What makes us faster?

Running adaptations
Let's talk some more about how the body changes and what you can expect and be aware of as your new physicality in this sport begins to develop. Bear in mind that this is what you will be observing over 20 weeks – not next week.
A quick review of running anatomy; Cardiac muscle will adapt first, respiratory systems next, and then body musculature, your foot strength, and then connective tissue. This order of business cannot be put into fast forward nor can the order be changed for most folks. Patience is very important. If the body feels ready in one department it may not be ready in all departments without the requisite mileage. Remember our mantra of “train, don’t strain” that comes from Arthur Lydiard.

Cardiac capability – You heart is quite possibly the hardest working muscle in the body and will adapt very quickly if you gradually increase the training loads. One of the best ways to measure this adaptation is to know your resting pulse and then check your pulse right after finishing a run. Continue to check it every 30 seconds or so following the run to see how quickly it returns to normal resting rate. While you may not always run faster each day – if you see your pulse drop to normal more quickly – you have a great reassurance that your body is working more efficiently. This means you can run more easily and farther without duress. Endurance of this type allows you to have muscles contracting consistently for longer periods of time and this is a benefit for any activity you choose to participate in; Arthur Lydiard trained all types of Olympic athletes for their respective sports by increasing their stamina.
Dr. Philip Maffetone discusses the idea of being able to run the same distance, over each successive month, at a slightly faster or more efficient pace as your cardiac capacity improves. Even if your speed never significantly increases – you ease into performing at this effort will improve gradually improve. How well you cover ground at a given heart rate, as well as how fast you return to your baseline heart rate – are good indicators of adaptation.

Proprioception - You ability to “body sense” and kinetically know where you feet are; where they are in relationship to your legs or ankles, what you arms are doing while you run are some basic examples of proprioception. How many of us can stand on one leg with our eyes closed? If you practice this skill over time your body becomes more tuned into where you are in time and space. This skill is developed daily in running as we are falling down & catching ourselves with the next stride. Two attributes to refine in our body awareness while running are; making sure we are projecting most of our energy into moving forward, making sure we are landing on the ground with quiet feet. We have discussed running form in other classes and this kind of gradual awareness of how you are running will greatly enhance how well you run and keep you running farther over successive weeks. Don’t tune out your body – listen to it and focus on what you are experiencing.

Pacing – Can you start slow? Can you run a 13:00 mile, a 12:00 mile and an 11:00 mile? These are skills that take time to develop and are essential to the runner for best tactics while racing and training. After you develop the ability to hold yourself back, and adjust your expectation of running pace - then after eight week or more we’ll begin to develop the ability to slowly speed up over the course of a run. You should manage the tendency to start much faster than you can sustain as a running pace. You can experiment with running different paces and different perceived effort rates to better understand your own body and stride. Later in our program we’ll introduce the ideas of having you train with speed work and hills. For hills we generally run more slowly and for speed work we seek to sustain a sharper pace over a given range/distance to boost cardiac and respiratory function. Tuning into your PE (perceived effort) and comparing that to a stopwatch and or a heart monitor is the fastest way to develop this skill. How many of us can tell how fast the car is moving without looking at the speedometer? You will develop this as a runner over time, the ability to sense how fast you are moving by how much effort you are putting out.

Lung capacity – The body will develop the ability to process more oxygen to your muscles and feed them faster. This happens in both the short and long term. While many folks say that they breathe easier and more effectively in just 4 weeks it has been proven that there is not a known limit to how much aerobic fitness you may develop. Stretching your torso and practicing diaphragmatic breathing may further enhance this ability to move air and process oxygen. The muscles of the diaphragm and the intercostals that expand and contract the ribcage must be exercised and stretched for optimum results.
What is VO2 max? How many liters of oxygen you can process in a minute is a measure of how much work your muscles can perform before oxygen deficit. You can and will see gradual and continual increases in this capacity. To increase VO2 max capacity takes a long time and is best accomplished with some of the advance concepts of speed and hill work mentioned earlier (that we save for further on in your program). This has lasting repercussions for your everyday health and levels of concentration.

Lower leg muscles – Gastrocnemius (calf), Anterior Tibialis (front of tibia/shinbone), and Soleus (deep calf) are muscles that we are working a great deal with strength training and preparing them for distance running. You’ll see differences in muscle composition in these areas.

