Why Cardio Isn't the Devil

Tis the time of year for everybody to renew their promise to be healthier, lose fat, and get in the best shape of their lives. What this really means will depend upon whom you ask. For most people, losing fat is synonymous with improving their health. By far the most popular goal in health and fitness, many trainers can spout 20 ways to help clients burn fat. As a trainer, our job is to provide the most effective, efficient, and healthy way to achieve the goal without harming the client. Studies have shown the diet combined with exercise will result in the greatest fat loss, but nutrition alone far exceeds exercise alone [1]. I’m not the first, and I’m definitely not going to be the last to tell you, nutrition is king, resistance training is essential, and cardio has gone by the wayside for fat loss…but does it still have a place in our training?

Most people starting on a fat loss journey start out the same, with jogging. Why do they start with jogging? Because it’s easy, requires only shoes and a place to jog.

Let’s take Sal as an example. Sal wants to get fit, so Sal does what so many have done before, started eating better and jogging. Sal is losing weight, feeling better, and then the all-knowing internet disparages jogging as not worth the time and convinces Sal to stop jogging and get into the gym and do resistance training and HIIT despite clear indicators that Steady State will benefit Sal. Since everybody wants the biggest return on their investment, Sal jumps ship and joins the HIIT train and continues to make progress; amazing progress with no more mind-numbing cardio.

Despite LISS having been shown to burn significantly more calories than weight training or High Intensity Interval Training during the activity [2], it still gets a bad rap because it takes considerable time when compared to HIIT. Given the data and numerous studies confirming it, HIIT appears to be nominally more effective than LISS for fat loss when looking only at calories burned training times are equalized. In the 24 hours after training, HIIT Training resulted in burning approximately 100 more calories than LISS over the course of the day [3]. Another study showed HIIT resulted in a 10% increase in calories burned in a 24 hour period compared to LISS, despite having the same caloric burn during the activity [4].

Some will use the “efficiency adaptation” argument, that it will take longer to burn the same number of calories after training in a style for a length of time, but they fail to consider the exact same thing happens with strength training or HIIT training. The solution is a simple one, up the intensity or up the volume. If we’re talking running, that means run faster or run further, nullifying the rationale that “it takes longer to burn the same number of calories.” Despite other claims that LISS will slow metabolism, I have only found research that demonstrates lowered metabolic rates DURING exercise which recovers soon after the conclusion of activity [5,6]. Does this mean it isn’t possible? No, it just means I haven’t found any research that demonstrates ONLY LISS will lower metabolism over time.

The problem I have with eliminating LISS is not in the nominal difference in caloric burn between activities, the amount of time, or the boredom, but in the impact on the heart itself. Because the heart is a muscle, it is subject to hypertrophy, just as any other muscle. I may become very unpopular for this, but LISS has its place in fat loss training and definitely in heart health.  Mike Robertson, MS, CSCS, co-owner of IFAST gym in Indianapolis says “One of the biggest misconceptions about HIIT is that it develops the aerobic system and the anaerobic system equally, but aerobic and anaerobic exercise actually place very different demands on your heart and your muscles.” This is where I believe trainers are doing a disservice to their clients by pushing them to avoid LISS altogether. Several studies have shown the positive effects of training on the heart: lower heart rate, decreased blood pressure, improved cholesterol levels, reduced inflammation of the arteries, etc.

There are two common types of hypertrophy in the heart and both occur in the left ventricle. Eccentric hypertrophy, which is the increase of the diameter of the left ventricle resulting in increased volume. The other versions is concentric hypertrophy, which results in increased wall thickness and decreased volume of the left ventricle through the thickening of the walls. In 2002, The Journal of the American College of Cardiology noted the significant increase on the left ventricle mass compared to sedentary individuals [7]. Further, in a study published by the American Heart Association, both endurance trained and strength trained athletes demonstrated increased LV wall thickness, but strength trained only demonstrated the most [8]. In addition, only the endurance trained athlete demonstrated increased LV diameter [8,10]. While the loss of LV volume may not set off alarms, let’s explore the result of lower LV Volume. By having a lower volume, the person is prone to higher blood pressure and higher resting heart rate. By having a thicker wall and lesser diameter, there is greater chance of “skipped beats” as a result of the ventricle not being full when the heart beats [9,10].

