2.2 Activity Analysis & Environmental Assessment

Activity Analysis & Environmental Assessment

Core Principle: Occupational therapy practitioners possess a unique clinical skill: the ability to analyze activities in terms of their inherent mechanical, cognitive, sensory, and social demands, and subsequently re-engineer those demands through grading (to remediate impairment) or adapting (to compensate for functional loss).

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Activity Analysis vs. Occupational Analysis

The OTPF-4 draws a critical theoretical and clinical distinction between Activity Analysis and Occupational Analysis:

+-----------------------------------------------------------------------------------+
|                         ACTIVITY vs. OCCUPATIONAL ANALYSIS                        |
|                                                                                   |
|  ACTIVITY ANALYSIS (Decontextualized)      OCCUPATIONAL ANALYSIS (Contextualized) |
|  ------------------------------------      -------------------------------------- |
|  * Generic analysis of how a task is       * Analysis of a specific person doing  |
|    typically done in a given culture.        the task in their actual context.    |
|  * Independent of any specific person.     * Embedded in personal habits,         |
|  * Evaluates baseline human capacity         routines, values, and environment.   |
|    and equipment required for the task.    * Evaluates subjective meaning and     |
|  * Example: Analyzing the generic motor      real-world contextual barriers.      |
|    and cognitive demands of boiling        * Example: Analyzing how John, who has |
|    pasta in a standard kitchen.              a left CVA and hemiparesis, makes    |
|                                              spaghetti in his narrow kitchen.     |
+-----------------------------------------------------------------------------------+

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Analyzing Activity Demands (OTPF-4 Taxonomy)

When conducting a comprehensive activity analysis, the occupational therapist systematically examines seven interactive parameters:

1. Relevance and Importance: Meaning attached to the occupation within the client's cultural and personal framework.
2. Objects and Their Properties:
   • Tools: Reusable implements used to perform an activity (e.g., scissors, hammer, toothbrush).
   • Supplies / Materials: Consumable items that become depleted or transformed (e.g., shampoo, paper, eggs, thread).
   • Equipment: Larger non-consumable mechanical or electrical apparatuses (e.g., stove, washing machine, wheelchair).
   • Properties: Inherent traits of objects (e.g., heavy, slippery, sharp, flexible, fragile, hot).
3. Space Demands: Physical environmental requirements including floor area, surface height, lighting level, acoustic control, temperature, and ventilation.
4. Social Demands: Social norms, communication rules, spatial proximity expectations, and emotional behavioral boundaries inherent in shared activities.
5. Sequencing and Timing: Specific chronological steps, pacing, rhythm, and task duration.
6. Required Actions and Performance Skills: The observable, goal-directed motor, process, and social interaction skills executed during the task.
7. Underlying Body Functions & Structures: Physiological and anatomical requirements (e.g., active shoulder flexion to 120°, saccadic eye movements, short-term working memory, cardiopulmonary endurance).

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Therapeutic Intervention Mechanisms: Grading vs. Adapting

                    ┌──────────────────────────────────────────────┐
                    │          THERAPEUTIC TASK MODIFICATION       │
                    └──────────────────────┬───────────────────────┘
                                           │
                ┌──────────────────────────┴──────────────────────────┐
                │                                                     │
                ▼                                                     ▼
┌────────────────────────────────────────┐  ┌────────────────────────────────────────┐
│         GRADING (Remediation)          │  │         ADAPTING (Compensation)        │
├────────────────────────────────────────┤  ├────────────────────────────────────────┤
│ * Purpose: Restore or improve impaired │  │ * Purpose: Enable immediate function   │
│   body functions and performance skills│    despite persistent underlying deficits │
│ * Method: Systematically changing the │  │ * Method: Modifying the task method,   │
│   difficulty/challenge of the activity │    tools, or physical environment         │
│ * Direction: Grade UP (increase        │  │ * Target: Bypass the impairment rather │
│   challenge) or Grade DOWN (reduce)    │    than remediate it                      │
│ * Example: Moving target items higher  │  │ * Example: Using a long-handled reacher│
│   to demand greater shoulder flexion   │    and sock aid to dress independently    │
└────────────────────────────────────────┘  └────────────────────────────────────────┘

Practical Clinical Application of Grading and Adapting

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Standardized Home Safety Assessments

Evaluating the living environment is critical for fall prevention and promoting community independence:

+-----------------------------------------------------------------------------------+
|                       HOME SAFETY ASSESSMENT INSTRUMENTS                          |
|                                                                                   |
|  1. SAFER-HOME (Safety Assessment of Function and the Environment for Rehab)      |
|     * 74 items across 12 domains (Living space, mobility, kitchen, eating, etc.) |
|     * Assesses client's ability to safely carry out daily activities in the home  |
|     * Rating: 4-point scale (No problem, Mild, Moderate, Severe safety risk)      |
|                                                                                   |
|  2. HSSAT (Home Safety Self-Assessment Tool), Version 5                           |
|     * Checklist covering 65+ hazards across 10 home areas                          |
|     * Emphasizes client and caregiver self-identification of structural hazards   |
|                                                                                   |
|  3. Westmead Home Safety Assessment (WeHSA)                                       |
|     * 72-item standardized occupational therapy environmental checklist           |
|     * Focuses specifically on fall hazards for community-dwelling older adults   |
+-----------------------------------------------------------------------------------+

