QOOM
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Ready assessmentGait

Treadmill Walking

Walking gait at a controlled speed.

17
metrics
1
gradable today
8
events detected
Start an assessmentMetric reference
What this test measures

What it tests, what QOOM measures, what you get

What it tests
Walking gait at a controlled speed.
What QOOM measures
Cadence, step length and width, gait symmetry index, trunk flexion, hip extension at toe-off, peak hip adduction, knee flexion at initial contact and in stance, foot progression angle.
What you get
Gait-cycle timeline, left-versus-right symmetry chart and metric zones.
How it is captured

The protocol

Two phones on tripods, stereo-calibrated once. The protocol below is the one the analysis pipeline is written against.

Subject walks on a treadmill at a self-selected or prescribed speed. Capture must include at least 6 full gait cycles within the steady-state window. A warm-up period of >= 30 s at target speed is recommended before capture.

Category
Gait
Environment
Treadmill
Trial structure
Continuous cycles
Minimum capture
10 s

Camera setup guide

Events detected

The moments the analysis finds first

Every metric is measured between events. These are detected from the reconstructed skeleton before any metric is computed.

  1. 1

    Trial Start

    trial_start

    First frame of the captured trial.

  2. 2

    Steady-State Start

    steady_state_start

    First frame of the identified steady-state walking window (acceleration artifacts excluded).

  3. 3

    Steady-State End

    steady_state_end

    Last frame of the steady-state walking window.

  4. 4

    Trial End

    trial_end

    Last frame of the captured trial.

  5. 5

    L Initial Contact

    left_initial_contact_{n}Per repetition

    Frame of left foot initial contact (heel strike) for cycle n.

  6. 6

    L Toe-Off

    left_toe_off_{n}Per repetition

    Frame of left foot toe-off for cycle n.

  7. 7

    R Initial Contact

    right_initial_contact_{n}Per repetition

    Frame of right foot initial contact for cycle n.

  8. 8

    R Toe-Off

    right_toe_off_{n}Per repetition

    Frame of right foot toe-off for cycle n.

Every metric

The full metric list

This is the complete list the analysis produces for this assessment — the same list the metric reference documents. A metric with a reference distribution shows the direction that reads as better and the evidence level behind it; where the evidence gate withholds the zone, the reason is shown instead of a grade.

  • Cadencespm
    cadence_spm
    Zone withheld — source not resolved to a specific paperevidence: unvalidated

    Steps per minute averaged over the steady-state window.

  • COM Excursionm
    com_excursion_m
    No reference distribution

    Mean vertical displacement of the COM per gait cycle. Vertical oscillation of the centre of mass while walking.

  • Step Widthm
    step_width_m
    No reference distribution

    Mean medio-lateral distance between consecutive foot placements.

  • Step Length (est.)m
    step_length_est_m
    No reference distribution

    Estimated step length from gait-cycle timing and treadmill speed.

  • Step Symmetry%
    symmetry_index_percent
    Zone withheld — source describes a different population, task or measureevidence: consensus

    Symmetry index between left and right step times. 100% = perfect symmetry.

  • Mean Trunk Flexion°
    mean_trunk_flexion_deg
    target rangeevidence: approximate

    Average trunk flexion angle during the steady-state window.

  • Hip Extension at TO°
    hip_extension_at_to_degPer side
    No reference distribution

    Hip extension angle at toe-off. Describes terminal-stance hip posture.

  • Peak Hip Adduction°
    peak_hip_adduction_degPer side
    No reference distribution

    Maximum hip adduction during stance. A frontal-plane hip control marker.

  • Peak Knee Flexion (Stance)°
    peak_knee_flexion_stance_degPer side
    Zone withheld — a provenance trace found no sourceevidence: approximate

    Maximum knee flexion during stance phase. Knee yield during the loading-response phase of stance.

  • Knee Flexion at IC°
    knee_flexion_at_ic_degPer side
    No reference distribution

    Knee flexion angle at initial contact. Sagittal knee posture at foot strike.

