The purpose of this flexibility test is to measure trunk and shoulder flexibility, which is important for injury prevention and is particularly important in swimming, racket sports and throwing sports. See also the similar Acuflex II Trunk Rotation Test.

Equipment Required

Wall, a piece of chalk or pencil, ruler or tape measure.

Pre-Test Procedures

Explain the test procedures to the subject. Perform screening of health risks and obtain informed consent. Prepare forms and record basic information such as age, height, body weight, gender, test conditions. Perform an appropriate warm-up. See more details of pre-test procedures.

Test Procedure

Mark a vertical line on the wall. Stand with your back to the wall directly in front of the line, with your feet shoulder width apart. You should be about arms length away from the wall, though you may need to adjust the distance from the wall once you start the test. Extend your arms out directly in front of you so they are parallel to the floor. Twist your trunk to your right and the touch the wall behind you with your fingertips, keeping your arms extended and parallel to the floor. You are allowed to turn your shoulders, hips and knees as long as your feet don't move. Mark the position where your fingertips touched the wall, and measure the distance from the line. A point before the line is a negative score and a point after the line is a positive score. Repeat for the left side with your feet in the same position.

Scoring

Take the average of the two scores (left and right sides). Use the table below to convert the score measurement to a rating.

Rating Score
Excellent 20 cm
Good 15 cm
Very Good 10 cm
Fair 5 cm
Poor 0 cm

Advantages

This is a simple and quick test to perform, and athletes can self-administer the test.

Disadvantages

Variations in arm length between individuals may make comparisons more difficult.

Sport-Specific Applications

Trunk rotation flexibility is particularly valuable for athletes in sports requiring rotational power and mobility. Swimmers benefit from improved trunk rotation during freestyle and backstroke for better body roll. Tennis, squash, and badminton players require rotational flexibility for powerful groundstrokes and serves. Golfers need excellent trunk rotation for a full backswing and follow-through. Throwing athletes in track and field events such as discus, shot put, and javelin rely heavily on rotational mobility for generating power. Baseball and softball players use trunk rotation for batting and throwing mechanics.

How to Improve Trunk Rotation

Athletes looking to improve their trunk rotation scores should incorporate regular stretching and mobility exercises targeting the thoracic spine, obliques, and hip rotators. Effective exercises include seated spinal twists, supine trunk rotations with bent knees, cat-cow stretches with rotation, and thoracic spine extensions over a foam roller. Dynamic warm-up drills that incorporate rotation should be performed before training. Consistency is essential for making lasting improvements in rotational flexibility. Most athletes can expect to see improvement within 4-6 weeks of dedicated mobility work.

Frequently Asked Questions

What is a good trunk rotation test score?

An excellent trunk rotation score is 20 cm or more past the centerline. Good is 15 cm, very good is 10 cm, fair is 5 cm, and poor is 0 cm or below. Scores should be averaged between left and right sides for a complete assessment.

Why is trunk rotation flexibility important for athletes?

Trunk rotation flexibility is crucial for injury prevention and performance in sports requiring rotational movements such as swimming, tennis, golf, baseball, and throwing events. Good rotational mobility allows for greater range of motion and power generation.

How often should I test my trunk rotation flexibility?

Athletes should test trunk rotation flexibility every 4-6 weeks during training cycles to monitor progress. More frequent testing may be appropriate during rehabilitation or when specifically working on rotational mobility.

Can arm length affect trunk rotation test results?

Yes, variations in arm length between individuals can affect the distance reached during the test. This is why the test is best used for tracking individual progress over time rather than comparing between different athletes.

How do I improve my trunk rotation flexibility?

Improve trunk rotation through regular stretching exercises targeting the thoracic spine, obliques, and hip rotators. Exercises include seated spinal twists, supine trunk rotations, and thoracic spine mobilizations. Consistency is key for lasting improvements.

Should I warm up before the trunk rotation test?

Yes, perform a light warm-up before testing to ensure accurate results and prevent injury. Include general movement and dynamic stretches for 5-10 minutes before conducting the test.

What is the difference between trunk rotation and spinal mobility?

Trunk rotation measures the combined rotational flexibility of the trunk, shoulders, and hips working together. Spinal mobility specifically refers to movement of the vertebral column. This test assesses functional rotational ability rather than isolated spinal movement.

References

  1. Johnson, B.L., & Nelson, J.K. (1986). "Practical Measurements for Evaluation in Physical Education." Burgess Publishing Company.
  2. Heyward, V.H. (2010). "Advanced Fitness Assessment and Exercise Prescription." Human Kinetics, 6th Edition.
  3. Alter, M.J. (2004). "Science of Flexibility." Human Kinetics, 3rd Edition.
  4. American College of Sports Medicine. (2021). "ACSM's Guidelines for Exercise Testing and Prescription." Wolters Kluwer, 11th Edition.
  5. Norkin, C.C., & White, D.J. (2016). "Measurement of Joint Motion: A Guide to Goniometry." F.A. Davis Company, 5th Edition.
  6. Cook, G. (2010). "Movement: Functional Movement Systems." On Target Publications.
  7. Kendall, F.P., et al. (2005). "Muscles: Testing and Function with Posture and Pain." Lippincott Williams & Wilkins, 5th Edition.