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ADA Architectural Accessibility Guidelines

The Americans with Disabilities Act (ADA) Accessibility Guidelines establish precise physical dimensions required for wheelchair and mobility device accessibility. These numerical standards are heavily tested on the NBCOT exam:

                        ADA ARCHITECTURAL CLEARANCES

       DOORWAY CLEAR OPENING                       RAMP SLOPE RATIO
          ┌──────────────┐                       ▲
          │  ◄── 32" ──► │                       │  1" Vertical Rise
          │   (Minimum)  │                       ▼  ════════════════════════►
          │              │                          ◄───── 12" Run ─────►
          │              │                          (Maximum 1:12 Slope)
          │              │
          └──────────────┘                    RAMP MINIMUM CLEAR WIDTH: 36"


       WHEELCHAIR TURNING RADIUS                   GRAB BAR MOUNTING HEIGHT
          ┌──────────────┐                       ▲
          │  ╭────────╮  │                       │  33" - 36"
          │ ╭┤ 60" DIA├╮ │                       │  from finished floor
          │  ╰────────╯  │                       ▼
          └──────────────┘                    ──────────────────────────────
        (60" Full 360° Circle)                       Finished Floor

Comprehensive ADA Measurement Reference Table

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Workplace Ergonomic Hazard Assessments

Ergonomics matches workplace demands to human physiological capacity to prevent Work-Related Musculoskeletal Disorders (WMSDs).

Primary Ergonomic Risk Factors:

1. Repetition: High cycle frequency without adequate recovery time (e.g., assembly line, keyboarding).
2. Awkward or Sustained Postures: Non-neutral joint angles (e.g., neck flexion $>20^\circ$, wrist extension $>15^\circ$, overhead reaching).
3. Forceful Exertions: Heavy lifting, pushing, pulling, or pinching.
4. Contact Stress: Localized pressure on soft tissue (e.g., resting wrists on sharp desk edges).
5. Vibration: Segmental (pneumatic tools causing Raynaud's/Vibration White Finger) or whole-body (driving heavy machinery).

+-----------------------------------------------------------------------------------+
|                       ERGONOMIC DESK WORKSTATION SETUP                            |
|                                                                                   |
|  * Monitor Distance: Arm's length (20–28 inches)                                  |
|  * Monitor Height:   Top of screen at or slightly below eye level (15-20° gaze)   |
|  * Elbow Angle:      90° to 100° with forearms parallel to floor                  |
|  * Wrist Position:   Neutral (avoid resting wrists on desk edges while typing)    |
|  * Hip / Knee Angle: 90° with feet flat on floor or supported by angled footrest  |
|  * Lumbar Support:   Conforming to natural lordotic curve of lower back           |
+-----------------------------------------------------------------------------------+

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Compensation Patterns, Context, and Current Conditions

Domain 1 Task 3 asks for the personal and environmental factors that facilitate or inhibit task completion, and the outline names three examples in order: compensation patterns, the role of performance context, and the influence of current conditions. Activity analysis is not finished when you record whether the task was completed. You must record how it was completed, where, and under what conditions — because all three change the answer.

Reading Compensation Patterns

A compensation pattern is a substitute movement or strategy the client uses to complete a task when the typical method is unavailable. A client who completes the task using a compensation is not the same as a client who completes it normally, and scoring them identically hides the deficit.

The clinical judgment the exam tests is that not every compensation is a problem. Separate them:

• Adaptive compensation to preserve and reinforce — tenodesis grasp, one-handed dressing technique, scanning for hemianopia.
• Maladaptive compensation to address — trunk lean masking reach loss, shoulder hiking, synergy-driven circumduction — because each one produces overuse injury, blocks motor recovery, or conceals a deficit that will resurface in a different context.

The Role of Performance Context

The same client is a different performer in different contexts. A client who dresses independently sitting on a firm, height-adjustable hospital bed with a rail may be dependent on a low, soft bed at home with no rail. Performance observed in the clinic is a hypothesis about home performance, not a measurement of it — which is why the outline treats context as a factor in its own right and why discharge recommendations are built on the projected discharge environment, not the treatment setting.

The Influence of Current Conditions

Performance also moves with the client's condition across the day:

• Medication timing. A client with Parkinson disease assessed at 9 a.m. during the levodopa on phase may look independent and be unable to perform the identical task at 3 p.m. during an off period.
• Fatigue. Endurance-limited clients (multiple sclerosis, cardiopulmonary disease, cancer-related fatigue) perform best on the first trial; a single observation over-estimates function.
• Pain. Morning stiffness in rheumatoid arthritis makes an early observation the worst-case reading, not the typical one.

The exam-safe response to any of these is the same: observe at more than one time point, or document the specific condition under which performance was measured.