You have about 200 milliseconds
Catch your toe on a curb and here's what happens. Your body has roughly two-tenths of a second to get force into the ground before the fall is decided.
A maximal voluntary contraction (1RM) takes longer than that to develop.
Which means the number everybody trains and tests - how much you can lift - is irrelevant to the event most likely to end your independence.
From the Bench
New this year in Mayo Clinic Proceedings. Araújo and colleagues followed 3,889 adults aged 46 to 75 for a median of nearly eleven years, and asked a question nobody had answered directly: which predicts death better, muscle strength or muscle power?
Strength is how much force. Power is force times velocity - how much, how fast.
Comparing the weakest quartile to the strongest, relative power carried a hazard ratio of 6.90 in women. Relative strength carried 1.71 — and it wasn't statistically significant once the other variables were accounted for.
Read that again. In this cohort, once you controlled for everything else, strength stopped predicting survival and power kept predicting it.
Power also improved predictive accuracy significantly over strength alone.
The Take
Here's the physiology underneath it.
Rate of force development - how fast you can climb the force curve - declines on a steeper trajectory than maximal strength does. Aging takes the top of the curve before it takes the area underneath. Type II fibers atrophy preferentially. Motor unit discharge rates drop.
So a 68-year-old can hold a respectable deadlift number and have quietly lost the thing that actually catches them. The 1RM is the slow-moving variable. It's the last one to go, which makes it the worst one to monitor.
And the trip-recovery work maps directly onto that 200-millisecond window: in older adults, a reduced rate of muscle activation is associated with impaired balance recovery during tripping, and reduced RFD tracks with worse postural stability. Not reduced strength. Reduced rate.
The good news is that this is the trainable part. Lifelong strength-trained older adults show maximal motor unit discharge rates roughly 25% higher than untrained people the same age — the decline is largely a use-it-or-lose-it problem, and explosive work is what preserves it.
Which means the prescription isn't heavier. It's faster.
And faster doesn't have to mean serious.
The most reactive years of your life happened before you were twelve. Dodging, chasing, catching things thrown badly at you. Nobody was counting sets. You weren't training reaction time - you were playing, and the adaptation came along for the ride.
You don't need a sled or a hurdle to get this back. You need something unpredictable and permission to laugh at it. Start small - this is not the place to go hard on day one. But don't be afraid to have fun with it, either. That's not a consolation prize. It's the actual mechanism.
On the Desk
Adding low-grade plyometrics to every master’s client's warm-up - pogo hops, drop-and-stick, medicine ball throws. A systematic review of randomized trials in adults aged 60+ found plyometric training to be feasible and safe.
Bringing back change-of-direction work. Reactive, unpredictable, externally paced - the kind of movement adults stop doing entirely around 40.
On that note: open-skill exercise (tennis, table tennis, anything where you respond to something you didn't choose) shows better reaction-time and executive-function outcomes than closed-skill work. The evidence here is cognitive, not fall-related - but reaction speed is the input to that 200-millisecond window.
Adults should still play. Turns out there's a mechanism - and it's the only part of this you'll actually look forward to.
The CTA:
There's a whole category of reactive work that looks nothing like training and does the job anyway. Low impact, low intimidation, genuinely fun. Most of my clients are surprised by how hard they're breathing and how much they're laughing at the same time.
Book an alignment call — and ask me about balloon games.
- Coach Cash AJ "Cash" Cacioppo, MS, CSCS, TSAC-F, USAW-L2 Founder, HTK Method HTK Method · no-bullshit human care
P.S. The last issue argued that bone only responds to high-magnitude load at high rates. Same variable, different tissue. That's not a coincidence - it's how the whole system is built.
Araújo CGS, Kunutsor SK, Eijsvogels TMH, et al. Muscle Power Versus Strength as a Predictor of Mortality in Middle-Aged and Older Men and Women. Mayo Clin Proc. 2025. doi:10.1016/j.mayocp.2025.01.006
Maffiuletti NA, Aagaard P, Blazevich AJ, Folland J, Tillin N, Duchateau J. Rate of force development: physiological and methodological considerations. Eur J Appl Physiol. 2016;116(6):1091–1116. doi:10.1007/s00421-016-3346-6
Vetrovsky T, Steffl M, Stastny P, Tufano JJ. The Efficacy and Safety of Lower-Limb Plyometric Training in Older Adults: A Systematic Review. Sports Med. 2019;49(1):113–131.
Balachandran AT, Steele J, Angielczyk D, et al. Power Training vs Traditional Strength Training and Physical Function in Older Adults: A Systematic Review and Meta-analysis. JAMA Netw Open. 2022;5(8):e2227870.
Gu Q, Zou L, Loprinzi PD, Quan M, Huang T. Effects of Open Versus Closed Skill Exercise on Cognitive Function: A Systematic Review. Front Psychol. 2019;10:1707.