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Muscle hypertrophy is the process of increasing muscle size, typically through weightlifting and resistance training. It is a common goal for many regular exercisers, from bodybuilders to athletes and fighters. The process involves mechanical tension, muscle damage, and metabolic stress, which lead to muscle growth. To achieve hypertrophy, it is important to understand the science behind it and consider factors such as genetics, training, and diet. Training plans can vary depending on individual goals and responses, but generally, hypertrophy training focuses on lifting heavier loads for a smaller number of reps and sets. This style of training can also provide health benefits such as reducing the risk of cardiovascular disease and improving metabolic function.
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What You'll Learn
Resistance training
To effectively train for hypertrophy, it is important to understand the underlying science. Three key factors are required to promote hypertrophy: mechanical tension, muscle damage, and metabolic stress. Mechanical tension occurs when muscles produce force to overcome resistance, which is considered essential to muscle growth. This can be achieved by lifting heavy weights, causing structural damage to the muscles. This, in turn, stimulates a repair response in the body, leading to an increase in muscle size.
Additionally, muscle fibres increase in size to accommodate a greater number of myofibrils, which are contractile proteins actin and myosin. These proteins are overloaded during resistance training, and with proper recovery and dietary intake, they expand and enlarge, leading to an increase in the number of myofibrils within a muscle fibre.
To optimize resistance training for hypertrophy, it is recommended to perform multiple sets of 6-12 repetitions with short rest intervals of 60-90 seconds. The intensity of effort should be moderate, ranging from 60-80% 1RM, with subsequent increases in training volume. It is also beneficial to vary exercises to target different muscle groups and prevent plateaus in your progress.
Furthermore, proper body positioning and alignment are crucial to ensure the effectiveness and safety of the exercises. The National Strength and Conditioning Association (NSCA) provides detailed guidelines and instructions in their Exercise Technique Manual for Resistance Training. Following these guidelines will help ensure the exercises are biomechanically efficient and safe for the target muscles.
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Mechanical tension and metabolic stress
Mechanical tension is created when muscles produce force to overcome resistance. During a drop set, for example, you start with a heavy weight that creates high mechanical tension in the muscle. As you reduce the weight and continue the set, you maintain a level of mechanical tension in the muscle, even as fatigue sets in. This prolonged tension can stimulate the muscle growth process.
Metabolic stress is another critical mechanism to achieve hypertrophy, or skeletal muscle enlargement. It is induced by heavy loads, high reps, and short rests. It is believed that the accumulation of metabolites increases muscle activation in a larger proportion of muscle fibres, increasing the amount of mechanotransduction or "outside-in" stimulus. Recent research has shown that higher-volume resistance training causes hypertrophy in the sarcoplasm, not the contractile components (myofibrils).
To promote hypertrophy development, it is important to consider genetics, training, and diet. A positive energy balance (consuming more calories than you expend) is optimal for hypertrophy when combined with resistance training. Protein is the most important macronutrient for hypertrophy development, and muscle protein synthesis must exceed muscle protein breakdown.
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Stimulus to Fatigue Ratio (SFR)
The Stimulus to Fatigue Ratio (SFR) is a concept in muscle training that refers to the stimulative effect of an exercise that drives adaptations (such as muscle growth and strength gain) compared to the fatigue it generates. In other words, it is the idea that a high stimulus with low fatigue is ideal for optimising training progress while minimising the risk of recovery issues.
Fatigue is the physical stress that the body is placed under during exercise, and from which it must recover to see positive results. For example, a person doing a highly stimulative push workout will generate local fatigue in the muscles they are training, such as the chest, shoulders, and triceps, as well as general fatigue that affects other parts of the body and the central nervous system. As the body recovers from this fatigue, it adapts to the specific demand to better handle it in the future. This is what leads to the development of cardiovascular endurance, strength, and explosiveness, and ultimately, muscle gain.
However, it is important to note that fatigue is part of stimulus, and the two are not mutually exclusive. It is impossible to have a stimulative workout without also generating fatigue. Therefore, it is necessary to manage this fatigue to get results. This is where the SFR comes in—by paying attention to the SFR, coaches and trainees can build more efficient workout plans that provide the same stimulus and drive the same progress without generating as much fatigue. For example, if you train in a way that generates more stimulus and less fatigue, you can do more of it, getting better results.
