Use case
Injury prevention: detect load spikes before they turn into a risk
Avoidable injuries in youth football rarely come down to bad luck — they come from undetected load spikes. KAIZEA gives every player a daily wellness check-in and automatically calculates the Load Index as a traffic light (green/amber/red) — so you detect load spikes before they turn into a risk. No hardware, no spreadsheets.
The problem
Why do overuse injuries seem to come out of nowhere?
Because load spikes stay invisible without systematic measurement — until the player is already injured. Amateur coaches rarely have access to the data that would show this risk early.
Overload stays invisible
Without ongoing measurement, a critical load spike usually only shows up once the player is already injured on the bench.
No systematic measurement in amateur football
GPS systems cost thousands of euros per season, and manually maintained spreadsheets rarely get updated consistently in practice.
The injury seems to come out of nowhere
Tournament blocks, training breaks, and growth spurts change a young player's load without anyone measuring it.
Psychological load stays out of the picture
Stress, sleep deprivation, and low motivation additionally raise injury risk, according to Ivarsson et al. (2017) — but only if someone asks about them.
How it works
How does KAIZEA detect load spikes?
KAIZEA automatically combines two signals into your Load Index: session RPE — exertion (1–10) × training duration — and the daily wellness check-in. When the value crosses the configured threshold, the load traffic light flags the player automatically — before the load turns into a risk.
- RPE entry after every session: 10 seconds on the phone, no hardware required
- Daily wellness check-in: about 30 seconds, often flags early warning signs before the load traffic light does
- Automatic flagging: players in the yellow or red zone are marked, push notification for critical values
Load traffic light
Kevin M. · this week
- train fully
- reduce load
- rest
Load trend · last 7 days
The player's load trend across the last 7 days, showing a visible spike before rest
What you get
What does KAIZEA show you day to day?
Three building blocks that together form a complete early warning system — without you having to evaluate anything yourself.
Load traffic light
A color-coded zone per player — green, amber, red — calculated automatically from session RPE and attendance, optionally enriched with wellness or wearable data.
Wellness early warning
The daily wellness check-in tracks sleep, muscle soreness, stress, mood, nutrition, and energy — warning signs often show up here before the load traffic light itself changes.
Auto-flagging
At-risk players are flagged automatically and reported via push notification — no more manually working through spreadsheets.
These three building blocks rest on published sports science: the sweet spot between 0.8 and 1.3 marks the lowest injury risk, according to Gabbett (British Journal of Sports Medicine, 2016); keeping the weekly load increase under 10 % lowers it further (Gabbett, 2016). The so-called training–injury prevention paradox shows that high but progressively built chronic load is actually more protective than sudden spikes (Gabbett, 2016). The underlying session-RPE method is validated as a hardware-free measurement approach (Foster et al., Journal of Strength and Conditioning Research, 2001). Targeted prevention exercises add further protection: a meta-analysis of 8,459 athletes found that Nordic hamstring exercises reduce hamstring injury rates by roughly 51 % (van Dyk, Behan & Whiteley, British Journal of Sports Medicine, 2019) — exercises like these are available in the KAIZEA drill library.
Frequently asked questions
What is the Load Index and why does it matter for injury prevention?
The Load Index compares the training load of the last 7 days with the average of the last 28 days. Values between 0.8 and 1.3 are considered the sweet spot with the lowest injury risk; above that, risk rises significantly (Gabbett, British Journal of Sports Medicine, 2016). KAIZEA calculates the Load Index automatically from players' RPE and wellness inputs and displays it as a load traffic light.
Do I need hardware to detect load spikes?
No. KAIZEA works entirely on RPE (Rating of Perceived Exertion) — validated per Foster et al. (Journal of Strength and Conditioning Research, 2001). Players enter their perceived exertion after each session, which takes 10 seconds and requires no GPS trackers or heart rate sensors.
Can KAIZEA prevent injuries?
No — no software can guarantee the prevention of injuries. KAIZEA detects load spikes before they turn into a risk, and automatically flags at-risk players. Whether and how you respond as a coach is up to you.
Does the load traffic light work for youth teams too?
Yes. KAIZEA calculates with youth-adjusted time constants instead of applying pro formulas unchanged to children. Parents with the appropriate permissions can view their child's data.
Do targeted exercises further reduce injury risk?
Yes. A meta-analysis of 8,459 athletes found that Nordic hamstring exercises reduce hamstring injury rates by roughly 51% (van Dyk, Behan & Whiteley, British Journal of Sports Medicine, 2019). Exercises like these are available in the KAIZEA drill library.
More: Training load & the Load Index · Wellness monitoring · ACWR fundamentals
Last updated: July 2026
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