Fat Loss – Body Transformation – Advanced Nutrition

Here’s one of my more in-depth pieces that I’ve written in a very long while that I think will benefit everyone that is remotely interested in training and working out, male or female, novice to expert.

The number of repetitions performed for a specific goal is one of the most confusing topics for most novice exercisers for a few reasons. The myth that higher reps help define a muscle or sculpt a certain body part that is regularly perpetuated by uneducated personal trainers and other sources of misinformation is a large reason for this. I’ve discussed this hundreds of times here on the blog, but to reiterate, “sculpting”, “toning”, and/or “defining” are simply the product of lowering body fat levels. No movement, weight training or otherwise, spot reduces fat from a certain area, no matter how many reps you may do of the exercise. Body fat must be removed from the entire body and without surgery (liposuction), one cannot control where the fat is lost from (crunches and Ab Ripper X do not sculpt the midsection).

In this writing, I’m going to discuss some general guidelines on rep ranges, the pathways of energy (what fuel is being used during a specific rep range) and a few exceptions to help you determine what rep range you should be training in for your specific goals. Hopefully, it will help you better understand why you perform a certain range of repetitions and maybe debunk a few myths about “getting large and bulky by lifting heavy weights” and a certain rep range being used for “sculpting and toning”.

First, it’s important to understand that simply performing a certain rep range means nothing if the load that is being used is not adequate. For example, if I refer to the 10-12 rep range, I am implying that the last 1-2 reps are near or at maximum effort. Sorry, but training is a lot more than just going through the motions.

Below are a list of goals obtained from weight training. As you will see, toning or defining a muscle is not listed. The best way to lose fat? Increase the resting metabolic rate by intense weight training and increasing lean body mass. The actual increase of muscle is a very slow process, and most people have a very low capacity for muscle growth. Read: women, you will not get big and bulky.

So what is the deal? One personal trainer says anything over 8 reps is a waste of time. The next Beach Body fad (okay, that’s a joke, so P90Xers, please don’t waste the time to send me a message unless you just want to chat :D) is 100+ rep sets. Is the holy grail of training somewhere in between? Does it matter which exercises are used for specific rep ranges?

Before I move on to specific rep schemes, I want to cover two important topics that will help you further understand the body’s response to training. Over the last 15 years, I’ve written about Energy Metabolism and the Pathways of Energy numerous times, and with good reason: understanding these principles make it easier to understand how to reach specific training objectives.

But I need to preface THOSE TWO sections with one simple question.

What is ATP?

-Without getting overly technical here and boring the everliving piss out of you, ATP is simply the molecule that stores energy in a form that can be used for muscle contractions. Energy from the body revolves around using the current ATP stores and rebuilding those stores quickly for more workload. Every human movement requires ATP. Unfortunately, the muscles are limited in how much ATP they can hold. Larger muscles are stronger muscles. Why? Because they hold more ATP!

ATP Production/Pathways of Energy
ATP/CP Energy Pathway:
-This pathway is anaerobic, meaning it requires no oxygen for energy use. Think explosive movements (one all out rep, tearing a car door off or lifting it off of someone in a panic – it happens).

Glycolytic Pathway:
-This pathway is also anaerobic. Once you’ve depleted all stored ATP, the body must breakdown carbohydrates to produce more ATP (glycolytic – think, glycogen, glucose, etc). Glycogen is stored in the muscle cells and glucose is found in the blood. See the importance of carbohydrates BEFORE training?

How effective your muscles function in this pathway is determined by several factors:
-How quickly can you get rid of lactic acid (get rid of the burn, get back to work) – increased workload leads to overload of the muscles which is stimulus for change.
-How well you can tolerate lactic acid build up. I’ve had numerous novice clients that completely lock up at the first sight, while more experienced exercisers can push through it.
-How far can you push it before the pain makes you say “to hell with this”.

Oxidative Pathway:
This is the aerobic pathway. It’s tough to understand this for some, but this is the pathway which most ATP is actually produced – it just takes much longer (which is why one cannot all out sprint for 5 minutes).

Obviously, you’re doing a bit more to build lean body mass in the other two pathways, which explains why marathoners and distance athletes typically aren’t muscular (please, don’t confuse “skinny” for “lean”. There’s a big difference). But here’s something that causes a ton of confusion: this is the only pathway in which fat can be used directly for energy. This is why many people believe that they’ll get rid of fat faster by doing cardio, and during the exercise, more carbohydrates are used as intensity as increased. When carbs become depleted at high intensity cardio? The body will tap into muscle for protein (the aminos leucine, isoleucine and valine). The effect? Lost lean body mass, slowed metabolism, less definition.