There are three crucial components of an exercise that create a stimulus for growth: range of motion, muscle tension, and muscle groups activated. In addition, three factors are needed to promote hypertrophy: mechanical tension, muscle damage, and metabolic stress. Mechanical tension is when muscles produce force to overcome resistance and is considered essential to muscle growth.
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Rest and recovery
To maximise muscle recovery, it is important to eat healthy foods and get a good night's sleep. Research has shown that sleep deprivation may impair muscle recovery by hindering the body's inflammation response and the production of hormones that aid muscle growth. It is also important to ensure proper hydration and nutrition, with a focus on consuming enough protein to support muscle repair and growth.
In addition to sleep, hydration, and nutrition, active recovery can aid in muscle recovery. Active recovery involves light physical activity that increases blood circulation, helping to remove waste products from soft tissues and delivering nutrients to support muscle repair and growth. Examples of active recovery exercises include walking, swimming, cycling, and light weightlifting.
The amount of rest time between sets during hypertrophy training can vary depending on individual needs and the type of workout. Experts recommend rest times between 30 seconds to 2 minutes for hypertrophy training to maximise muscle growth. For compound exercises, longer rest periods of 2-3 minutes may be beneficial, while isolation exercises may require shorter rest periods of 1-2 minutes. It is important to listen to your body and adjust rest times accordingly to ensure adequate recovery.
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Genetics and diet
Genetics
Myostatin-related muscle hypertrophy is a rare condition characterised by reduced body fat and increased muscle size. Individuals with this condition have up to twice the usual amount of muscle mass and tend to have increased muscle strength. This condition is caused by variants in the MSTN gene, which provides instructions for making a protein called myostatin. Myostatin limits muscle growth, ensuring that muscles do not grow too large. People with a variant in both copies of the MSTN gene in each cell (homozygotes) have significantly increased muscle mass and strength. Those with a variant in one copy of the MSTN gene in each cell (heterozygotes) also have increased muscle bulk, but to a lesser degree.
Diet
To achieve hypertrophy, a positive energy balance is optimal, which means consuming more calories than you are expending. Protein is the most important macronutrient for hypertrophy development, as muscle protein synthesis must exceed muscle protein breakdown. It is recommended to consume 1.7 to 2 g of protein per kilogram of body weight per day. For example, a person weighing 70 kg should consume between 119 to 140 g of protein per day. Animal products are usually a great source of protein, especially lean meats like chicken and turkey, which are low in fat and packed with amino acids to support muscle growth and recovery. Whey protein is another popular source of protein, as it is quickly absorbed by the body and contains a significant amount of BCAAs, which help with muscle recovery.
In addition to protein, a general carbohydrate intake of at least 3 g per kilogram of body weight is recommended to maximise training performance. Carbohydrates provide energy and influence muscle growth, as hormones such as insulin are produced in response to nutrients like glucose. Whole grains, such as brown rice and bread, are good sources of carbohydrates and fibre.
It is also important to consume healthy fats, as they play an important role in muscle building. Oily fish like tuna and salmon are high in protein and contain omega-3 fatty acids, making them a good choice for a balanced diet. Peanuts are another source of protein, fat, and carbs, and they can be a good way to get extra calories and nutrients.
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Frequently asked questions
Muscle hypertrophy is the process of increasing muscle size, typically through weightlifting and resistance training.
When you lift heavy loads, your muscles tear and the body experiences metabolic stress. In response, the body tells the proteins to increase, and the muscles slowly grow. To keep growing your muscles, you need to increase the volume of weightlifting over time.
There are two types of muscle hypertrophy: myofibrillar hypertrophy and sarcoplasmic hypertrophy. Myofibrillar hypertrophy lets you lift more weight for a single repetition, improving your 1-rep max. Sarcoplasmic hypertrophy lets you lift weights for more repetitions, improving your rep maxes.
Some trainers recommend three days a week, while others say five. There is no exact answer, as it depends on where you are starting.
Compound exercises are best for muscle hypertrophy as they train several major muscle groups at the same time. Examples include squats, deadlifts, bench presses, and overhead presses.
