Attain
At a specified organizational level, reach a defined state or objective under specified constraints.
Scientific foundations
Attain. Sustain. Maintain.
A hierarchical, scale-dependent framework used with existing approaches to classify constraints and limitations impacting whether a system can reach an objective, continue meeting it, and preserve or adapt the capacity required across repeated demands and longer timescales.
These are relational, scale-indexed dimensions of functional capability, not fixed properties of a person.
A defensible statement must specify which system is attaining or sustaining which objective, under which constraints, at what workload, for what duration, and for what higher-level purpose.
Working definitions
Distinguish the dimensions without separating the system.
Sustain
Continue meeting that objective for the required duration despite resource use, perturbation, and change.
Maintain
Preserve, recover, or adapt the resources and organization needed to attain and sustain relevant objectives across repeated demands and longer timescales.
The dimensions may operate simultaneously at different scales. Maintaining function does not require maintaining an identical movement pattern.
Hierarchical and stratified
Success at one level does not establish success at another.
Lower levels support and constrain higher levels. Higher-level tasks impose demands on lower levels. The same task outcome can emerge from different combinations of resources and coordination.
| Scale | Attain | Sustain | Maintain |
|---|---|---|---|
| Molecular and cellular | Regenerate ATP at the required rate | Continue supply, transport, and regulation | Preserve cellular integrity and adaptability |
| Muscle fiber and motor unit | Generate required tension | Continue required excitation and tension | Recover resources and adapt rate or capacity |
| Muscle and joint | Produce required force or torque | Preserve task-relevant mechanical output | Preserve or adapt mechanical capacity |
| Limb and coordination | Form a task-effective movement solution | Stabilize or adapt the solution during performance | Retain or reorganize available solutions |
| Whole-person activity | Stand, walk, reach, or transfer | Continue for the required duration | Recover and retain repeated-task capability |
| Participation | Enter a meaningful activity or role | Remain engaged as required | Preserve participation across changing conditions |
Required coordinates
No capability claim is complete without its conditions.
- 01Focal organizational scale
- 02Objective and higher-level purpose
- 03Lower-level dependencies and available resources
- 04Selected activity and workload
- 05Required duration and repetition
- 06Task and environmental constraints
- 07Success and intolerance criteria
- 08Adaptation or compensatory strategy
- 09The person’s participation goal
Iterative clinical logic
When the objective is met, change the demand.
The 2020 heart-failure guideline algorithm asks whether an activity can be performed, then whether endurance limits it, and then whether a new task or higher workload is needed. The result of one examination determines the next question.
- 01Specify the objective and its scale.
- 02Determine whether it can be attained.
- 03Determine whether it can be sustained.
- 04Change workload, duration, task, or environment.
- 05Evaluate recovery, adaptation, and repeated capability.
Scientific status
A documented foundation and a developing synthesis.
Physiology and clinical decision logic
The Clinical Physiology text explicitly distinguishes attaining and sustaining tension and connects adaptation to attaining, sustaining, and maintaining capacity. The heart-failure guideline embeds performance and endurance decisions in a published clinical algorithm.
Functional capability across levels
Extending this logic from physiological and clinical examples to coordination, activity, participation, and multiple timescales is a reasoned synthesis.
Operational measures and experiments
Construct-specific definitions, perturbations, measurements, and validation studies are still required before the framework can support empirical claims.
Relationship to established foundations
A cross-cutting framework, not a replacement theory.
Dynamic systems and constraints approaches help investigate how a movement solution emerges. Dynamic-resource models help investigate how it is produced. Ecological approaches address information and possibilities for action. ICF organizes activity and participation. Attain, Sustain, and Maintain asks a different but related question: whether relevant systems can meet, continue meeting, and preserve or adapt capability for a specified objective.
Holt, Wagenaar, and Saltzman (2010) and Guccione, Neville, and George (2019) establish important scientific context. They are not presented as the originators of this developing synthesis.