on the heel. Limiting blood flow further as in the case of pronation will increase the risk of damage and slow healing on the tendon. Using supinated running shoes or inserts to decrease the amount of pronation is a treatment strategy.

Treatment & Prevention

Runners should focus on incorporating calf strengthening a couple of times every week, especially during their training seasons. Heel raises in all planes—toes pointed straight, toes pointed inward, and toes pointed outward are the main exercise for the calves. Seated heel raises or while in a squat position will help strengthen the soleus muscle, which is a muscle found deep under the gastrocs, the main calf muscles, that also connects to the Achilles’ tendon. Eccentric heel raises are the best way to strengthen the calf muscles as this will prepare the tendon for activities in which it is required to control the descent from extreme positions. To perform eccentric heel raises follow these steps:

1. Stand on a step with both heels hanging off.

2.  Lift both heels together.

3. Once completely on toes, shift all weight to only one leg and slowly lower the heel to just below the edge of the step.

4. Repeat 10-20 times on one leg, then repeat the same with the other leg.

Essentially this exercise will create a type of damage in the tendon, which strips away the previously damaged fibers and encourages the development of new fibers as a form of healing.

Runners should also incorporate stretching after every run and activity that highly involves the Achilles’ tendon such as hiking and climbing stairs. Stretching with both the knee straight and bent is important in order to include both the gastric and soleus muscles. Foam rolling is also helpful to break up any adhesions and extreme tightness in the muscles. Although strength training is time-consuming during training season, it is very important in order to prevent injuries. Achilles’ tendon injuries can be frustrating as they are frequently overlooked since the initial stages involve pain-free running. Taking care of Achilles’ issues from the start will involve a short rehab time while waiting until the pain is unbearable and affecting your running can leave you out of the sport for several months.

Sources:

Răzvan Aniţaş And Dan Lucaciu, A Study Of The Achilles Tendon While Running, Journal, Sep 07, 2018