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The hamstring muscle group is comprised of three muscles: the semitendinosus, the semimembranosus, and the biceps femoris. These muscles are located at the back of the thigh, starting at the pelvis and extending to the knee. They are responsible for hip and knee movements, including walking, squatting, bending the knees, and tilting the pelvis. Hamstring muscles are prone to injury, especially during activities that involve quick stops and starts, such as sprinting or playing soccer. These injuries can range from mild strains to complete tears and may require surgery or other treatment options.
| Characteristics | Values |
|---|---|
| Number of muscles | 3 |
| Muscle names | Semitendinosus, Semimembranosus, Biceps femoris |
| Muscle lengths | 44.3 cm, 42.0 cm, 38.7 cm, 29.7 cm |
| Muscle functions | Flexing the knee, extending the hip, rotating the lower leg |
| Muscle injuries | Pulled hamstring, partial tear, complete tear |
| Muscle injury treatment | Nonsurgical treatments, surgery |
| Muscle injury prevention | Warm-ups, stretches, rest |
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What You'll Learn
Hamstring injuries
A pulled hamstring or strain is an injury to one or more of the muscles at the back of the thigh. The hamstring muscles run down the back of the thigh, starting at the pelvis and extending to the knee. They are composed of three muscles: the biceps femoris, semitendinosus, and semimembranosus.
Most hamstring injuries occur in the thick, central part of the muscle or where the muscle fibres join tendon fibres. Muscle overload is the main cause of hamstring strain, which can happen when the muscle is stretched beyond its capacity or challenged with a sudden load. They often occur when the muscle lengthens as it contracts or shortens, such as during sprinting when the back leg is straightened and the toes are used to push off and move forward.
There are three grades of hamstring injury: a minor muscle pull or strain (grade 1) may take a few days to heal, while a partial hamstring tear (grade 2) is more painful and may take weeks to recover. Severe hamstring tears (grade 3) are very painful and may take several months to heal. During the first few days, RICE therapy (rest, ice, compression, and elevation) is recommended for treating hamstring injuries.
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Hamstring anatomy
The hamstring muscle group is comprised of three muscles: the semitendinosus, the semimembranosus, and the biceps femoris. These muscles are located in the back of the thigh, starting at the pelvis and extending to the knee. They are considered true hamstrings because they cross both the hip and knee joints, allowing for knee flexion and hip extension.
The semitendinosus is the longest muscle in the hamstring group, measuring an average of 44.3 cm. It is located between the semimembranosus and the biceps femoris at the back of the thigh. This muscle is responsible for flexing the knee, extending the hip, and rotating the lower leg inwardly when the knee is bent.
The semimembranosus is a long muscle at the back of the thigh, beginning at the pelvis and extending to the tibia (shin) bone. It is the largest of the hamstrings and allows for the thigh to extend, the knee to flex, and the tibia to rotate.
The biceps femoris is a long muscle that begins in the thigh area and extends to the head of the fibula bone near the knee. It is located on the outer part of the thigh. This muscle is responsible for flexing the knee, extending the thigh at the hip, and rotating the lower leg outwardly when the knee is bent.
The hamstring muscles are susceptible to injury, especially during activities that involve quick stops and starts, such as running, sprinting, and jumping. A common hamstring injury is a "pulled hamstring" or strain, which can range from a mild pull to a complete tear of the muscle. To prevent injuries, it is important to properly warm up and stretch before physical activity and to rest the muscles when feeling pain or fatigue.
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Daily activities enabled by hamstrings
The hamstring muscle group is comprised of three muscles: the semitendinosus, semimembranosus, and biceps femoris. These muscles are located at the back of the thigh, starting at the pelvis and extending to the knee. They are responsible for hip and knee movements, including walking, bending the knees, and tilting the pelvis.
Daily activities that rely on the hamstrings include:
Walking
The hamstrings are essential for walking, as they work in tandem with the quadriceps to decelerate knee extension. They also help to stabilise the knee joint, resisting anterior translation of the tibia during the heel strike phase of the gait cycle.
Running
The hamstrings play a crucial role in running, providing the necessary knee flexion and hip extension. However, they are also susceptible to injury during running, especially when sprinting or suddenly changing direction, as the muscle can be overstretched.
Climbing stairs
The act of climbing stairs requires knee flexion and hip extension, which are both facilitated by the hamstrings.
