부하-속도 프로파일 가이드: 1RM 예측 & 훈련 최적화

The load-velocity profile (LVP) is the foundation of intelligent velocity-based training. It is the individualized relationship between the load on the bar and the speed at which you can move it. Once established, your LVP allows you to predict your 1RM on any given day, select training loads based on target velocities, and track long-term strength development — all without ever needing to test a true max.

Building an accurate LVP requires a specific testing protocol, consistent technique, and a reliable velocity measurement device. This guide walks through the entire process from preparation to interpretation, with practical examples and troubleshooting for common errors.

A load-velocity profile is a graph that plots external load (in kilograms or as a percentage of 1RM) on the x-axis against mean concentric velocity (in meters per second) on the y-axis. When you measure velocity across a range of loads for a given exercise, the data points form a nearly linear relationship: as load increases, velocity decreases in a predictable pattern.

This linear relationship was formalized in the scientific literature by Gonzalez-Badillo and Sanchez-Medina (2010), who demonstrated that the load-velocity relationship in the bench press was highly linear (R-squared values above 0.97) across trained lifters. Subsequent research confirmed similar linearity for the squat, deadlift, overhead press, and other compound movements.

The key properties of an LVP are:

• Slope — How steeply velocity declines as load increases. A steep slope indicates a more force-dominant athlete profile (strong but slower). A shallow slope indicates a more velocity-dominant profile (less absolute strength but faster at submaximal loads).
• Y-intercept (V0) — The theoretical velocity at zero load. This represents your maximal unloaded speed for the movement pattern.
• X-intercept (L0) — The theoretical load at zero velocity, closely approximating your 1RM. This is the basis for 1RM prediction.
• Minimum Velocity Threshold (MVT) — The lowest velocity at which you can successfully complete a rep. This is exercise-specific and relatively stable within an individual over time.

Every athlete has a unique LVP for each exercise they perform. Two lifters with identical 1RM values can have very different profiles if one is more fast-twitch dominant (shallower slope, higher velocities at submaximal loads) and the other is more slow-twitch dominant (steeper slope, lower velocities but can grind through maximal loads).

An individualized load-velocity profile unlocks several capabilities that transform how you train:

1. Non-maximal 1RM estimation

Traditional 1RM testing is fatiguing, carries injury risk, and provides only a snapshot that is immediately outdated. With an LVP, you can estimate your 1RM from submaximal warm-up velocities. Research by Jovanovic and Flanagan (2014) showed that LVP-based 1RM predictions are accurate within 2-6% of tested values when using 3 or more data points.

2. Daily load prescription

Your 1RM fluctuates daily by 10-18%. If your program calls for 80% of 1RM, what matters is 80% of your 1RM today, not 80% of a number you tested 6 weeks ago. Your LVP lets you identify today's 80% load by finding the weight that produces the velocity corresponding to 80% on your profile.

3. Training quality assessment

If you move a load faster than your profile predicts, you are in a state of elevated readiness and can potentially handle more volume or intensity. If you move it slower, you may be fatigued and should adjust accordingly.

4. Long-term progress tracking

As you get stronger, your entire LVP shifts: you can move the same absolute loads faster, and your predicted 1RM increases. Comparing profiles from month to month provides clear evidence of strength development, even before your tested 1RM catches up.

5. Exercise and athlete profiling

The slope of your LVP reveals your force-velocity characteristics. Athletes with steeper slopes (fast velocity decline per unit of load increase) tend to be more force-oriented. Athletes with shallower slopes tend to be more velocity-oriented. This information guides exercise selection and training emphasis. A force-dominant athlete may benefit from more speed-strength work, while a velocity-dominant athlete may need more maximal strength development.