Stride enhancing muscles - muscles such as the hip flexors, lower abdominals, glutes are used to raise the leg for the next step and to stabilize the hips during the stride and keep us upright and aligned while headed down the road. Strength training and running are changing these muscles too and adapting them to running.

Foot strength – Feet grow throughout our life and then get tougher and stronger (and larger) as we use them. Think of the farmer who is 85 and now his body is smaller than his work wear but he has the large muscular hands of a much bigger man. Your feet will become conditioned to running and all of the smaller muscles associated with balance, ankle strength and supporting the foot grow stronger over many months of running. As long as you spend a great deal of time in the shoes and socks you will use, running and walking the conditions you will see, and traveling the distances you will race – your feet will condition themselves for your chosen event all by themselves. You’ll just need to treat them gently and stretch them occasionally – we’ll talk more about feet in a few weeks.

Fast twitch vs. slow twitch muscle fibers – fast twitch fibers run mostly off of sugars and are designed for speed. We are born with a certain number of them and while you can wake up what you have been given, to be employed in speed work – you cannot make any more fast-twitch fibers. Those without an abundance of fast twitch fibers will never be Olympic sprinters. Slow twitch fibers burn fat and fire slowly and steadily to easily resist fatigue – they are largely a predetermined quantity too but fast runners can train their fast twitch cells to burn fat and condition them for endurance.

Dr. Maffetone states that the slow twitch or aerobic fibers are the ones that are most resistant to injury, and associated with supporting the joints and that these fibers “contain a significant proportion of the body’s antioxidant activity,” so developing our capacities here is a great investment.

Capillary bed development – Both Jeff Galloway and Arthur Lydiard talk about the body’s ability to increase circulation to the capillary beds as a result of sustained exercise – having great ramification for both muscle endurance and recovery. When you exercise for long periods your body increases blood production and blood volume increases subtly. The cellular need for perfusion during these long runs forces capillary growth into new and developing muscle tissues. This allows greater transport of Oxygen and CO2 throughout the body and has beneficial lasting effects.
In Arthur Lydiard’s book he discusses a study by Swedish researcher Bengt Saltin which compared seven Swedish runners with students from Kenya’s St. Patrick’s High School – a school which has produced six, world cross country champions, many Olympic athletes and four sub 2:10 marathon runners. The research showed that there was a slight advantage among the Kenyans (over the Swedish athletes) for anaerobic capacity of about 3% and each group had equal ratios of slow twitch and fast twitch muscle fibers. The primary difference that Saltin found was that the Kenyans had more mitochondria per muscle cell and more capillary development in their muscle fibers – nearly twice as many capillaries. Lydiard points to this study and teases out what many coaches, anthropologists and physiologists have said since. That these kids run to school every day, and everywhere they care to go, not at a fast pace but in an aerobic way – often for 100’s of miles a year. Without creating an oxygen deficit and without stressful training programs they simply ambulate naturally so many more miles than other folks that when it does come time to train for competition - their bodies have developed great vascular depth and energy generating capacity due to adaptations any runner might produce.

Mental stamina - while the endorphins come from the brain and are often associated with the “runner’s high” sensation this is only one component of mental process in the runner. Many folks may claim to never see the runner’s high phenomena and yet they reference the seasoned knowledge that all runs have high and low points. They have a large “aches and pains database” that they can reference to understand what will pass and what is something that will cancel their run. They use mental tricks, disassociate from low intensity pain, and compare their current toil to previous challenges. The longer a person runs the more tools that have to motivate themselves further and the higher their tolerance becomes to high intensity exercise. Please do not misunderstand here that - I continue to stress that when it hurts, smile, and if it hurts too much to smile, slow down or stop. Yet over time you do get to know that “hurts so good” feeling and that type of achievement translates well to the rest of your life also. We’ll have an entire class in mental process in later weeks.

Changes in metabolism – While running should never be used as a diet program - over the long term you will see body mass changes and BMI will be smaller. You burn a large number of calories over the course a week’s running and often this will cause your base metabolic rate to rise. Muscle mass consumes more calories at rest than fat cells do and thus as you develop lower leg and stride enhancing muscle mass you also shift that resting metabolic rate. Running requires 1.7ml of oxygen per meter for every kilogram of body weight. So for example; a man weighing 160lbs (72.5kg) would use 123cc of oxygen for every 3.28 feet he travels. A 120lb woman will only use 92.5cc of oxygen over the same distance – almost a 25% increase in efficiency. When running you start the run on simple sugars (glucose & then glycogen) but as soon as you have begun a regular aerobic rate for running the body begins to synthesize fats and carbohydrates together for muscle fuel. Galloway’s book cites that after 30 minutes of running the body is using fuel that is comprised of more than 50% free fats (free fatty acids and triglycerides). Along with your light strength training routine this aerobic training will leave you with greater definition and changes that most folks see as a positive benefit of an activity they really enjoy.

