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Steady-state
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Base of support
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Stable to instable: bipedal – semi-tandem – tandem – one leg stance (Figure 2)
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Position of feet
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i.e., lateral or medial weight shift, on heels or toes, toe angle in or out
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Surface
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i.e., from soft to hard (e.g., grass to concrete), from stable to instable (e.g., concrete to sand)
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Sensory input
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Impede vision or hearing
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Dual-/Multi-tasking
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Additional motor task – additional cognitive task – additional motor and cognitive tasks
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Speed of movement
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Decrease or increase of execution speed (i.e., upper arm movements)
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Equipment
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Use of i.e., free weights, elastic bands, balls
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Reactive
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Controlled perturbations applied by therapist
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Reaction to external thread (push or pull) varying in speed, amplitude and direction on ankle, hip, trunk or shoulder level
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Proactive
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ADL
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Combination of steady-state (static) balance tasks with mobility in daily life (e.g., standing up from a chair while reciting a poem and holding a cup of water)
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