Walk into most gyms and the implicit measure of progress is the 1RM. How much can you squat? What's your deadlift? The one-rep maximum has become the default proxy for strength — and while it's not without value, treating it as the primary indicator of strength development is a mistake that costs athletes real performance gains.
The 1RM tells you one thing: the maximum force your neuromuscular system can produce under a slow, maximal-effort contraction against a near-maximal load. That's it. It tells you nothing about how quickly that force can be expressed — and in almost every athletic context, speed of force production matters far more than its ceiling.
What Is Rate of Force Development?
Rate of force development (RFD) is exactly what it sounds like: the speed at which force is produced from the onset of muscle contraction. It is typically measured as the slope of the force-time curve in the early phase of a contraction — often assessed in the first 50–200 milliseconds.
Why does that window matter? Because most athletic actions — a sprint start, a change of direction, a jump, a tackle — are completed or decided in under 200 milliseconds. The ground contact time during sprinting is roughly 80–120ms. A defensive reaction to a tennis serve happens in around 150ms. In these timeframes, the body cannot reach its maximum force output. What determines performance is how much force can be produced before that window closes.
Aagaard et al. (2002) demonstrated this clearly, showing that early-phase RFD (the first 30–100ms of contraction) is largely determined by neural drive — specifically the rate and synchronisation of motor unit firing — rather than by maximal strength per se. You can have a substantial 1RM and still have poor early RFD if your nervous system hasn't been trained to fire fast.
The Force-Velocity Relationship
To understand why 1RM and RFD are not the same quality, it helps to look at the force-velocity curve. This fundamental relationship in muscle physiology describes the inverse relationship between the speed of a contraction and the force it can produce: as velocity increases, force decreases, and vice versa.
Maximal strength — the quality your 1RM reflects — sits at the far left of the curve: high force, near-zero velocity. Explosive power and RFD sit toward the right: high velocity, lower absolute force. These are not opposing qualities, but they are distinct ones. Training exclusively at the maximal-strength end of the spectrum improves force production at slow velocities. It does not automatically transfer to high-velocity force expression.
This is the gap that trips up a lot of lifters. They see their squat go up, they assume their athleticism is improving, and they're often surprised when sprint times, jump height, or on-field explosive qualities don't keep pace. The strength is there. The capacity to access it quickly isn't.
The Research on RFD and Sport Performance
The evidence linking RFD to athletic performance is substantial and consistent. Tillin and Folland (2013) conducted a widely cited review examining the importance of explosive strength — including RFD — for sport performance, concluding that early-phase RFD is one of the most important neuromuscular qualities for athletes, and that it responds differently to training than maximal strength.
Their work highlighted that RFD is particularly sensitive to neural adaptations: increases in motor unit firing rate, improved motor unit synchronisation, and enhanced inter-muscular coordination. These adaptations don't come from heavy, slow grinding sets. They come from training that demands rapid force expression.
Aagaard et al. have also shown that heavy strength training can increase late-phase RFD (after 150ms) by increasing the overall force potential — essentially raising the ceiling the curve climbs toward. But early-phase RFD, the window that actually governs most athletic actions, requires ballistic and high-velocity loading to improve meaningfully.
The implication: a well-designed programme for an athlete needs both. But measuring only 1RM and calling it "strength development" is like measuring only top speed and calling it a complete picture of running ability.
Why a High 1RM With Poor RFD Falls Short
Consider two athletes. Athlete A squats 180kg but moves slowly through the entire range — grinding, deliberate, effortful. Athlete B squats 150kg but moves with intent, accelerates through the lift, and competes in a sport requiring explosive ground contact.
By the 1RM metric alone, Athlete A is stronger. In almost any athletic context, Athlete B likely has the more useful quality. Their nervous system has been trained to produce force fast, not just to produce a lot of it eventually.
This isn't to dismiss heavy loading — maximal strength sets the upper boundary of what's available. A weak athlete cannot be explosive. But strength is a necessary condition for athletic power, not a sufficient one. Once a baseline of maximal strength is established, the marginal return from adding more 1RM pales compared to developing the capacity to access that strength quickly.
What Actually Improves RFD
If RFD is primarily a neural quality — and the evidence strongly suggests it is — then improving it requires training that directly challenges the nervous system's ability to produce rapid, high-frequency motor unit recruitment. That means:
- Ballistic and plyometric training: Jumps, bounds, medicine ball throws, and Olympic lifting derivatives demand high-velocity force expression and directly target early-phase RFD.
- Intent-driven lifting: Lifting submaximal loads with maximal acceleration intent — attempting to move the bar as fast as possible even under moderate load — recruits fast-twitch fibres and trains the neural patterns associated with RFD without the fatigue of maximal loading.
- Speed-strength work: Loading in the 30–70% of 1RM range at high velocity, often called the speed-strength zone, targets the right-hand side of the force-velocity curve where power output is maximised.
- Contrast methods: Pairing a heavy strength exercise with a biomechanically similar explosive movement (e.g., heavy squat followed by a depth jump) exploits post-activation potentiation to acutely enhance RFD expression.
Maximal strength training still has a role — it maintains and develops the force ceiling. But if your entire programme is built around hitting new 1RMs, you are systematically neglecting the quality that most determines what your strength is worth in motion.
The Practical Takeaway
Stop using your 1RM as the sole marker of progress. It's one data point — useful, but incomplete. A more complete picture of strength development includes how fast force is produced, how well it transfers to the movement patterns that matter to you, and how that quality holds up under competition-specific conditions.
If you're training for athletic performance, the question isn't just "how much can you lift?" It's "how fast can you produce force, and is your programme actually building that quality?" For most lifters, the honest answer is that they've optimised for one half of the equation and largely ignored the other.
If you want a programme that builds both — one designed around what you actually need to express, not just what looks good on a testing day — book a free consultation and we'll build something that actually transfers.