117 lines
7.7 KiB
Markdown
117 lines
7.7 KiB
Markdown
# Exercise and equipment interpretation
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Scientific knowledge is keyed to existing stable exercise and equipment
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identities. Display labels are identification clues. They are not anatomical
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proof, runtime classification rules or grounds for merging identities.
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`catalog/exercise-knowledge-v1.json` separates reviewed interpretations from
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conditional candidates; `catalog/equipment-knowledge-v1.json` describes
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physical apparatus and its exercise capabilities.
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The reviewed inventory contains 23 exercise identities and 41 equipment
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identities: 38 supplied definitions and three durable custom entries. No
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manufacturer or model has been confirmed for the local apparatus. Available
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manufacturer examples remain examples; their ratios, trajectories and outcome
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claims are not transferred to the local inventory.
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## Reviewed exercise families
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The following are biomechanical interpretations using the stated execution.
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They are qualitative classifications, not measurements of individual force
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contributions. Anatomy and the references linked below support the rationale.
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| Actual catalog exercise | Interpretation | Existing primary / secondary BODY ZONES | Main qualification |
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| Abdominal crunch | Resisted spinal flexion; rectus and obliques | core | Confirm that movement is not predominantly hip flexion |
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| Arm curl | Elbow flexion; biceps, brachialis and brachioradialis | arms | Grip and shoulder support change participation |
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| Back extension | Spinal extension; erector spinae and multifidus | back / core | Pelvic restraint determines hip involvement |
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| Converging Shoulder Press | Overhead push; deltoids with elbow extension | shoulders / arms | Plane, seat support and scapular freedom unresolved |
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| Diverged seated row; Seated row | Horizontal pull; humeral extension and scapular retraction | back / arms | Elbow path determines lat/scapular/posterior-deltoid emphasis |
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| Diverging lat pulldown; Lat pull | Vertical pull; shoulder adduction/extension and elbow flexion | back / arms | Grip and linkage do not establish regional isolation |
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| Hip abduction | Abduction involving medius/minimus and other abductors | glutes | Tensor fasciae latae and superior maximus contributions vary |
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| Hip adduction | Resisted thigh approximation by hip adductors | thighs | Hip and knee angles affect individual muscles |
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| Leg extension | Resisted knee extension by quadriceps | thighs | Rectus femoris also crosses hip |
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| Leg press | Combined knee/hip extension | thighs / glutes | Machine, depth and foot placement alter moments |
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| Prone leg curl | Knee flexion with prone support | thighs | Distinct length context from seated curl |
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| Seated Leg; Seated leg curl | Knee flexion with seated support | thighs | Two existing identities retained; common family does not merge IDs |
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| Rear Delt | Reverse fly: humeral horizontal abduction with scapular contribution | shoulders / back | Distinct from Pec Fly on the same device |
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| Rotary torso | Relative thorax-pelvis rotation; paired oblique action | core | Compatible supplied equipment is not proven occurrence linkage |
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Chest Press priority is addressed through a complete **conditional** anterior
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press interpretation: pectoralis major as a primary mover, anterior deltoid and
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triceps as synergists, shoulder horizontal adduction with elbow extension,
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and `horizontal_push`. The custom `Chest press` and `Converting chest press`
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identities have not independently established that execution. Their retained
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chest/shoulders/arms relations are plausible historical mappings; the scientific
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candidate stays uncertain until apparatus and motion are confirmed.
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[NIH pectoralis anatomy](https://www.ncbi.nlm.nih.gov/books/NBK525991/),
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[OpenStax upper-limb anatomy](https://openstax.org/books/anatomy-and-physiology-2e/pages/11-5-muscles-of-the-pectoral-girdle-and-upper-limbs)
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The custom `Abdominal` entry similarly retains a conditional crunch candidate,
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not an asserted execution. Both generic warm-up identities remain unresolved.
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`Marche` has a conditional walking interpretation; a continuous/duration profile
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and an aggregate treadmill inventory do not establish all execution details or
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a specific occurrence association. Unknown new custom exercises remain
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unclassified until evidence is added explicitly.
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Seated versus prone curl has direct longitudinal evidence: the studied seated
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condition produced greater growth of biarticular hamstrings. This supports
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retaining length context while avoiding a universal machine or outcome ranking.
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[Maeo and colleagues](https://pubmed.ncbi.nlm.nih.gov/33009197/)
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The leg-press review concerns EMG. It supports quadriceps involvement but does
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not establish a robust universal foot-placement recipe or prove that hamstring
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coactivation replaces knee-flexion training.
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[Martín-Fuentes and colleagues](https://pubmed.ncbi.nlm.nih.gov/32605065/)
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Reverse pec-deck and row/pulldown investigations concern selected EMG tasks.
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They corroborate plausible posterior-deltoid and scapular contributions without
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ranking long-term growth. Divergent/convergent machine labels add no independent
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outcome evidence.
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[Franke and colleagues](https://pubmed.ncbi.nlm.nih.gov/24947920/),
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[Lehman and colleagues](https://pubmed.ncbi.nlm.nih.gov/15228624/)
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Pelvic stabilization changes lumbar-extensor excitation. A Back Extension
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execution dominated by hip motion may deserve different muscle roles from the
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spinal-extension interpretation; that decision requires actual geometry and
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execution evidence.
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[Lee](https://pubmed.ncbi.nlm.nih.gov/26730390/)
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## Multifunction and unrestricted equipment
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A Rear Delt / Pec Fly device supports at least two distinct tasks. Rear Delt
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uses shoulder horizontal abduction and a shoulder/back projection. Pec Fly
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uses horizontal adduction, with a chest emphasis and possible anterior-deltoid
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assistance. Pec Fly has no verified local exercise ID. It remains an unlinked
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capability, not a fabricated catalog exercise.
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The assistance device likewise supports separate assisted dip and assisted
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chin/pull-up capabilities. Neither has a verified local exercise ID. The
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legacy `assisted_dip` and `assisted_chin` strings in the equipment manifest are
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not creator exercise identities. Chin-up and pronated pull-up also require
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specific grip/execution context. Manufacturer catalogs demonstrate that such
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combination products exist, not that these examples identify the local model.
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[Life Fitness equipment catalogue](https://www.lifefitness.com.au/wp-content/uploads/2024/02/Life-Fitness-Catalogue_2024_web.pdf)
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Functional trainers, adjustable pulleys, dumbbells, kettlebells, bags,
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medicine balls and suspension straps require the actual exercise. Their
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presence cannot establish a primary BODY ZONE. Cable height and routing,
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attachment, stance and line of pull determine the task. A documented example
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with a 4:1 cable ratio illustrates why local ratios must be verified separately.
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[Precor RUD0915](https://www.precor.com/en-US/products/RUD0915)
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Benches and guided squat machines require support and movement details. Cardio
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apparatus requires mode, speed/cadence, resistance and support context. A rowing
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ergometer includes a leg/trunk/arm cycle and is not the same exercise as a
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seated resistance row. Battle ropes have mass and inertia: their existing
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`bodyweight` catalog category is retained as legacy metadata, not a calibrated
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physical load model. Any future vocabulary change needs a separate explicit
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compatibility decision.
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## BODY ZONE audit result
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No reviewed finding justifies an automatic persisted-zone change. Existing
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assignments are compatible with the identified families or remain conditional
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where observation is missing. Additional potential synergists are documented
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at muscle level. A future correction must state its evidence, affected stable
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identities and explicit migration separately; enrichment never silently
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rewrites historical mappings.
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