Nexus Integration Domain 02 & 10

High-Performance Isokinetic Testing | Multi-Sport Elite Profiling

Establishing pre-season baseline neuromuscular capacity profiles, tracking longitudinal adaptations across training blocks, and mitigating injury risk in elite professional sport.

Pre-Season Baseline Profiling Across Elite Sports

In elite athletic environments, pre-season isokinetic testing establishes individual normative baselines for peak torque, H:Q ratios, length-tension curves, and bilateral limb symmetry. Should an injury occur during the competitive season, clearance is benchmarked against the athlete's own uninjured baseline rather than generic population averages.

Multi-Sport Performance Profiling Applications

01 — FOOTBALL (SOCCER)

Premier League, EFL, WSL, League of Ireland & PSL

Profiling eccentric hamstring strength (Hecc:Qcon≥ 1.0) at 240°/s to mitigate hamstring strain injuries during maximal acceleration/deceleration, and adductor-to-abductor torque ratios (ADD:ABD) for groin strain risk management.

02 — RUGBY UNION & LEAGUE

Premiership, URC & Springboks

Quantifying trunk extensor/flexor work capacity (RUPWE protocol: 6,000 J at 10°/s) to evaluate core muscular endurance under scrum compressive loads, alongside quadriceps eccentric braking capacity for collision absorption.

03 — GAELIC FOOTBALL & HURLING

GAA Inter-County & Club

Addressing high annual ACL injury incidence across Gaelic games. Testing quadriceps and hamstring peak torque symmetry (LSI > 90%) and dynamic hamstring deceleration capacity to protect the knee joint during high-speed cutting and single-leg landing.

04 — TENNIS & CRICKET

ATP/WTA, ECB & Cricket SA

Testing shoulder internal/external rotation torque ratios (ERecc:IRcon≥ 1.0) for overhead service deceleration in tennis, fast-bowling lumbar work capacity in cricket, and rotator cuff balance.

05 — ATHLETICS & SPRINTING

UK Athletics & ASA South Africa

Measuring explosive Rate of Force Development (RFD) and Time to Peak Torque (< 150 ms) across high angular velocities (240°/s to 300°/s) to optimize terminal swing phase hamstring eccentric braking during top-speed sprinting.

06 — NETBALL & COURT SPORTS

Netball Superleague & Basketball

Evaluating eccentric quadriceps braking capacity and ankle inversion/eversion balance to protect female athletes against sudden foot-plant deceleration ACL injuries and recurrent lateral ankle instability.

THE JUST KINETICS NEXUS INTEGRATION MODEL™

10-Domain Integrated Performance Architecture

Human performance cannot be collapsed into an isolated testing tool or a simplistic 4-step chain. The Just Kinetics Nexus Integration Model™ establishes 10 distinct, measurable integration domains—placing Isokinetic Mechanical Capacity (Domain 02) precisely within a complete biological and performance continuum.

Core Integration FormulaStructure + Capacity + Control + Expression = Demand + Context
DOMAIN 01 — STRUCTUREBiological & Mechanical Stability
“Is the biological/mechanical structure sufficiently intact and stable?”

Evaluating ligamentous laxity, joint structural integrity, post-surgical graft healing, and passive mechanical restraint.

Evidence: Dyneelax automated ACL laximetry, clinical drawer/Lachman exams, structural imaging
DOMAIN 02 — CAPACITY / MECHANICALIsoforce / Isokinetics
“What can the joint produce, absorb and sustain under controlled velocity conditions?”

Isolated dynamic muscle torque, peak torque/BW, work capacity (Joules), power output, fatigue index (%), and dynamic H:Q ratios.

Evidence: Isoforce accommodates torque across velocity spectrum (60°/s to 300°/s), length-tension curves
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DOMAIN 03 — SENSORIMOTOR (CONTROL)Neuromuscular Regulation
“Can force and position be controlled appropriately by the nervous system?”

Evaluating postural balance, proprioceptive acuity, unilateral motor regulation, and spinal reflex responses under perturbation.

Evidence: Unilateral postural stability, sway index, sensorimotor control batteries
DOMAIN 04 — EXPRESSIONForce Platforms / ForceDecks
“How is available capacity expressed through functional ground force dynamics?”

Multi-joint ground reaction forces, rate of force development (RFD), countermovement jump impulse, and eccentric braking absorption.

Evidence: ForceDecks vertical jump impulse, braking RFD, dynamic landing asymmetry (%)
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DOMAIN 05 — MOVEMENTVideo / Motion Analysis
“How is force expression organized and coordinated in multi-joint motion?”

Kinematic alignment, dynamic knee valgus angles, trunk inclination, joint angular velocities, and intersegmental coordination strategy.

Evidence: 2D/3D motion capture, joint kinematic sequencing, movement quality scoring
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DOMAIN 06 — FUNCTIONTask Performance Execution
“Can the athlete execute the relevant multi-planar sporting task?”

Evaluating functional execution across jumping, single-leg landing, deceleration, sprinting, and change of direction (COD).

Evidence: Field jump tests, 10m/30m sprint splits, COD speed tests, deceleration braking grids
DOMAIN 07 — DEMANDGPS & Match Analysis
“What does the sport and position actually require in competition?”

Quantifying external game demands: high-speed running (HSR) thresholds, sprinting distance, acceleration/deceleration volume, and collisions.

Evidence: GPS locomotor tracking, match video analysis, mechanical load profiles
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DOMAIN 08 — EXPOSURETraining Load Accumulation
“Has the athlete accumulated sufficient exposure to those external demands?”

Establishing dose, frequency, and load progression. Demand specifies what the game requires; Exposure verifies what dose the athlete has completed.

Evidence: HSR exposure dose, max velocity sprint volume, cumulative COD repetition progression
DOMAIN 09 — RESPONSEBiological & Performance Reaction
“How did the biological system tolerate and respond to that exposure dose?”

Measuring post-load symptoms, fatigue accumulation, recovery readiness, muscle soreness, and biological load tolerance.

Evidence: Post-training soreness, neuromuscular readiness, readiness surveys, post-match markers
DOMAIN 10 — LONGITUDINAL INTEGRATIONTrajectory Across Time
“Is the trajectory stable and progressing across time, rather than a single testing point?”

Tracking longitudinal trends, baseline comparisons, acute-to-chronic ratios, and multi-test trajectories across weeks and seasons.

Evidence: Nexus longitudinal profiles, repeated test trends, multi-modal baseline tracking
CRITICAL SCIENTIFIC PRINCIPLE: DEMAND ≠ EXPOSURE ≠ RESPONSE

Why Demand, Exposure, and Response Are Three Separate Constructs

1. DEMAND (GPS/Video)

Establishes: “The competitive environment requires X.” (High-speed running volume, sprint frequency, deceleration density).

2. EXPOSURE (Dose/Progression)

Establishes: “The athlete has actually experienced X, at what dose, frequency, and progression?”

3. RESPONSE (Biological Tolerance)

Establishes: “What happened when we exposed the athlete to X?” (Neuromuscular fatigue, symptoms, recovery rate).

The Goal of Integration is NOT to Force Agreement Between Tests: An athlete can possess intact structure (Domain 01), high isokinetic torque capacity (Domain 02), and strong CMJ force expression (Domain 04), yet fail under high-speed deceleration exposure (Domain 08) due to unconditioned braking tolerance. Discordance across domains yields vital clinical decision intelligence.

Isokinetics = Domain 02 (Controlled Mechanical Capacity)
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