How long can I expect to develop these adaptations and how long can I keep these adaptations?

Lydiard commented that he continued to see cardiac and respiratory function increase in athletes for years and felt that the greatest gains were often seen in the third year of consistent training. I mention this to emphasize that while you will experience great gains early in your program – you are just getting started on you potential as a runner. Other coaches have taken this gradual progress even further – Joe Vigil coaches Dena Kastor, one of America’s fastest women in history. Vigil worked with Dena over the course of nearly six years and they increased her lung capacity from 72 mls to a VO2 MAX of 81.3 mls, one of the highest ever recorded in an American athlete.

In the book Born to Run, author Christopher McDougall cites analysis done by Dr. Dennis Bramble, a professor of evolutionary biology at the University of Utah. Dr. Bramble examined finishing times by age division for 2004 New York marathon participants. He found that runners begin to peak after 19 years of age and reach full physical potential at 27 years of age but take heart – yes, they do begin to decline in capacity after age 27 but how long does it take for them to reach the same level of ability that they had at age 19? Sixty-four years of age. Go ahead and read that again slowly because the spell checker is on, I said you would have to be age sixty-four, before a nineteen year old could beat you – provided you were both still training. The statistics on master’s athletes and ultra running confirms this idea and dispels the previous notion that runners only improve for seven years. They may enjoy great capacity and be able to run well for much longer than we previously thought possible. The Tarahumara Indians of Mexico and the Kenyans and Kalahari people run their entire lives, existing without grocery stores ( you have to run for food) and without other means of transport.

Galloway states that muscles can perform the amount of work that they have been accustomed to during the previous 14 days. There is very little loss of adaptations over the short term. If your running is a regular habit you should be able to handle intervals of rest and inactivity without detriment. Loss of some of these running specific attributes occurs slowing over a curve of time. When you are getting back to your program after a long lapse expect to have a short dip in running comfort followed by you feeling more yourself. Folks that have a regular mileage program find that they can sharpen their speed and endurance for a particular race in just 5-8 weeks depending on their physical state. Most runners plan to take a break from running one or two times a year to stay fresh and let the body rest & see no adverse affects from doing so.

What can I do to add depth to these running specific attributes?
We'll continue to talk about this in coming weeks but for now here is some food for thought.

Vary your route by distance, by elevation gain and loss, by surface, by purpose. These all can test and challenge your adaptations and thus enhance your adaptations. Design a four week session for any one attribute and develop it in this mini training period. This tactic called periodization, is a regular technique for elite athletes. They pick apart the challenges of their particular race and design a 4 week interval where they develop the needed skills for that challenge. These periods of specific training can follow each other consecutively without substantial loss of ability and allows them to have a manageable training load while sharpening for a particular event.

Add drills that support balance, movement in a different plane, and activate different muscle fibers.

Sports or activities that translate well to running and enhancing your current adaptations: Tai Chi, Yoga, dance, weight training, rowing, Pilates, plyometric exercise and drills, wobble or rocker boards.

Run year round – these skills develop over time and cannot be rushed without facing injury. So apply patience and mileage while keeping in mind that runners see the biggest gains in the third year or more and that many improve over the course of the their lives.

Run with someone. A little competitiveness, watching someone else’s strengths, having external inspiration to push, can all aid in getting to new and higher places with your running.

Barefooting or de-structuring your shoe program is another way to mix it up and we’ll talk about this in greater detail in another class. In the meantime I’ll just tell you that we start not by running but by walking around the house barefoot. This is advanced territory and merits further investigation and discussion before giving it a try.

Barefooting – what and why?

This installment comes with a handout you can pick up at the YMCA desk until Oct 1st...

