3 Key Requirements Needed for Muscle Growth to Occur

There are three key requirements needed for muscle growth to occur. To ensure muscles grow, known as hypertrophy, you need an appropriate training stimulus. In addition, proper diet with adequate protein is a must and of course plenty of sleep. A fourth factor, not discussed here, is the important role played by genetics.

Conversely, there are some people who train hard, eat well and get plenty of sleep. They typically get stronger, but don’t really pack on lean muscle mass. One or a few few variables could be the culprit. It may be there age, gender, hormonal influences or possibly genetics. There is a saying about the role played by genetics: “If you want an Olympic athlete then you need Olympic parents.”

Training Stimulus for Muscle Growth

How do you stimulate muscle growth? When muscles are challenged, they adapt and change over time. Changes are dependent on the type of activity and types of muscle fibers used, the external load placed on the muscle, and the velocity and duration of the contraction (Marieb, 2004). The point is to push through all your workouts, especially a heavy day. Because muscular growth or hypertrophy can only be accomplished through these adaptations and changes. “It takes about 16 workouts to have a noticeable ‘superficial’ effect. There is simply no other recipe to do this in a healthy, orderly, and long-lasting manner.” Try using the Jefit, a workout planner & tracker app to record all your workouts.

Is the Current RDA for Protein Adequate?

This is a tough area for a lot of people. Their eating habits are just not where they need to be. In addition to eating well-balanced, highly nutritious meals, protein intake needs to be sufficient. If not, muscle growth to say the least, will be difficult if not impossible. The scientific research has shown different results over the years in terms of protein needs.

The question we should ask ourselves is – should we follow the suggested RDA of 0.8 grams/kg/day for protein intake or is it more in line with 1-2 gram/kg/day? The answer may depend partly on the volume of daily exercise you’re doing, if you’re a strength or an endurance athlete, and your age.

Nutritional Intake (Especially Protein)

A classic study was done in 1988 at the USDA Human Nutrition Research Center on Aging at Tufts University in Boston. I was actually one of the younger test subjects in that particular study. The team headed by Meredith and colleagues, looked at the protein needs of 12 subjects. Six were young (26.8 +/- 1.2 yr) and six were middle-aged (52.0 +/- 1.9 yr) endurance-trained men. All subjects consumed either 0.6, 0.9, or 1.2 grams/kg/day of high-quality protein over three separate 10-day periods. They did this while maintaining their training and a constant body weight. The results of the study estimated that protein requirement was 0.94 +/- 0.05 grams/kg/day for the 12 men. The data from the study showed endurance exercise was associated with a specific dietary protein requirement. These needs were actually greater than the current recommended dietary allowance of 0.8 g/kg/day.

Since then, there have been several studies on individuals who engaged in regular aerobic exercise. The exercise, more vigorous in nature, demonstrated a higher protein need more in line with 1.1 to 1.4 grams/kg/day. This by the way is about 38-75 percent above the current RDA range. There is good evidence that the current recommended protein intake may actually limit muscle growth. This was seen in a study published in the Journal Applied Physiology. Some research groups report an optimal intake more in line with a protein range of 1.5 to 1.8 grams/kg/day which is 88 to 125 percent above the suggested RDA. The best way to make this happen is by ingesting 25-30 grams/protein with each meal and of course supplement with a post recovery protein drink.

Optimal Recovery (Sleep)

You can have the other two boxes checked, but if adequate sleep is not happening, muscle growth will not occur. For those individuals training extremely hard, periodic naps may also be needed. As training intensity increases, more recovery and sleep is needed. According to the National Sleep Foundation (NSF), we need 7-9 hours of uninterrupted sleep each night. Are you getting that? When this happens on a regular basis for you, you can check that third box. Here are their guidelines for recommended amounts of sleep by the NSF.

Teenagers (14-17): Sleep range widened by one hour, compared to younger children, to 8-10 hours.
Younger adults (18-25): Sleep range is 7-9 hours (new age category).
Adults (26-64): Sleep range did not change and remains 7-9 hours.
Older adults (65+): Sleep range is 7-8 hours (new age category).

Key Take Aways

Increasing strength and building muscle can often seem like a full-time job. You will need all the help you can get to make this happen, especially on the fronts discussed here. By checking all three boxes (training/nutrition/sleep), your odds of finally adding lean muscle will improve greatly. Be well and stay Strong!

References

Meredith, C.N., et al., (1989). Dietary protein requirements and body protein metabolism in endurance-trained men. J. Applied Physiol. 66(6): 2850-2856.

Tarnopolsky, M.A., et al., (1992). Evaluation of protein requirements for trained strength athletes.J. Applied Physiol. 73(5): 1986-1995.

Stay Strong Together

Jefit, named best strength training app by Sports Illustrated, Esquire, GQ, Men’s Health, Greatest, Forbes Health, and many others. We offer a community responsible for 92,000,000 workouts to date! The app, which recently passed 10 million downloads, comes equipped with a customizable workout planner and training log. The app also has ability to track data, offer audio coaching cues, and can share workouts with friends. Visit our members-only Facebook group. Connect with like-minded people, share tips, and advice to help get closer to reaching your fitness goals. Read the scientific paper published in the Journal of Medical Internet Research using the Jefit app. Also, a great Jefit app review was recently published by MUO that can be found here.

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Michael Wood, CSCS

Michael Wood, CSCS, is a Certified Strength & Conditioning Specialist and Content Manager for JeFit app. Michael is a former Assistant Strength & Conditioning Coach at the University of Connecticut and Exercise Physiologist at the USDA Human Nutrition Research Center on Aging at Tufts University. He is the Founder of Michael Wood Fitness, named twice to "Top 100 Trainers in America" by Men's Journal and voted Best of Boston by Boston Magazine. Michael previously taught at the University of Connecticut and Boston University. He is the author of TBC30: 6 Steps to a Stronger, Healthier You.