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The human body has about 600 muscles, which work in pairs based on their functions. These are known as antagonistic muscle pairs, where one muscle contracts to move a body part and the other relaxes or lengthens to return the body part to its original position. For example, when performing a bicep curl, the biceps contract to produce the movement, while the triceps relax to allow the movement to occur. Muscle pairings can also be used to create an efficient strength training routine.
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What You'll Learn
Muscle pairs and movement
The human body has about 600 muscles, and they work in pairs based on their functions. The brain, nerves, and skeletal muscles work together to cause movement, and this is known as the neuromuscular system.
Muscles work in pairs called antagonistic muscle pairs. One muscle of the pair contracts to move a body part, and the other muscle in the pair then contracts to return the body part to its original position. The muscle that is contracting is called the agonist, and the muscle that is relaxing or lengthening is called the antagonist. For example, when you perform a bicep curl, the biceps contract to produce movement, while the triceps relax to allow the movement to occur. The biceps are the agonist, and the triceps are the antagonist.
During the upward phase of a press-up, the triceps contract to extend the elbow, acting as the agonist, while the biceps relax and lengthen as the antagonist. In the downward phase, the biceps contract to control downward movement, acting as the agonist, while the triceps relax and lengthen to allow elbow flexion.
In addition, other muscles called fixators assist by supporting and stabilizing the joint and the rest of the body. Some fixators also assist the agonist and act as synergists. For example, the abdominals can act as fixators to stabilize the body for hip and knee movements.
When exercising, it is important to warm up the muscles first. Stretching increases blood flow to the muscles being worked. Without a proper warm-up, it is possible to damage muscle fibers or pull a tendon.
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Antagonistic muscle pairs
Muscles work in pairs to enable movement. Since muscles can only contract and pull, they cannot push bones back into their original position. Therefore, muscles work in "antagonistic muscle pairs", where one muscle contracts to move a body part, and the other muscle contracts to return the body part to its original position. The muscle that is contracting is called the agonist, and the muscle that is relaxing or lengthening is called the antagonist.
An example of an antagonistic muscle pair is the biceps and triceps. When performing a bicep curl, the biceps contract to produce the movement, making them the agonist. At the same time, the triceps relax to allow the movement to occur, making them the antagonist. During a press-up, the roles reverse. In the downward phase, the triceps contract to control the extension of the elbow, acting as the agonist, while the biceps relax and lengthen, acting as the antagonist. In the upward phase, the biceps contract to flex the elbow, becoming the agonist, and the triceps relax, becoming the antagonist.
Another example of an antagonistic muscle pair is the quadriceps and hamstrings. To extend the leg, the quadriceps femoris contracts, acting as the agonist, while the hamstrings relax and lengthen to aid the movement as the antagonist. When flexing the leg, the hamstrings contract and act as the agonist, while the quadriceps femoris relax and lengthen to act as the antagonist.
In addition to agonists and antagonists, other muscles called fixators assist antagonistic pairs by supporting and stabilising the joint and the rest of the body. For example, the abdominals act as fixators to stabilise the body during hip and knee movements.
When creating a strength training routine, some people find it helpful to pair certain muscle groups together to make their workouts more efficient. This can include performing compound exercises that work several muscle groups at once or isolation exercises that target specific muscles within a muscle group.
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Agonists and antagonists
Muscles work in pairs, with one muscle contracting to move a body part and the other muscle relaxing or lengthening to return the body part to its original position. These are known as antagonistic muscle pairs.
The muscle that contracts is called the agonist, or prime mover, and is the one "in agony" when you are doing a movement as it does the most work. For example, when you perform a bicep curl, the biceps contract to produce the movement and are therefore the agonist. Meanwhile, the triceps relax to allow the movement to occur and are thus the antagonist.
The agonist and antagonist roles can reverse depending on the direction of the movement. For example, during the upward phase of a press-up, the biceps are the agonist and the triceps are the antagonist. However, during the downward phase, the triceps contract to control the extension of the elbow, becoming the agonist, while the biceps relax and become the antagonist.
In some cases, other muscles called fixators or synergists assist antagonistic pairs by supporting and stabilising the joint and the rest of the body. For instance, the abdominals act as fixators to stabilise the body for hip and knee movements.
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Muscle groups and exercise
Muscle groups are sets of individual muscles that can be targeted through exercise. There are generally six muscle groups that people train and exercise: legs, arms, shoulders, back, chest, and abs. These groups are further divided into more specific muscles. For example, the leg muscle group is divided into calves, hamstrings, quadriceps, and glutes.
There are several ways to group exercises and muscles together for a workout routine. One way is to separate strength training exercises by muscle groups to give them more time to recover. Another way is to group exercises by their “push” or “pull” movements. For example, a push-up or bench press targets the "push" muscles.
There is no right or wrong way to create a strength training routine or pair muscle groups together. However, pairing certain muscle groups can make workouts more efficient. For example, many people find it helpful to pair muscle groups that are close together. Additionally, compound exercises work several muscle groups at once or require movement in more than one joint to complete a movement. These are called multi-joint exercises (MJE) and include squats, bench press, deadlift, and shoulder press. Isolation exercises, also known as single-joint exercises (SJE), target a more specific muscle within a muscle group. For example, the bicep curl targets the bicep muscles, with other muscles in the shoulders and core also helping to lift the weight.
It is important to note that the best exercises to include in a workout will depend on factors such as body composition, goals, and availability. Additionally, the intensity of exercises and proper rest between workouts are important factors in determining muscle growth and strength gains.
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Types of muscle
The human body has about 600 muscles, which can be categorised into three main types: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and allow movement. They are also referred to as voluntary muscles as they are under our conscious control. Skeletal muscles can be further grouped into opposing pairs, such as the biceps and triceps, which work in tandem to move body parts. In an antagonistic muscle pair, one muscle contracts to move a body part, while the other relaxes or lengthens to return the body part to its original position. For example, during a bicep curl, the biceps contract to produce movement, while the triceps relax to allow the movement to occur.
Smooth muscles, on the other hand, are located in the walls of hollow visceral organs like the liver, pancreas, and intestines, as well as structures such as the digestive tract, uterus, and blood vessels. They are also known as involuntary muscles, as their movement happens without our conscious awareness. Smooth muscles contract in waves along the length of the structure they line.
The third type of muscle is cardiac muscle, which is a special type of muscle tissue found only in the heart. Cardiac muscle is also under involuntary control.
Additionally, muscles can be grouped by their location, such as chest, leg, or back muscles, or by the type of movement they perform, such as abductors, flexors, or extensors. When creating a strength training routine, it is common to pair certain muscle groups together to make workouts more efficient and maximise the benefits of each workout. For example, compound exercises like squats work multiple muscle groups simultaneously, while isolation exercises target specific muscles within a muscle group.
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Frequently asked questions
Muscles work in pairs to move the skeleton. One muscle of the pair contracts to move a body part, and the other muscle in the pair then contracts to return the body part to its original position.
Muscle contraction cannot push a bone back into its original position, so muscles work in pairs to move the body.
Antagonistic muscle pairs refer to when one muscle contracts and the other muscle relaxes or lengthens to allow movement to occur. The muscle that is contracting is called the agonist, and the muscle that is relaxing or lengthening is called the antagonist.
When performing a bicep curl, the biceps contract to produce movement, while the triceps relax to allow the movement to occur. Another example is the quadriceps and hamstrings, which work as antagonistic pairs when extending or flexing the knee.
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