Tight hamstring muscles are common and most of the time will not cause a problem. However, they may be more prone to severe strains or contribute to other problems such as back pain and postural issues. Tight hamstrings mean you can't train and compete at full capacity as the muscles aren't fully healthy. Read more on the causes of this hamstring injury and what you can do to help it.
On this page:
- Tight hamstrings explained
- Types of hamstring stretches
- Assessing flexibility
- Static hamstring stretches
- Dynamic hamstring stretches
- PNF stretches
In addition to an increased injury risk, tight hamstrings may affect sports performance making some techniques difficult or impossible such as in high hurdling or martial arts techniques. Forcing a muscle to move at speed outside of its comfortable range will increase the chance of a muscle tear.
Tight hamstrings explained
The hamstring muscle group consists of the semitendinosus, semimembranosus and biceps femoris muscles.
Tight hamstrings can cause the hips and pelvis to rotate back flattening the lower back and causing back problems. Tight hamstrings can also be responsible for postural problems and other back problems such as sacroiliac joint pain, as they will tend to pull the pelvis out of normal position.
If your muscles have tightened up then blood has been squeezed out of them, therefore, your muscles are working at less than 100 % of capacity and your performance will be down as a result. Regular sports massage for hamstring muscles and hamstring stretching to improve muscle condition will not only reduce the likelihood of injury but may also improve sporting performance.
The causes of tight hamstring muscles are varied. Genetics is one reason. You can be born with naturally short hamstrings when some people are naturally supple. In general women and children are more supple than men.
Not enough stretching. If you participate in a lot of sport and do not stretch properly then you are more likely to have your hamstrings tighten up. It is especially important to stretch properly after exercise as this is when the muscles are warm and more receptive to stretching. If you tend to make a beeline for the bar after your game of football, think about spending 10 minutes stretching first.
Problems in your lower back can put pressure on your sciatic nerve which runs down the legs and causes muscles to tighten.
The normal range of hip flexion measured when laying flat on your back and raising the leg straight off the floor knee straight permitted by the hamstrings is in the region of 80-90 degrees. Anything less than 80 degrees is considered tight.
Stretching the hamstring muscles
Even if you are not naturally supple you can still improve your flexibility by stretching. Types of stretching include dynamic, static, passive, PNF and CRAC. Avoid ballistic stretching which is bouncing and forcing the muscle to go further than is comfortable and will damage it. Sports massage can help in loosening tight muscles. Have a regular sports massage on the legs.
Tight hamstring muscles require regular stretching. There are numerous ways to stretch the hamstring muscles. We explain the more common hamstring stretching exercises and why they work.
Assessing hamstring flexibility
The athlete lies on their back and relaxes. The therapist gently lifts a relaxed, straight leg up until the athlete indicates it is uncomfortable to go further. The therapist should notice an increased resistance even before the athlete feels a stretch. The athlete will then feel the stretch beginning and eventually can go no further. Ideally, the leg should go vertically upwards without pain for good flexibility. The image opposite shows a 90-degree range of motion which is considered good. Below 80 degrees is considered tight.
Static hamstring stretches
Why does it work?
When you initiate the stretch, signals from muscle spindles go to the spine which sends back signals to contract the muscle or resist the stretch. After 6 seconds or so the Golgi tendon organs send signals overriding the signals from the muscle spindles enabling the muscle to relax into the stretch.
Static stretch seated
Sit with on the floor with the leg to be stretched out straight and the other bent out of the way. Rotate the straight leg inwards and lean forward at the hips to feel a stretch under the thigh. Hold the stretch for 30 seconds. Repeat the stretch throughout the day at least 5 times. This stretch can also be repeated with the foot turned outwards.
Standing hamstring stretch
Stand with the leg to be stretched just in front of the other one. Bend the back knee and lean forward from the hips. Place your hands on the bent leg's thigh, to balance yourself. If you can't feel a stretch, lean further forwards or tilt your pelvis forwards. Hold for 30 seconds. Repeat regularly throughout the day.
Hamstring stretch on the back
Stretching the hamstring muscles by lying on the back and straightening the leg upwards targets the muscle fibers nearer to the knee whereas the sitting hamstring stretch stretches the muscle fiber higher up the muscle nearer the buttocks.
Dynamic hamstring stretches (play video)
This involves gentle swings of the leg forwards and backward gradually getting higher and higher each time. Around 10 to 15 swings on each leg should be enough. The stretches can be done early in the morning (be careful not to force it) as this will set the length of muscle spindle for the rest of the day.
Why does it work?
This works by using the properties of muscle spindles. A muscle spindle is a sensor in a muscle that senses the amount of stretch and speed of stretch. By gradually taking the leg higher and higher the muscle spindle allows it to go safely and lengthen the muscle. If the muscle is forced then a stretch reflex is initiated which causes a reflex contraction (shortening) of the muscle. This is called ballistic stretching and can damage muscles.
PNF (proprioceptive neuromuscular facilitation)
These are stretching techniques involving the stretch reflex. One type is called CRAC stretching (Contract, Relax, Agonist, Contract). The method is as follows:
Warm up gently either by a short run or lying on your back and pushing a straight leg down 20 times against light resistance. Lie on back and get a partner to lift one leg up gently as far as it will go. Contract - Push against resistance with a straight leg at 25% effort. The resistance must be great enough so that the leg cannot move. Hold for 10 seconds then relax. The athlete then uses the hip flexor muscles (agonists) to pull the leg up as high as they can, keeping it straight and holding this for up to 10 seconds. Repeat the process until no more gains are possible (contract).
Why does it work?
PNF stretching methods make use of the 'stretch reflex' as mentioned in Dynamic stretching. The muscle spindles sense stretch and speed of stretch, Golgi tendon organs sense tension in the muscle. When an agonist muscle contracts (quadriceps) there are nerve impulses sent to the hamstrings (antagonist) to relax. (They would have to as if you straightened a bent leg it would not move unless the hamstrings relax). There is also a theory that the muscle becomes stronger in a stretched position so the nervous system can allow it to stretch further without fear of tearing.
Overall program for stretching hamstrings
Dynamic stretching first thing in the morning as this sets the length of the muscle spindles for the rest of the day. Dynamic stretching should also always be done prior to fast, explosive exercise as part of a warm-up
Static stretching - hold for 30 seconds, repeat 5 times, can be done 3-5 times a day. Once in the evening is often enough though to maintain.
PNF / CRAC - this can be done daily but do not overdo this as you could tire the muscle out. If in doubt three times a week is ok.
If you continually have problems with tight hamstrings especially if it is only on one side then you might have restricted nerves in the back or piriformis syndrome.
Massage for Tight Hamstrings
Tight hamstrings need stretching, but massage can also help by stretching the muscles sideways or transversely which cannot be done by simple stretching. In addition, increasing blood flow and relaxing muscles will help them stretch more easily. Scar tissue and adhesions can also be broken down using deep massage techniques.
This sports massage video is intended for information purposes only. We recommend seeking professional advice before attempting any self-help treatment.
Before attempting massage your therapist will check for contraindications. This means that massage would be dangerous to perform if you have any contraindications.