  • Foot Progression Angle°
    foot_progression_angle_degPer side
    No reference distribution

    Angle of foot relative to direction of progression. Toe-in vs toe-out.

  • Pelvis Vertical Excursionm
    pelvis_vert_excursion_m
    No reference distribution

    Trial-aggregate range of vertical pelvis-COM motion. Indexes how much the centre of mass rises and falls relative to the support base.

  • Pelvis Lateral Excursionm
    pelvis_lateral_excursion_m
    No reference distribution

    Trial-aggregate range of medio-lateral pelvis-COM motion. Quantifies side-to-side sway, including during single-leg stance.

  • Pelvis Forward Excursionm
    pelvis_forward_excursion_m
    No reference distribution

    Trial-aggregate range of anterior-posterior pelvis-COM motion. Forward progression in gait; forward travel and braking depth in jumps.

  • Pelvis Vertical Excursion (SD)m
    pelvis_vert_excursion_sd_m
    No reference distribution

    Cross-cycle (or cross-rep) standard deviation of vertical pelvis-COM excursion. Higher SD signals movement variability.

  • Pelvis Lateral Excursion (SD)m
    pelvis_lateral_excursion_sd_m
    No reference distribution

    Cross-cycle standard deviation of lateral pelvis-COM excursion. Used as a stability marker for repeated gait/jump tasks.

  • Pelvis Forward Excursion (SD)m
    pelvis_forward_excursion_sd_m
    No reference distribution

    Cross-cycle standard deviation of forward pelvis-COM excursion. Used as a stability marker for repeated gait/jump tasks.

What the report contains

Sections of the report

The per-trial report is assembled from these sections, in this order.

  1. 1

    Key Metrics

    Headline gait metrics.

  2. 2

    Metric Zone Overview

    All metrics as gradient zone bars.

  3. 3

    Gait Cycle Events

    Gait-cycle timeline with IC and TO events for both sides.

  4. 4

    Symmetry Analysis

    Left vs right comparison chart for key per-side metrics.

  5. 5

    Joint Kinematics

    4-panel grid through gait cycles.

  6. 6

    Description of Metrics

    Full-text description of every metric in the report and what each one measures.

  7. 7

    Quality Assurance

    QA verdict, reasons, warnings, schema version, report hash.

Quality checks

What can stop a result

Each trial is checked before metrics are reported. A failed check either blocks the result or marks it partial — it is never silently graded.

  • Mean pose-estimation confidence across trial must be >= 0.60

    min_pose_confidence
    Blocked

  • No contiguous occlusion > 0.5 s on key landmarks (hip, knee, ankle)

    no_major_occlusion
    Partial

  • At least 6 complete gait cycles must be detected in steady-state window

    gait_min_cycles
    Partial

  • Steady-state window must be >= 5 seconds

    gait_steady_state
    Blocked

  • Cadence must be between 60 and 200 spm (plausibility check)

    gait_cadence_range
    Blocked
Blocked —
No metrics are reported for the trial.
Partial —
Metrics are reported with a warning; the affected values are flagged.
How grading is decided

When a metric gets a zone

A metric can be graded only when the norms registry holds a reference distribution for it, and a zone is shown only when the evidence gate admits that distribution’s provenance and evidence level. A distribution the gate refuses stays in the registry, auditable, with no zone.

1 of 17 metrics can be graded today

4 carry a reference distribution · 3 zones withheld by the evidence gate: 1 × source not resolved to a specific paper, 1 × source describes a different population, task or measure, 1 × a provenance trace found no source

Evidence levels behind this assessment’s reference distributions

  • published0

    Values traceable to a peer-reviewed population study. Reserved; nothing in the registry currently qualifies.

  • consensus1

    Anchored to a recognised clinical guideline or expert-consensus cutoff. Values are approximate, but the cutoff is citable.

  • approximate2

    Informal literature ranges or general-adult estimates, not validated against a specific cohort. The honest default.

  • unvalidated1

    A two-point estimate or an inferred value. A distribution is declared, but the evidence gate withholds the zone.

How the evidence gate worksFull metric reference

Run this assessment.

Two phones, one guided protocol, and a report at the end.

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