Tread (TRD)
INTRODUCTIONTreading is a method of remaining at the surface in one location in aquatic environments, and is considered a way to conserve energy. It is characterized by the use of the limbs to generate upward propulsion and maintain a vertical body position with the head above the surface. Becoming proficient with the Tread skill develops Stationary Surface Competency and Risk Competency, as well as Breath Control Competency.
Trending, when compared to other energy conservation and stationary skills, has unique benefits primarily associated with the head being elevated. Not only does this position allow for ease of breathing, it also provides the ability to see in any direction with an enhanced field of vision, the ability to call for help, and reduces heat loss. Additionally, treading can be performed using only the legs, allowing the hands and arms to be free for other tasks, such as reaching for a nearby object or waving for help.
When first learning to Tread, individuals should focus on the use of both the arms and the legs to keep the body at the surface. The movements should be intentional, especially the arms, where actions like sculling are much more effective than ‘ladder climbing’ or dog paddle. (These actions are not far off from an instinctual drowning response.) As individuals become more comfortable with treading, the focus should be on energy conservation. This focus includes cognitive aspects, such as discussing how to conserve energy in aquatic environments, as well as physically practicing the ability to tread for long durations emphasizing coordinated and efficient movements with the limbs. Additionally, multiple styles of kicking can be explored for use in different circumstances, such as the ‘egg-beater’ kick which provides continuous upward propulsion and, when mastered, can allow the arms to be held out of the water for other tasks.
The Tread skill is defined as the following:
Body
Body positioned vertically
Body in stationary location
Head above surface
Arms
Arms move to continuously generate upward propulsion
Legs
Legs move to continuously generate upward propulsion
Breathing
Breathing controlled and regular
Test Course
This test should be performed in water that is overhead in depth or in the deepest area available. Avoid areas where it may be difficult to Tread without touching the bottom of the pool. When shallow depth is the only option, use your best judgement to determine if touching the bottom incidentally is providing a force significant enough to keep the students head above the surface.
Scoring
The Tread skill is assessed by measuring time. The following scoring rules specify when to halt the assessment. A single measurement is recorded based on the instructor’s judgment of the student’s performance.following scoring rules specify when to halt the assessment. A single measurement is recorded based on the instructor’s judgment of the student’s performance.
Record time treading until student exhibits any of the following:
✖ Requires assistance or becomes unsafe
✖ Does not maintain a mostly vertical body position
✖ Has excessive lateral or directional movement
✖ Has face mostly below the surface
✖ Stops generating upward propulsion
✖ Uses the pool bottom to keep face above the surface
✖ Holds on to a stationary object or flotation aid
✖ Touches the pool wall or another student repeatedly
✖ Does not breathe in a controlled and regular manner
✔ Reaches maximum duration of 60 seconds