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| | Conceptual definition used in Phases I and II-1 validation by two movement experts | Operational definition used in Phase II-2 validation by testing healthy children |
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| Required/targeted training skills | | |
| Unilateral reaching | Movements of the upper extremities that use 1 hand or arm. | Number of upper-extremity movements using 1 hand between 30 seconds after play started and 1 minute and 30 seconds. |
| Bilateral reaching | Movements of the upper extremities that use 2 hands or arms. Bilateral reaching can be symmetrical (both arms perform the same joint motions) or alternative (e.g., one arm is extending while the other is flexing). | Number of upper-extremity movements using both hands between 30 seconds after play started and 1 minute and 30 seconds. |
| Speed | The game requires the player to reach faster, since faster is better. | Number of arm movements per minute |
| Cognition | This game requires some cognitive abilities. For example, someone with intellectual disabilities may not understand the game rules and may not be able to play the game. | † |
| Accuracy | The game requires some precision. | † |
| Muscular endurance | The ability of muscle to sustain forces repeatedly or to generate forces over a period of time. Muscular endurance refers to the body’s ability to continue using muscular strength and endure repeated contractions for an extended period of time. Usually, if the game requires the player to constantly repeat the same arm movements over time, it requires muscular endurance. | Total number of arm movements performed in the 3-minute interval |
| Cardiovascular endurance | The ability of the body to sustain prolonged rhythmical exercise and perform work and participate in an activity over time. Cardiovascular endurance is the power, strength, or ability of the heart to supply enough oxygen to muscles during a physical activity for a prolonged period of time. It essentially indicates how strong one’s heart is and can potentially add years to one’s life. This can be measured by heart rate change. | Four heart rate related indicators: maximal heart rate change, maximal heart rate, average heart rate, and percentage of heart rate reserve = (maximal heart rate during the game—resting heart rate)/[(208—age * 0.7) —resting heart rate] |
| Eye-hand coordination | The coordinated control of eye movement with hand movement. The ability to guide the movements of the hand with the eyes. | † |
| Strength | Muscle force exerted by a group of muscles to overcome a resistance in a specific set of circumstances. | † |
| Feedback provided | | |
| Knowledge of results | Information about the outcome of the action Individual action: information about the outcome of each action (e.g., a banging sound after hitting an object). Whole game: information about the outcome after playing the whole game (e.g., the total score of the game, number of opponents being hit) | † |
| Knowledge of performance | Information about the pattern of action, for example, the player can see his/her movement while performing the task. | † |
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