Squatting
Squatting involves bending at the knee and hip joints, which are controlled by the hamstrings.
Jumping
Jumping is another explosive action that relies on the hamstrings. The muscles help to generate the necessary force for the body to propel itself upwards.
In summary, the hamstring muscles are vital for many daily activities, enabling us to walk, run, climb stairs, squat, and jump. By facilitating knee flexion and hip extension, the hamstrings allow us to perform a wide range of movements and maintain stability.
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Preventing hamstring injuries
Hamstring muscles are the three posterior thigh muscles in human anatomy between the hip and the knee: the semimembranosus, semitendinosus, and biceps femoris. They play a critical role in human activities ranging from standing to explosive actions such as sprinting and jumping. They are also very prone to injury, especially in athletes who sprint, run at fast speeds, or play sports that require quick stops and starts, such as soccer or football.
To prevent hamstring injuries, it is important to do proper warm-ups and stretches before physical activity. A warm-up routine should include dynamic stretching exercises and light cardiovascular exercises to increase blood flow to the muscles and prepare them for action. It is also important to stretch frequently and incorporate static stretching into your routine to increase flexibility in your hamstrings. Hold each stretch for 15–30 seconds without bouncing or forcing it.
You can also strengthen your hamstrings to improve muscle stability and strength. The Nordic hamstring curl is a highly specific exercise targeted at strengthening your hamstring muscle. Research has shown that using this exercise preventatively can reduce the injury rate by as much as 80%. The exercise works the hamstring eccentrically, meaning the muscle is working hard (contracting) while it is lengthening (stretching).
In addition to stretching and strengthening exercises, it is important to listen to your body and pay attention to any warning signs or discomfort in your hamstrings. Take breaks and avoid overdoing physical activities to give your hamstrings adequate time to rest and recover. Make sure to stay hydrated before, during, and after physical activities to keep your muscles functioning optimally. Finally, wear appropriate footwear that provides adequate support and cushioning to reduce the risk of hamstring injuries.
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Hamstring muscle groups
The hamstring muscle group is comprised of three muscles: the semitendinosus, the semimembranosus, and the biceps femoris. These muscles are located in the back of the thigh, starting at the pelvis and extending to the knee. They are responsible for hip and knee movements, such as walking, bending the knees, and tilting the pelvis. The hamstrings also play a crucial role in more explosive actions such as sprinting and jumping.
The semitendinosus is the longest muscle in the hamstring group, measuring an average of 44.3 cm. It is located between the semimembranosus and the biceps femoris at the back of the thigh. This muscle helps to flex the knee and extend the hip when the trunk is fixed, and it also medially rotates the lower leg when the knee is bent.
The semimembranosus is a long muscle at the back of the thigh that begins at the pelvis and extends to the tibia (shin) bone. It is the largest of the hamstrings and allows for the thigh to extend, the knee to flex, and the tibia to rotate.
The biceps femoris is a long muscle that begins in the thigh area and extends to the head of the fibula bone near the knee. It is located on the outer part of the thigh. This muscle is involved in flexing the knee, extending the thigh at the hip, and rotating the lower leg from side to side when the knee is bent. The short head of the biceps femoris is sometimes excluded from the 'hamstring' characterization as it only crosses one joint (the knee) and is not involved in hip extension.
Hamstring muscles are very susceptible to injury, especially in athletes who participate in activities that require quick stops and starts, such as soccer and football. A common hamstring injury is called a "pulled hamstring" or strain, which can range in severity from a mild pull to a complete tear of the muscle. To prevent hamstring injuries, it is important to properly warm up and stretch before physical activity and to rest the muscles if you feel pain or fatigue.
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Frequently asked questions
Hamstring muscles are skeletal muscles at the back of your thigh, which help with hip and knee movements for walking, bending your knees, tilting your pelvis, and more.
There are three hamstring muscles: semitendinosus, semimembranosus, and biceps femoris.
Hamstring injuries are common in athletes who run, jump, sprint, or perform any other activities that require quick stops and starts. They can also occur in skiers, skaters, dancers, and other athletes who often have their knees bent in deep squat positions.
You can prevent hamstring injuries by doing proper warm-ups and stretches before physical activity.
If you have a hamstring injury, you should seek immediate medical attention. Treatment for hamstring injuries ranges from conservative management to operative fixation.
