{"actors":["Sprinters in one training group","Sprint coach responsible for technical feedback","Sport scientist responsible for biomechanical analysis","Data steward for authorized video and timing records"],"affected_objective":"Choose where along a sprint-acceleration trial to direct a technical cue, without treating gradual biomechanical change as arbitrary named phases or overlooking a localized departure hidden inside a coarse split.","arm":"ORDINARY_DIVERSE_P2","authority_safety":{"authorized_first_step":"The sport scientist may retrospectively re-express already-authorized sprint video and timing records in shadow mode; the resulting profiles cannot change live coaching or training plans during the evaluation.","decision_authority":"The sprint coach retains authority over technical feedback and training design, while each athlete retains authority to stop or decline any drill; the sport scientist controls only the shadow analysis.","excluded_actions":["Automatic generation or delivery of athlete cues","Changing training volume, intensity, selection, or competition entry","Inferring injury, diagnosis, or medical clearance","Collecting new video, sensor, or biometric data without existing consent and governance approval","Ranking athletes for contracts, discipline, or compensation","Interpolating across missing frames, camera failures, slips, or visibly interrupted trials"],"halt_rollback":"Stop if consent or retention authority is absent, calibration cannot support the stated resolution, identifiable footage cannot be protected, or shadow outputs begin influencing live coaching; quarantine derived profiles and revert evaluation records to the existing split-and-phase review."},"baseline":"The bounded coaching workflow summarizes acceleration using fixed distance splits and named phases such as drive, transition, and upright running. Technical observations are attached to those bins or phases, so variation inside a segment and uncertainty about internal phase boundaries are not represented explicitly.","candidate_id":"discrete_continuous_model_selection__sport_science__ORDINARY_DIVERSE_P2","causal_chain":["The decision is limited to locating an interval for a possible acceleration-technique cue within an otherwise completed sprint trial.","Center-of-mass velocity and trunk-angle change are represented as continuous functions of distance because the decision concerns gradients, curvature, and localized departures rather than membership in a named phase.","Start and finish are retained as explicit trial boundaries, while no internal drive-to-transition boundary is imposed.","Removing internal phase bins prevents adjacent observations from receiving discontinuously different interpretations solely because they fall on opposite sides of a coaching label.","Distance-aligned sampling preserves within-split changes that a single split time or phase average cannot display.","Smoothing strength is constrained by measurement resolution and tested against held-out frames so the profile does not imply unsupported precision.","Trials containing a slip, obstruction, missing interval, or other visible discontinuity are flagged as outside the continuity assumption rather than absorbed into the curve.","Blinded comparison with the existing split-and-phase representation tests whether reviewers can locate and justify cue intervals consistently without losing decision-relevant discontinuities."],"cell_id":"discrete_continuous_model_selection__sport_science","consequence":"Fixed splits and named acceleration phases can create artificial technique boundaries and conceal within-segment gradients, while excessive smoothing can erase a brief departure or imply values unsupported by the recording; either error can direct feedback to the wrong portion of a trial.","diversity_from_prior_proposals":"This opportunity concerns spatial localization of within-trial sprint-technique feedback and replaces arbitrary internal phase segmentation with a bounded continuous biomechanical profile; it does not address athlete readiness, session modification, recovery trajectories, or escalation events.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Create a retrospective continuous-distance representation of selected acceleration trials using already-authorized calibrated video and timing records. Express center-of-mass velocity and trunk angle over normalized distance, show uncertainty and missing intervals, retain only the physical start and finish as required boundaries, and exclude visibly interrupted trials from continuous interpretation. In shadow mode, ask reviewers to identify any cue-worthy interval from the profile before seeing the existing fixed splits and named-phase annotations.","mechanism_mapping":[{"counterfactual_removal":"Without the continuous process model, gradual biomechanical change must be compressed into phase averages, split summaries, or isolated observations.","mechanism_slug":"continuous_process_model","role":"Represents velocity and trunk-angle development as distance-indexed curves for locating gradients and localized departures."},{"counterfactual_removal":"Without resolution alignment, the fitted curves could hide short changes or imply detail that the source video cannot support.","mechanism_slug":"sampling_interval_choice","role":"Sets the distance increment and smoothing scale from frame rate, calibration quality, and the minimum interval relevant to the cue-localization decision."},{"counterfactual_removal":"Without a resolution audit, arbitrary phase cliffs could merely be replaced by smoothing artifacts or unnoticed discontinuities.","mechanism_slug":"transition_resolution_audit","role":"Checks internal phase-boundary cases, held-out frames, missing intervals, visible interruptions, and sensitivity to smoothing choices."