운동 능력 파워 테스트: CMJ, 멀리뛰기 & 메디신볼

Athletic power — the ability to produce force rapidly — is arguably the most important physical quality in sport. Power determines how high you jump, how fast you sprint, how far you throw, and how hard you hit. Unlike maximal strength, which can be developed relatively slowly, power requires the nervous system to recruit motor units quickly and coordinate complex multi-joint movements at high velocities.

Testing athletic power serves multiple purposes: establishing baselines, tracking training adaptations, identifying strengths and weaknesses, monitoring fatigue, and informing return-to-play decisions. This guide covers the essential power tests every athlete and coach should know, with standardized protocols and interpretation guidelines.

Performance Prediction

Power tests are among the strongest predictors of athletic performance. Countermovement jump (CMJ) height correlates with sprint speed (r = 0.70-0.85), change-of-direction ability (r = 0.55-0.70), and on-field performance metrics across multiple sports. Athletes who test well on power assessments consistently outperform those who don't.

Training Monitoring

Regular power testing reveals whether your training program is working. A well-designed strength and conditioning program should produce measurable increases in power output over 8-12 week training blocks. If power metrics plateau or decline, it signals that programming adjustments are needed.

Fatigue Detection

Power output is highly sensitive to neuromuscular fatigue. A decline of >5% in CMJ height from an athlete's established baseline is a reliable indicator of accumulated fatigue that may require load reduction or recovery intervention. This makes power testing an invaluable daily readiness monitoring tool.

Asymmetry Assessment

Bilateral power tests can reveal between-limb asymmetries that increase injury risk. A >15% difference in single-leg hop distance or single-leg CMJ height warrants investigation and targeted training intervention, particularly in ACL injury prevention contexts.

Countermovement Jump (CMJ)

The CMJ is the most widely used and researched power test in sport science. It assesses the stretch-shortening cycle and provides insights into both force production and movement strategy.

Protocol:

1. Stand with feet hip-width apart, hands on hips (for standardization)
2. Perform a rapid downward countermovement to approximately 90° knee flexion
3. Immediately jump as high as possible
4. Land softly with knees bent
5. Perform 3-5 trials with 30-60 seconds rest between jumps
6. Record the best trial

Key metrics: Jump height (cm), peak power (W), peak velocity (m/s), flight time (ms), contraction time (ms).

Squat Jump (SJ)

The squat jump isolates concentric power by eliminating the stretch-shortening cycle. Start from a static squat position (90° knee angle), pause for 2-3 seconds, then jump maximally.

The CMJ-to-SJ ratio (Eccentric Utilization Ratio) reveals how well an athlete uses elastic energy: ratios below 1.05 suggest poor reactive ability and may indicate a need for plyometric training.

Drop Jump / Reactive Strength Index

Drop jumps assess reactive strength — the ability to rapidly absorb and redirect force. Step off a box (30-40cm), land on both feet, and immediately jump as high as possible while minimizing ground contact time.

RSI = Jump Height / Ground Contact Time

RSI values above 2.0 indicate excellent reactive strength. Values below 1.0 in trained athletes suggest a need for plyometric development.

Standing Broad Jump

The broad jump assesses horizontal power production, which is critical for acceleration and many sport-specific movements. It requires less equipment than most other power tests and can be performed anywhere with a flat surface.

Protocol: Stand with toes behind a line, swing arms, and jump as far forward as possible. Measure from the start line to the nearest point of contact on landing. Best of 3 trials.

Normative data (adult males): Below average: <200cm, Average: 200-230cm, Good: 230-260cm, Excellent: >260cm.

Single-Leg Hop Tests

The single-leg hop test battery is the gold standard for return-to-sport assessment after ACL reconstruction. It includes:

• Single hop for distance: One maximal hop on one leg, land and stabilize
• Triple hop for distance: Three consecutive single-leg hops
• Crossover hop for distance: Three hops crossing back and forth over a line
• 6-meter timed hop: Hop on one leg for 6m as fast as possible

Calculate the Limb Symmetry Index (LSI): (injured side / uninjured side) × 100. An LSI >90% on all four tests is typically required for return-to-sport clearance.

Medicine Ball Chest Pass

Using a 3-5kg medicine ball, perform a two-handed chest pass for maximum distance from a seated position (to isolate upper body). Measure throw distance. Best of 3 trials. This test correlates with bench press power and is relevant for throwing and pushing sports.

Medicine Ball Overhead Throw

Standing with feet shoulder-width apart, perform a soccer-style overhead throw backward over the head for maximum distance. This tests total body power through a posterior chain-dominant movement pattern. Use a 3-4kg medicine ball.

Medicine Ball Rotational Throw

Stand sideways to a wall, rotate and throw a 3-4kg medicine ball as hard as possible into the wall from hip height. Measure throw velocity or distance. This is the most sport-specific upper body power test for rotational athletes (baseball, golf, tennis, combat sports).

Bench Press Throw / Velocity

For athletes with access to VBT devices, monitoring bench press bar velocity at standardized loads (e.g., 50% 1RM) provides a sensitive measure of upper body power output that can be tracked longitudinally without maximal effort testing.

Raw test scores are useful, but intelligent interpretation requires context:

Individual Baseline Comparison

The most meaningful comparison is always to the athlete's own baseline. A CMJ height of 45cm means very different things for a 100kg rugby prop versus a 70kg sprinter. Track individual trends over time rather than comparing to population norms.

Meaningful Change Thresholds

Not every change in test score represents a real adaptation. Account for measurement error by establishing the Smallest Worthwhile Change (SWC) for each test:

• CMJ height: SWC ≈ 1.0-1.5cm (CV ≈ 3-5%)
• Broad jump: SWC ≈ 4-6cm (CV ≈ 3-4%)
• Medicine ball throw: SWC ≈ 0.2-0.3m (CV ≈ 4-6%)

Force-Velocity Profiling

Advanced interpretation combines multiple tests to build a force-velocity profile. Athletes who jump high relative to their sprint speed are "force-dominant" and may benefit from high-velocity training. Athletes who sprint fast relative to their jump height are "velocity-dominant" and may benefit from heavy strength training.

When to Test

• Comprehensive battery: Every 8-12 weeks (aligned with training block transitions)
• CMJ monitoring: Weekly or even daily for fatigue management
• Pre/post training block: Before and after focused training phases
• Return-to-sport: As part of clearance criteria after injury

Standardization Checklist

• Same time of day (±1 hour)
• Same warm-up protocol (5 min cardio + dynamic stretching + 3 practice jumps)
• Same footwear and surface
• Same rest intervals between trials
• Minimum 48 hours after intense training
• Well-hydrated and fed (no fasted testing)

Consistency in testing conditions is more important than the specific test you choose. A test performed inconsistently provides no useful information regardless of how sophisticated it is.