In a Break Test, how is the resistance applied?

In a Break Test, how is the resistance applied?

• A. End-range
• B. Fully flexed
• C. Neutral, midrange position
• D. The resistance is applied and gradually increased to a maximum over 3 to 5 seconds

Answer: (C)

In a Break Test, you want to challenge the muscle where it can produce its strongest force without the complicating influences of joint end-range or excessive slack. That means applying resistance at a neutral, midrange position of the joint. Testing in end-range brings in passive tension from ligaments and the joint capsule, which can make the muscle seem weaker than it truly is. Testing with the muscle fully shortened also reduces force-generating potential due to the length-tension relationship. So the most reliable way to assess pure muscle strength is to apply resistance in the middle of the range, where the muscle length supports maximal isometric force. (The way resistance is increased toward a maximum is a testing detail, but the key factor here is the midrange position.)

In a Break Test, you want to challenge the muscle where it can produce its strongest force without the complicating influences of joint end-range or excessive slack. That means applying resistance at a neutral, midrange position of the joint. Testing in end-range brings in passive tension from ligaments and the joint capsule, which can make the muscle seem weaker than it truly is. Testing with the muscle fully shortened also reduces force-generating potential due to the length-tension relationship. So the most reliable way to assess pure muscle strength is to apply resistance in the middle of the range, where the muscle length supports maximal isometric force. (The way resistance is increased toward a maximum is a testing detail, but the key factor here is the midrange position.)