While the book Born To Run and the recently published research of Dr. Dan Leiberman seems to have energized the term barefooting and made it into almost a household word – running barefoot did not start in 2009 or even in this century. While I would encourage you to read the work of both of these guys – I’ll take a minute to point out some highlights of how we got to running shoes in the 20th century. I hope to also spark a bit of thought about what things looked like before shoes and how that factors into where we are at today. I will refer you to a great article in Ultrarunning magazine as well, which is a great summary of why you should or should not dump the nice running shoes I asked you to buy in the first place. I kept my shoes but I think that every runner should look at the history of our sport and can take a lesson from what shoeless or minimal shoes can do for your running.

26 bones, 33 joints, 12 tendons, 18 muscles; each foot is an amazing piece of machinery and while it has many things it does not have others – so why it is made this way and what was it for in the first place?

Science has made a great case for a theory that the current form of humans evolved and succeeded as a species due to 26 different, running specific, adaptations. These adaptations allowed us to pursue quarry on the move, at a rate just fast enough to tire that animal out, while we have the innate endurance to finish the hunt and gain groceries. Again, Dr. Dan Leiberman offers a much more through explanation of this theory and it is solidly based in the science of biology and comparative biology. We were able to travel, pretty fast, and fast enough to win food and cross great distances. Clearly, we did this without shoes and anthropologists have not found any evidence of Nikes from this critical time period.

Until Bill Bowerman, the famous University of Oregon track coach, created the running shoe in America in 1972, just 38 years ago, we all ran in very thin light shoes that offered little in the way of a heel cushion or padding from the ground. I have read that he designed the shoe to accommodate what he felt would be a longer and more competitive stride for his athletes. He could teach them to lead with the heel and the longer stride length would out run the competition.

Currently in Africa and many parts of the developing world, children are raised without transportation and also without footwear. It is estimated that the average Kenyan child has about 1,800 miles on their legs and feet by the time they graduate from primary school and all of these miles, for the majority of kids, are without shoes of any kind. It has been argued that this contributes to the number of victories for great Kenyan runners at the international level and on the Olympic podium. Early leg development and natural foot strength (at altitude, Kenya is a mountainous region with an altitude similar to Flagstaff, AZ) allow these kids to develop all the capabilities of their legs before serious training ever begins for competition.

Many cultures are able to train and run well without shoes or with minimal shoes. The Tarahumara Indians of Mexico are featured in Born To Run for their great ability and running in very simple sandals – a slab of rubber strapped to their feet for protection from sharp objects. This is a similar style of shoe to many early Nations of the American Southwest and the pre Spanish cultures in South America such as the Maya and Inca who had thousands of miles of roads and very little in the way of shoes to traverse them. In those days a severe running injury would cause you to drop lower on the food chain – a deadly prospect. So it might be safe (or humorous) to assume that if running injuries did occur in Inca runners – these runners did not pass on the genes for any fragile lower legs and knees.

According to Christopher McDougall’s book Born to Run, Alan Webb’s feet where flat and three sizes larger when he started working with his high school coach to become America’s new top miler. In 2007 Alan set the world’s best 1,500 meter time and broke Jim Ryun’s American record for the mile. But his quest began with flat, weak, de-conditioned feet that were in need of rebuilding. McDougall writes about an interview with Alan Webb on page 175 of his book and Webb says “ I had injury problems early on, … so we did foot strengthening drills and special walks in bare feet” McDougall writes that Alan’s feet changed and his arches became higher as muscles strengthened – his shoe size decreased and his injuries abated.

McDougall writes of an Irish Ph.D, Gerard Hartman who is considered an expert in physical therapy and works with professional runners from around the globe to improve their running. He has been a proponent of barefoot running for many years and cites that “the deconditioned musculature of the foot is the greatest issue leading to running injury, and we’ve allowed our feet to become badly deconditioned over the past twenty-five years”. Many folks have advocated that slowly and gently strengthening our feet over time will allow us to run better and with less injury. We may even find that we can run in lighter footwear. Lighter footwear means less effort and perhaps faster or the sensation of faster as the weight on the end of your leg from a heavy shoe creates a pendulum that takes effort to keep moving.