Given that most overweight people already have high blood pressure and increased resting heart rate (in excess of 72 bpm) it is risky to remove LISS from their training protocols and prescribe HIIT as a means to lose weight given the likelihood of extreme spikes in blood pressure and heart rate. In general, LISS cardio will effectively improve heart performance and aerobic conditioning better than HIIT or weight training alone while limiting such spikes. Also, while it is very unlikely, there is the possibility of sudden cardiac death caused by having too high of a heart rate in combination with extremely high blood pressure, which is more likely to occur during bouts of HIIT or max effort weight training. Taking an untrained individual, as most beginners are, and removing the gradual process by which they can lower their heart rate and blood pressure while improving aerobic conditioning through steady state cardio is like blocking off everything above third gear and telling someone to drive on the highway. It may work for a while, but eventually, something is going to blow. Even if weight is lost through other methods, the benefit of LISS cardio on the heart cannot be overlooked.

In the era of instant gratification and the greatest return on investment, fitness is not sacred. We are all looking for the “shortcuts” and the fastest way to get fit, but we have to remember, we should be able to stand before we sprint. The long slow road of LISS may be boring and it may not have the best returns on time, but it will safely get you ready to merge on the highway and keep you in shape to stay there.

Sources:

1. Miller, W., Koceja, D., & Hamilton, E. (1997). A meta-analysis of the past 25 years of weight loss research using diet, exercise or diet plus exercise intervention. International Journal of Obesity, 21, 941-947.
2. Trapp, E.G., Boutcher, S.H. Fat loss following 15 weeks of high-intensity, intermittent cycle ergometer training. Obesity Reviews 341, 2006.
3. Treuth, M.S., et al. Effects of exercise intensity on 24-h energy expenditure and substrate oxidation. Medicine & Science in Sports & Exercise 28(9):1,138-1,143, 1996.
4. Meuret, J.R., et al. A comparison of the effects of continuous aerobic, intermittent aerobic, and resistance exercise on resting metabolic rate at 12 and 21 hours post-exercise. Medicine & Science in Sports & Exercise 39(5 suppl):S247, 2007.
5. Sidossis LS, Gastaldelli A, Klein S, Wolfe RR. Regulation of plasma fatty acid oxidation during low- and high-intensity exercise. Am J Physiol. 1997;272:E1065–70.
6. Romijn JA, Coyle EF, Sidossis LS, Zhang XJ, Wolfe RR. Relationship between fatty acid delivery and fatty acid oxidation during strenuous exercise. J Appl Physiol. 1995 Dec;79(6):1939-45.
7. Scharag, Jurgen., et al. Right and left ventricular mass and function in male endurance athletes and untrained individuals determined by magnetic resonance imaging. J American College of Cardiology. 2002 Nov; 40(10).
8. Pluim, B, Zwinderman, A, van der Laarse, A, van der Wall, E., The Athlete’s Heart: A meta-analysis of Cardiac Structure and Function. http://circ.ahajournals.org/content/101/3/336.full
9. Rawlins, J, Bhan, A, Sharma, S., Left Ventricular Hypertrophy in Athletes., European Heart Journal – Cardiovascular Imaging, 2009 Feb; 350-56.
10. Mihl, C, Dassen, W, Kuipers, H., Cardiac Remodeling: concentric versus eccentric hypertrophy in strength and endurance athletes., Netherlands Heart Journal, 2008, Apr; 16(4): 129-33.

Willpower is a Muscle

“I wish I had more willpower.” The sentence heard repeatedly around dessert tables at holiday parties. The same sentence muttered by the “this is the time” guy that wants to kick some bad habits. Let’s not forget the New Year’s Resolutionist, this is going to be the year, fitness chaser that can’t seem to stay on track with their diet or training. But why do we say we don’t have the willpower to overcome these obstacles? Maybe it’s time we actually looked at this mystical thing called willpower, why it fails us, and how we can overcome.

Bear with me for a minute and see if this situation seems familiar.

You enter into health and fitness for some motivational reason: you want to lose weight, the doctor says you need to or you’ll have xyz disease, you want to grow an ass that holds your pants up, you want to be able to run with your kids, etc. Whatever the reason, you entered into this crazy venture and you’re beastmode, going ham, dedicated, and committed to doing it. You got the magazines, the supplements, the training books, and you’re on your way. After a few weeks the progress slows, the enthusiasm dwindles and eventually, you’re finding that “other” things just keep popping up and stopping you from training.