Don’t be confused: even with extreme volume lower intensity cardio, fat loss is still greatly limited, and the body has a very small window before it will look to breakdown muscle mass for energy.

Energy Metabolism
Physical activities can be based into four groups based on the energy systems (below) that are used to support these activities.

1. Strength/Power
-Energy coming from immediate ATP stores. All out, one rep effort that lasts typically no more than 3 seconds.

2. Sustained Power
-Energy coming from both ATP and available Creatine Phosphate (CP) stores. Near all out effort from 0-10 seconds.

3. Anaerobic Power-Endurance
-Energy from ATP, CP, and lactic acid. 400 meter sprint, 50 rep leg press, 100 yard swim sprint, lasts 1-2 minutes.

4. Aerobic-Endurance:
-Energy from the oxidative pathway, typically any event that lasts over 2 minutes in duration.

With this being explained, is it anymore clearer as to why I refer to P90X and circuit training as cardio based programs with minimal effect on body transformation (you’re spending most of the time in the oxidative threshold, never allowing ATP/CP stores to reload).

And without further adieu – which rep ranges are appropriate for your goals?
Training Goals/Appropriate Rep Schemes
It’s important to understand how muscle fibers are recruited – the body will attempt to use the smallest fibers when it can (slow, then intermediate, then fast twitch fibers).

Goal: Strength/Power – 1-5 reps
Optimal rep range for strength and power are lower reps, usually somewhere in the 1-5 range. As the reps increase, the capability of the load to increase strength and power begins diminishing.

Heavier weight means more muscle fibers recruited and strengthened, enabling us to place a higher degree of overload in other rep ranges, leading to greater muscle development.

Exercises that greatly benefit from training in overall strength and power rep range: compound exercises such as squat, bench press, dead lift. Due to injury risk, it is not optimal to work in this rep range on most isolation and single joint exercises.

Regardless of your overall training goal(s), a foundation of strength and power will transfer well across the spectrum in all rep ranges and training objectives.

Goal: Overall Muscular Hypertrophy (growth) 6-12 reps
The moderate rep range of 6-12 reps is probably the most commonly used rep range and for good reason, as it has many of the benefits of the higher and lower rep ranges. This rep range combines the capabilities of moderately heavy weight to increase intensity, while also allowing the individual to perform a set that lasts long enough to allow the muscle to remain under tension (and cause that lactic acid burn that so many people enjoy).

Exercises that will benefit you most during the muscular hypertrophy rep range: you’re pretty safe here with compound and most isolation exercises, but consider joint structure, tendon and ligament strength and stabilizer issues before going overly heavy with some movements (and by heavy, I mean lower reps vs higher reps).

Goal: Anaerobic Strength Endurance 12-20 reps & Aerobic Strength Endurance 20+ reps

I’ve decided to combine these two goals into one, although they’re very specific. For most guys, they’re reading this thinking “Well, I really don’t have a need to do anything over 12-15 reps, right? WRONG. These rep schemes cause massive glycogen depletion. Why do you care about that? The body compensates by forcing the muscle to hold more glycogen (the main source of fuel for muscle contraction), making the muscle become more efficient. Glycogen also buffers lactic acid – meaning you can do more before the burn becomes so severe that you have to stop.

As far as exercises, you’re safe with any group. Obviously, higher rep compound exercises are a bit more difficult (think 25 rep squats) than isolation work. You can also group cardio based work into this threshold as well.

Putting This Information To Use In Developing Your Workout
Should you be training in one rep range? I think a better question is “why limit yourself”? While I prefer to warm up with lighter weight, due to fiber recruitment and the energy pathways, it makes more sense to perform your heavy work early in your workout before transitioning to single joint/higher rep work. But don’t be afraid to experiment: I often perform 20-50 rep leg presses, 25 rep squats, 20 rep bench presses and other rep schemes to keep things fresh and offer different types of stimulus. Don’t “marry” one rep range. Your specific goals are important, but injury history and risk aside, I’ve given plenty justification to train using every rep range.

Need clarification? Feel free to leave questions or comments below!

Boyd Myers
Personal Trainer in San Antonio
Owner, San Antonio’s Top Personal Training Studio
16613 Huebner Rd (corner of Huebner and Bitters)
210.391.1454