Trunk Curl-up: Assesses abdominal and hip flexor activation.
The test is performed with the patient in supine position, with feet on the treatment table. The examiner puts his hand under the patient’s heels and the patient is asked to curl up in a seated position.
Normally there will be no loss of pressure during the curl up, but there will be a little during the end of the movement, the sit-up, because hip flexor become predominant over the abdominals.
If the loss of pressure is abnormal it is a sign of overactivation of the hip flexors.
It is important to pay attention at the patient’s preferred way of curling up: if a kyphosis is noticed there is an adequate use of abdominals, if the flexion of thoracic spine is minimal with anterior pelvic tilt it means that the hip flexors are overactive (Page et al, 1967).