Your friends and family don’t support you and encourage you, and you’re on the verge of quitting. You hear about this website called Fitocracy that supports people on their fitness journey and you join. You get re-energized and you’re back on track with all your props, badges, and duels. Somehow, you still have demons telling you to just quit because the the novelty wore off. You reach out to the community and ask for support, and they give it, some say train with friends, others to get a trainer, and inevitably, somebody will give you the same old line about “get a goal.” [Read about why having goals isn’t enough here] You’re now in a position to make a choice, with community support you lose a few, fail, or succeed, or you can just quit.
**Losing and failing aren’t always bad things. There’s an important difference between losing, failing, and quitting as David Allen points out in his article on EliteFTS**

Bear Bryant said “The first time you quit, it’s hard. The second time, it gets easier. The third time, you don’t even have to think about it. If you’re reading this in disbelief, that’s great that you are one of the lucky ones that hasn’t thought “why am I doing this?” or you’re just delusional. I’m willing to bet my Ben & Jerry’s that you’ve been down this path with something. I know I’ve been there a few times where I was chasing goals and kept falling short but because I didn’t give up, I’ve been able to make it.

Back to willpower. What is willpower? Many would agree it is the “thing” that allows us to make good choices or fails us when we make poor choices. Some believe it’s a force inside of us that allows us to hold on and defeat temptation and others refer to it simply as “self-control.” The APA defines willpower as the “ability to resist short-term temptations in order to meet long-term goals.” I define willpower as the muscle behind habit and the scapegoat behind our failures.

So how do we get better at defeating temptation and continuing the pursuit of our goals? We train our willpower, of course! When we want to conquer physical tasks, we train and use our muscles. When we face intelligence-related tasks, we study and we use our brain. It is the exact same thing when we want to change our lives, only we can’t see or feel the immediate impact of our efforts. We change our lives through building good habits and we build good habits through exercising willpower.

Some studies say 21 days builds a habit, others, 66, and I’m sure if I were to look long enough I’d find 20 other timeframes. The short of it is habits take time and every day until it becomes a habit takes willpower. We’ve all been there, to that place where we’re so tired and so stressed that we just don’t have the energy to fight anymore. While we can’t flip a switch and make ourselves strong enough to resist, we can take three small steps to help us in the battle.

The first step, and probably one of the most obvious and overlooked steps is to minimize the exposure to the trigger that brings out the bad habit and to emphasize the good habit. If the problem is eating junk food, then removing the junk food, avoiding the fast food restaurants, and rearranging the kitchen so healthy foods are easy to access and junk requires more effort is a starting point. If the goal is to work out more, start with 10 minutes and increase in small amounts each day until you reach 45 minutes, and then add a second day, and a third.

The second very important step is finding a balance in your life. Over-indulgence and over-restriction are both tremendously detrimental to willpower and good habits. We read it all the time now with IIFYM and Flexible Dieting. If I am too strict, I am exhausting my willpower at every turn and eventually will run off track and give in before I have trained a new habit. If I’m too loose, I will never change.

Finally, for those times when we just can’t do it on our own, have a support group and an accomplice that truly does have your best interest at heart. Some will turn to family, some to friends, and some to social networks like Fitocracy. In any case, having others there to talk to and offer strength when you feel weak will help you beat those evil temptations and strengthen your willpower. And after enough help and support, that willpower will become a habit and you will be able to focus on your next healthy habit.

To sum up the three keys for stronger willpower

1. Minimize exposure to trigger objects, maximize exposure to healthy triggers
2. Find balance in your life, being too extreme only makes it harder to succeed
3. Have an accomplice to keep you on track, there are support groups for everything

A few years back I saw this posted on a weightroom door and it spoke to me.

The Habit
I am your constant companion.
I am your greatest helper or your heaviest burden.
I will push you onward or drag you down to failure.
I am completely at your command.
Half the things you do, you might just as well turn over to me,
And I will be able to do them quickly and correctly.
I am easily managed; you must merely be firm with me.
Show me exactly how you want something done, and after a few lessons, I will do it automatically.

I am the servant of all great men.
And, alas, of all failures as well.
Those who are great, I have made great.
Those who are failures, I have made failures.
I am not a machine, though I work with all the precision of a machine,
Plus, the intelligence of a man.
You may run me for profit, or run me for ruin; it makes no difference to me.
Take me, train me, be firm with me and I will put the world at your feet.
Be easy with me, and I will destroy you.
Who am I?

I am a HABIT! 

And with everything I write related to health and fitness, BE PATIENT! Nothing happens overnight, and with health and fitness it will take time, so take a deep breath, get out the calendar and celebrate the successes, no matter how small (no, I did not say to eat the cake) because the little celebrations are what keeps us going. 

And if you need some support, join Fitocracy and follow Erin and I (GottaLift and ErinEW6916) or send us an email at zstrengthfit@gmail.com