ATC Aquatic Kinesiology & Biomechanics 2

Question 1

In aquatic biomechanics, the 'metacentric couple' refers to the rotational tendency created by:

Accepted Answer

The offset between the center of gravity and center of buoyancy

Answer

Equal forces applied at the head and feet simultaneously

Answer

Turbulence generated by opposing swimmers

Answer

Hydrostatic pressure differences between left and right sides

Question 2

When a therapist instructs a patient to 'streamline' a limb by moving the hand blade-first through water, which type of drag is primarily reduced?

Accepted Answer

Form drag

Answer

Skin friction drag

Answer

Wave drag

Answer

Induced drag

Question 3

Metacentric height in aquatic biomechanics is best defined as:

Accepted Answer

The vertical distance between the metacenter and the center of gravity, indicating rotational stability

Answer

The optimal pool depth for therapeutic immersion

Answer

The height of the patient's center of mass above the pool floor

Answer

The water surface height relative to a patient's landmarks

Question 4

Turbulent flow conditions created during aquatic therapy are most clinically valuable for:

Accepted Answer

Increasing resistance and balance challenge through unpredictable forces

Answer

Reducing joint compression forces

Answer

Decreasing water temperature around inflamed joints

Answer

Lowering hydrostatic pressure for edema management

Question 5

The concept of 'added mass' in aquatic biomechanics is most accurately described as:

Accepted Answer

The mass of surrounding water that must be accelerated along with a moving body segment

Answer

Weight gain due to water absorption during therapy sessions

Answer

Equipment weight added to increase resistance during exercise

Answer

The increase in apparent body weight from hydrostatic pressure

Question 6

Compared to land-based exercise, aquatic exercise most commonly demonstrates which pattern of muscle activation?

Accepted Answer

Altered co-contraction patterns with reduced eccentric demands during buoyancy-assisted phases

Answer

Identical muscle recruitment sequences in all planes

Answer

Greater eccentric demand due to buoyancy opposition during downward movements

Answer

Exclusively concentric muscle contractions in all movement directions

Question 7

Frontal resistance (form drag) during upper extremity aquatic exercise is greatest when the patient moves the limb:

Accepted Answer

Perpendicular to the direction of movement with maximum surface area exposed

Answer

Parallel to the water surface at slow speed

Answer

At the water surface to take advantage of wave drag

Answer

With the elbow flexed to 90 degrees regardless of speed