An accurate LVP requires careful testing with consistent technique and maximal intent on every rep. Here is the complete protocol:

Pre-test requirements:

• You should be well-rested (no hard training in the preceding 48 hours).
• Standardize your warm-up: 5 minutes of general cardiovascular activity followed by dynamic stretching specific to the exercise being tested.
• Have your velocity sensor set up and calibrated according to device instructions.
• Know your approximate 1RM for the exercise (within 10% accuracy). If you have no idea, perform a conservative estimated 1RM test first on a separate day.

Testing procedure:

1. Load 1 (~40% estimated 1RM) — Perform 3 reps with maximal concentric intent. Record the mean velocity of the fastest rep. Rest 2 minutes.
2. Load 2 (~50% e1RM) — Perform 2 reps with maximal intent. Record the fastest. Rest 2 minutes.
3. Load 3 (~60% e1RM) — Perform 2 reps. Record. Rest 2 minutes.
4. Load 4 (~70% e1RM) — Perform 2 reps. Record. Rest 3 minutes.
5. Load 5 (~80% e1RM) — Perform 1-2 reps. Record. Rest 3 minutes.
6. Load 6 (~85-90% e1RM) — Perform 1 rep. Record. Rest 3-4 minutes.
7. Load 7 (~90-95% e1RM, optional) — Perform 1 rep only if you feel capable and the data requires a high-load data point. Record.

You need a minimum of 4 data points for a reliable profile, but 5-7 points with at least one above 85% produce the most accurate results.

Critical technical requirements:

• Maximal concentric intent — Every rep must be performed with the deliberate intention to move the bar as fast as possible. Without maximal intent, velocity data is meaningless.
• Consistent technique — Stance width, grip width, depth (for squat), pause (if applicable), and breathing must be identical across all loads. Any technique variation introduces noise into the data.
• No fatigue accumulation — Rest periods must be long enough that fatigue from previous sets does not reduce velocity at subsequent loads. If in doubt, rest longer. The test should take 20-30 minutes.
• Use the fastest rep — If performing multiple reps at a load, use the highest velocity value. This best represents your maximal capability at that load.

Recording your data:

Once you have collected your data, plot load (kg) on the x-axis and best mean velocity (m/s) on the y-axis. Fit a linear regression line through the data points. The resulting equation takes the form:

Velocity = slope x Load + intercept

Or equivalently: V = a x L + b

Using the example data from the testing protocol section, a linear regression might produce:

V = -0.0090 x L + 1.49

This tells us:

• Slope = -0.0090 — For every 1 kg increase in load, velocity decreases by 0.009 m/s.
• Y-intercept (V0) = 1.49 m/s — Theoretical maximal velocity at zero load.
• X-intercept (L0) — Setting V = 0: L0 = 1.49 / 0.0090 = 165.6 kg. This is the theoretical load at zero velocity.

R-squared value:

Your linear regression should produce an R-squared value above 0.95 for the profile to be reliable. Values below 0.95 suggest inconsistent technique, insufficient intent at some loads, or measurement error. If R-squared is low, retest with more careful attention to technique and intent.

Understanding your profile shape:

• Steep slope (e.g., -0.012) — You are force-dominant. You are relatively strong at high loads but lose velocity quickly as load increases. You may benefit from more speed-strength and ballistic training to develop the high-velocity end of your profile.
• Shallow slope (e.g., -0.007) — You are velocity-dominant. You move submaximal loads very fast but may lack peak force production. More maximal strength work (heavy squats, pulls above 85% 1RM) would help shift your profile.
• Average slope (e.g., -0.009 to -0.010) — A balanced force-velocity profile. Training should maintain both qualities through a varied program.

Comparing your slope across exercises also reveals exercise-specific strengths and weaknesses. A lifter might have a steep slope on the squat (strong but slow) and a shallow slope on the bench press (fast but relatively weaker). This information guides exercise prioritization and accessory selection.

The primary practical application of a load-velocity profile is predicting your one-repetition maximum without actually attempting one. This is done by combining your linear equation with your minimum velocity threshold (MVT).