What do shoes do for me? While all seem to agree that having a sole cover your tender skin provides some protection – many experts are currently reexamining what shoes do well and do not do so well. The good news about this controversy is that in the past 38 years, very little substantive research has been done on how shoes truly affect feet and that is beginning to change now. The United States Military is greatly invested in physical conditioning of its personnel and in the past has seen very high rates of injury in basic training and its share of running related injuries. A recent study on determining the appropriate footwear has shown that the type of running shoe had no correlation on injury prevention for the military personnel in the study. This leads us to “well what can I use to control the movement of my foot, for the least chance of injury?” Your gait, how your foot hits the ground and your running technique becomes more important than the type of running shoe that you might wear according to this study. Manufacturers have succeeded in creating footwear that controls movements of the foot and offers important padding from the ground as you begin running. However, seeking to control the movement of the foot by using a shoe will not be successful in the long run according to new studies. Technique will carry the day and great technique; sensitive feet that are aware of what they hit (and strong feet) may lead to using a much lighter shoe down the road.

In the current day there is an entire tribe of folks dedicated to running entirely without shoes. They have run marathons, ultra marathons and farther in bare feet, and carry flip-flops with them to get into Wal-Mart or a restaurant. You can read their websites and their ideas about what shoes do and do not do for the wearer and how they feel more free with naked feet.
These “barefoot guys” read a bit like they are off the deep end – “foot yogi-mysticism” or something. However, take a good look at the number of people from the medical community that advocate the sale of moccasins to children and preach “barefoot is best” for toddlers. The reason for this, they advocate, is that kids walk sooner when they learn to interpret the ground with their feet (proprioception) and build foot strength naturally. They do not want kids to cut their feet and thus sell a light flexible protective moc- type shoe to achieve this. Many parents have subscribed to this idea with the pediatricians blessing and I’ve seen it work for my own kids. (As I was buying lots of shoes for my running, at $80/pair…)

Arthur Lydiard was a cobbler and made shoes before he was a coach. A coach who was very focused on the success of his athletes. He had his runners in the most basic of footwear and preached against anything “more” for his entire career, which extended well into the era of modern shoes. Internationally sought after coach and physician, Dr. Phil Maffetone was suggesting more than a decade ago that minimal footwear was preferable for similar reasons.

Even Stanford University’s world class track and cross country coach (the program gets Nike’s for free) has had his athletes running barefoot in the grass, two afternoons a week, for decades. He said to Nike that his guys got hurt less when they subscribed to this method. (This is what drove Nike to work with Dr. Gerard Hartman to create the Nike Free.) Long before the birth of the very popular Vibram Five Fingers shoe – many companies across the country have made a living manufacturing simple moccasins and unstructured footwear that allow the foot to move and muscles to work. Inuit people, north of the Arctic Circle knew that this is what kept their feet warm in winter – that the boot would flex and allow better circulation.

While this is all good for some; I am most concerned with my runners being injury free, using the best technique and enjoying their running forever. Many will need something on their feet, at least in winter, to do this and barefooting may be something to try and work into their training program along with foot strengthening and conditioning.

Simply walking around without shoes at home is a good place to start and walking farther progressively is another. You may choose to try the new Vibram Five Fingers Shoes as well, which offer that slight amount of protection for your tender skin and not much else for padding. I have started using theses on very short runs (by time) and adding minutes each week very slowly. I spent a year reworking my stride before I ran with these shoes so that I am not landing on my heel much at all but using the mid-foot and most of my foot to absorb the impact of each step. Further you can practice this technique while walking – you need not run in order to learn how to walk more gently and with a light step.

So this year’s Outdoor Retailer Trade show saw scores of outdoor footwear manufacturers gunning for a piece of the barefoot pie, gearing up to make “thneeds”, or feather weight running shoes for everyone who wants to run barefoot. Get ready to see dozens of these models in the marketplace next year – like Crocs a few years ago, but sillier looking. You may choose to try them or go barefoot, grab some moccasins, run in cheaper “race flats” or just try your old Chuck Taylor’s like Lydiard ran in for decades. But think about a deliberate program of gentle foot strengthening for yourself as a possible next step in your program and add it gradually, just like you started running. Feet that “know the ground” and are sensitive, are less likely to sprain an ankle, will run trails better and may run slower at first but that is OK, you’re in shape and will not “detrain” as a part of this process. Your lower legs will continue to develop in a way that may reduce your injuries over time and your stride will adapt to something that is more powerful in the long run. That is what I want for your running – long running for the long run. So run gently out there.

Read an article about shoeless study here
The NIH article on the Army study here
Danny Dryers list of preferred light weight shoes

Interesting article on shoes from a rehab perspective