}],"nearest_rivals":["Fixed 10-meter split summaries with one technical note per split","Named drive-transition-upright phases with coach-assigned boundaries","Stride-by-stride categorical technique scores","Unstructured full-speed video review without a distance-aligned representation"],"negative_tests":{"intervention_falsifier":"Reject the continuous representation if blinded reviewers locate cue intervals less consistently than with the existing representation, if conclusions change materially across defensible smoothing settings, or if brief visible departures are repeatedly absorbed into fitted curves.","problem_falsifier":"The inferred problem is unsupported if internal phase boundaries are reproducible from the authorized records, within-phase variation never changes the cue-localization judgment, and continuous profiles yield no decision-relevant distinction beyond fixed splits and phase summaries.","risks":["Calibration error may appear as biomechanical change.","Distance normalization may obscure meaningful differences in trial duration.","Smoothing may erase brief departures or create artificial curvature.","Reviewers may overinterpret visually precise curves.","Excluding interrupted trials may narrow the usable evidence set.","Identifiable athlete video or derived movement data may be exposed or repurposed.","Additional analysis may increase staff burden without changing feedback decisions."],"strongest_counterevidence":"The strongest counterevidence would be independent reviewers assigning the same internal phase boundaries and cue locations from fixed splits and named phases, with continuous profiles adding no stable decision-relevant information and showing greater sensitivity to measurement or smoothing choices."},"next_evidence_step":"Select an already-authorized, de-identified set of completed acceleration trials from one training group. Pre-register eligible variables, physical trial boundaries, exclusion rules, distance resolution, and several defensible smoothing settings. Have two reviewers independently locate and justify possible cue intervals from continuous profiles and, separately, from fixed splits with named phases. Compare boundary disagreement, within-split cue localization, discontinuity exclusions, missing-data handling, and sensitivity to representation; make no operational coaching changes.","observable_state":"For each eligible trial, the shadow review displays normalized distance, measured and fitted velocity and trunk-angle values, uncertainty, held-out-frame residuals, missing intervals, physical start and finish boundaries, interruption flags, the reviewer-selected cue interval, and the corresponding fixed split and named-phase annotations revealed only after the independent judgment.","prior_art_status":"UNSEARCHED","problem":"Acceleration-technique review assigns observations to fixed distance splits and named phases even when posture and velocity evolve gradually across those boundaries. This false segmentation can hide localized within-split change and make cue placement depend on an analyst-defined phase edge rather than the recorded movement, while an unconstrained smooth curve could conceal genuine interruptions.","proposal_index":2,"remaining_contrastive_claim":"Conditional on eligible trials containing decision-relevant gradual change within fixed splits, a distance-indexed continuous profile with explicit physical boundaries, resolution limits, and interruption exclusions should support more representation-stable localization of possible cue intervals than fixed split or named-phase summaries; the bounded shadow comparison must determine whether this contrast remains.","revision_record":{"claim_changes":[],"conceptual_changes":[],"evidence_changes":[],"operational_changes":[],"parent_version":null,"progress_targets_addressed":["Generated an independent sport-science opportunity centered on within-trial biomechanical feedback localization.","Specified a continuous representation, continuity limits, falsifiers, safeguards, rival models, and a bounded shadow-mode evidence step."]},"schema_version":1,"structural_mapping":[{"archetype_element":"Decision Need","domain_realization":"Locate an interval within a completed acceleration trial where a coach could consider directing a technical cue."},{"archetype_element":"Process Change Signature","domain_realization":"Velocity and trunk angle may change as gradients across distance, while slips, obstructions, and recording gaps are discontinuities outside the proposed continuous interpretation."},{"archetype_element":"Granularity Choice","domain_realization":"Use continuous distance-indexed profiles at a resolution justified by the recording rather than fixed internal phases or one value per distance split."},{"archetype_element":"Step Boundary","domain_realization":"Treat the recorded movement start and finish as physical trial boundaries; do not impose an internal drive-to-transition boundary."},{"archetype_element":"Continuity Assumption","domain_realization":"Assume smooth change only within calibrated, observed intervals of an uninterrupted eligible trial."},{"archetype_element":"Measurement Resolution","domain_realization":"Choose the distance increment and smoothing scale from frame rate, calibration uncertainty, and the shortest interval relevant to cue localization."},{"archetype_element":"Transition Validation","domain_realization":"Compare fitted profiles with held-out frames and inspect whether visible localized departures remain detectable."},{"archetype_element":"Hybrid Boundary Rule","domain_realization":"A slip, obstruction, missing interval, or visible interruption ends continuous interpretation for that trial and routes it to ordinary event-based video review."},{"archetype_element":"Approximation Error Check","domain_realization":"Compare cue judgments lost inside split averages with departures lost or distorted under alternative continuous smoothing settings."},{"archetype_element":"Boundary Case Review","domain_realization":"Blindly reassess observations near existing split and named-phase edges to determine whether those edges alter interpretation without corresponding movement change."},{"archetype_element":"Reversibility Check","domain_realization":"Keep all profiles in shadow mode so they can be withdrawn without altering coaching, training, or source records."},{"archetype_element":"Scale Shift Review","domain_realization":"Reassess resolution and continuity assumptions before applying the representation to another sprint distance, camera setup, or movement task."}],"title":"Continuous Distance Profiles for Localizing Sprint-Acceleration Technique Feedback","version":0}