Step-by-step 1RM prediction:

1. Establish your MVT — This is the velocity at which you successfully complete your heaviest possible single. For most trained lifters: squat MVT is approximately 0.20-0.30 m/s, bench press is approximately 0.10-0.17 m/s, deadlift is approximately 0.12-0.20 m/s. Ideally, test this once under controlled conditions.
2. Collect warm-up velocity data — On your training day, record velocity at 2-3 warm-up loads with maximal intent.
3. Fit the line — Using your 2-3 data points (or overlaying them on your existing profile), determine the linear equation for today.
4. Solve for load at MVT — Plug your MVT into the equation and solve for load. This is your estimated daily 1RM (e1RM).

Worked example:

A lifter performs warm-up singles on the squat:

• 100 kg at 0.68 m/s
• 120 kg at 0.52 m/s
• 135 kg at 0.40 m/s

Linear regression: V = -0.0080 x L + 1.48

The lifter's known squat MVT is 0.25 m/s.

Solving: 0.25 = -0.0080 x L + 1.48

L = (1.48 - 0.25) / 0.0080 = 153.8 kg

Estimated daily 1RM: approximately 154 kg.

If the program calls for 5 sets of 3 at 80% of 1RM, today's working weight is 154 x 0.80 = 123 kg.

Accuracy considerations:

• Number of data points — More is better. With 2 points, you can draw a line but have no way to verify linearity. With 3+ points, R-squared confirms reliability.
• Range of loads — Data points should span at least 30% of your 1RM range (e.g., from 50% to 80%). Extrapolating from two close loads (e.g., 60% and 65%) produces unstable predictions.
• Consistency of intent — If one warm-up rep is performed lazily, it will skew the regression. Every data-collection rep must be performed with maximal intent.
• Device accuracy — Your sensor must have measurement error below 0.02-0.03 m/s for the prediction to be meaningful. Higher sampling rates (800Hz vs 200Hz) improve accuracy.

Studies validating this approach report prediction errors of 2-6% compared to actual tested 1RM (Jovanovic & Flanagan, 2014; Garcia-Ramos et al., 2018). For a 150 kg squatter, this means the prediction is accurate to within 3-9 kg — precise enough for practical load prescription.

Your load-velocity profile is not static. It evolves as your strength, power, and neuromuscular efficiency change with training. Here is how to maintain and apply your profile over time.

When to retest your full profile:

• Every 4-6 weeks during a training cycle.
• After a significant deload or recovery period.
• When you suspect your strength has changed substantially (either improved or declined).
• At the start of a new training block or periodization phase.

Ongoing daily updates:

You do not need to perform a full profile test every session. Instead, record velocity at 2-3 warm-up loads each session and use the two-point or three-point method to estimate that day's profile. Over time, your database of load-velocity data points grows, and you can run regressions on the most recent 4-6 weeks of data for a rolling profile estimate.

Tracking profile shifts:

Compare your LVP from different testing dates to identify training effects:

• Rightward shift (same velocity at heavier loads) — You have gotten stronger. Your 1RM has increased. This is the primary goal of most strength programs.
• Upward shift (higher velocity at the same loads) — You have gotten faster. Your rate of force development and power have improved. This is particularly relevant for athletes in explosive sports.
• Slope change — If your slope has become shallower over time, you are developing more speed at submaximal loads. If steeper, you are developing more maximal strength relative to your speed. Neither is inherently better — it depends on your sport and training goals.

Applying your LVP in weekly training:

Common pitfalls when maintaining your LVP:

• Comparing different exercises — Each exercise has its own profile. Never use squat velocities to prescribe bench press loads.
• Ignoring technique changes — If you change your squat stance or bench grip width, your profile changes. Retest after any significant technique modification.
• Stale profiles — A profile more than 8 weeks old is unreliable for athletes making rapid progress. Keep it current.
• Environmental factors — Equipment differences (bar whip, platform surface, rack height) can affect velocity measurements. Test and train with consistent equipment when possible.