Tendon Loading Volume Calculator
Calculate the optimal eccentric and isometric load for your golfer's elbow rehab — phase by phase, session by session.
Input your rehabilitation phase, exercise type, pain response, and current load to get evidence-based targets for session volume and next-session progression. All data stored locally — no account needed.
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Target: pain ≤4/10 during exercise. Pain >5/10 = load too high.
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What is tendon loading volume — and why does it matter?
For decades, the standard advice for golfer's elbow was rest. We now know this is counterproductive. Tendons need mechanical stimulus — specifically, appropriately dosed compressive and tensile load — to drive collagen remodelling and restore tensile strength to the flexor-pronator origin. Too little load and the tendon stays reactive; too much and it becomes more irritable. The art of rehab is finding the dose.
Tendon loading volume — calculated as sets × reps × load (kg) — gives you a single number that represents the mechanical stimulus delivered to the common flexor origin in one session. Tracking volume over time lets you see whether you are progressing appropriately, holding steady, or inadvertently overloading.
The continuum model
Cook & Purdam's tendon pathology continuum (2009) describes three stages: reactive tendinopathy (acute overload, short-term), tendon disrepair (failed healing attempt), and degenerative tendinopathy (focal cell death, long-standing). Each stage needs a different loading approach — isometrics first, eccentrics second, heavy slow resistance third. Getting the phase right before increasing volume is critical.
Heavy slow resistance (HSR)
Kongsgaard et al. (2009) showed heavy slow resistance training outperformed eccentric-only protocols at 6 months in patellar tendinopathy — and the structural superiority persisted at one year. HSR uses slow tempo (3-1-3 or 3-0-3) at high loads (70–85% of pain-free maximum) for 3–4 sets of 6–10 reps, every other day. This calculator applies HSR targets for the Conditioning and Strength phases.
Isometrics in the acute phase
Rio et al. (2015) demonstrated that isometric contractions at 70% of maximal voluntary contraction for 5 × 45 seconds produce immediate analgesia in reactive tendons — pain during and after the hold is often lower than before. In the acute phase (weeks 0–2), isometrics provide load without the through-range movement that provokes reactive flares. The calculator recommends isometric targets when you select the Acute / Reactive phase.
The 24-hour rule
The most reliable sign of correct loading is the 24-hour pain response. If pain after a session returns to your pre-session baseline within 24 hours, the dose was appropriate. If pain is higher the next morning than before you trained, the load was too high. Pain during exercise ≤4/10 NRS is the widely-used upper threshold during the loading phase — the calculator flags sessions above this limit with amber or red.
Phase-by-phase load targets
The following targets are derived from published heavy slow resistance protocols adapted for the flexor-pronator origin. Use them as a starting point — individual pain response overrides all thresholds.
| Phase | Exercise type | Sets × Reps | Typical load | Tempo | Frequency |
|---|---|---|---|---|---|
| Acute (0–2 wk) | Isometric wrist flexion | 5 × 45 s | 60–70% MVC | Static hold | Daily |
| Early Rehab (2–6 wk) | Eccentric wrist flexion | 3 × 12–15 | 2–4 kg | 1-0-3 | Every other day |
| Conditioning (6–10 wk) | HSR wrist curl | 3–4 × 8–10 | 4–7 kg | 3-1-1 | Every other day |
| Strength (10–14 wk) | HSR wrist curl + pronation | 4 × 6–8 | 7–12 kg | 3-1-1 | Every other day |
| Sport-Proofing (14+ wk) | HSR + energy storage drills | 3 × 8 + drills | 10–15 kg | 3-0-1 | Every other day |
Adapted from Kongsgaard et al. (2009), Cook & Purdam (2009), and Alfredson eccentric loading protocol. MVC = maximal voluntary contraction. Tempo format: concentric-pause-eccentric (seconds).
How to use this calculator
Choose the rehab phase that matches your current week in recovery. If unsure, start at Acute / Reactive and advance only when resting pain is ≤2/10 and your 24-hour response is neutral. The phase determines whether the calculator applies isometric, eccentric, or HSR load targets.
After completing a set, enter the exercise type, the actual weight used, how many sets and reps you completed, and your pain during exercise on the 0–10 NRS. Estimate if you didn't track exactly — the trend matters more than any single data point.
The calculator grades your session green, amber, or red based on pain response and whether your volume is within phase-appropriate ranges. Green means proceed as planned; amber means hold or reduce 10%; red means drop load by 20–30% and rest tomorrow. Check the 24-hour rule the next morning — your morning stiffness and pain level is the true verdict.
Log every session. Over 4–6 weeks, you should see volume climb while pain scores trend down or stay stable. A rising pain trend with flat volume often signals occupational or sleep factors, not training error. For automated load tracking tied to your morning traffic-light check-in, Golf Elbow Oracle handles this natively — including offline use.
Related rehab concepts
Progressive overload
Increase load by 5–10% per session only when pain stays ≤4/10 and the 24-hour response is neutral. Never progress on a red day. The smallest increment that drives adaptation is ideal — rounding up to the nearest 0.5 kg dumbbell is enough.
Eccentric-only vs HSR
Pure eccentric protocols (Alfredson) lower the weight slowly with the injured arm and lift it back with the healthy arm. HSR includes the concentric phase, which means higher total volume for the same number of reps. Both work — HSR has stronger long-term evidence at 12 months.
Tempo and time-under-tension
Slow tempo (3-1-3) maximises time-under-tension and reduces ballistic stress on the tendon. A set of 8 reps at 3-1-3 tempo takes ~56 seconds — more than twice as long as a fast gym set. The metronome in Golf Elbow Oracle counts every rep to keep tempo consistent.
Exercise frequency
Tendon loading protocols use every-other-day (3–4 sessions/week) rather than daily loading, because tendons take 36–48 hours to respond to a loading stimulus. Daily loading (except isometrics in the acute phase) risks accumulating microdamage faster than the tendon can repair it.
FAQ
What is tendon loading volume in golfer's elbow rehab?
Tendon loading volume is the total mechanical stimulus applied to the flexor-pronator tendon in a session, calculated as sets × reps × load (kg). For medial epicondylitis, research shows the tendon needs sufficient load to drive collagen remodelling — but not so much that it re-provokes reactive tendinopathy. This calculator helps you find that dose.
How much load is safe for eccentric wrist flexion with golfer's elbow?
Kongsgaard et al. (2009) showed heavy slow resistance outperforms eccentric-only protocols when load is titrated to pain response. In the acute phase, 2–3 kg for wrist flexion eccentrics is typical. By the strength phase, 6–10 kg is appropriate. Pain during exercise should stay ≤4/10 NRS; pain >24 hours post-session signals too much load.
Is my session data sent to a server?
No. All session logs are stored exclusively in your browser's localStorage under the key geo-tendonload-v1. Nothing is transmitted to any server. Clearing your browser storage will erase your history.
What does the traffic light output mean?
Green means your current load and pain response are within safe parameters — proceed as planned. Amber means borderline: consider reducing load by 10–15% next session. Red means your pain level or volume is too high — drop load by 20–30% and reassess tomorrow.
When should I switch from isometrics to eccentric loading?
The transition from isometrics to eccentric loading is appropriate when resting pain is ≤3/10 and isometrics do not provoke pain above 4/10 during the hold. Most people transition at 2–4 weeks. The calculator's Acute/Reactive phase selection applies isometric load targets; selecting Early Rehab or beyond applies HSR targets.
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Let the app calibrate your load automatically
Golf Elbow Oracle reads your morning traffic-light check-in and adjusts today's eccentric load, tempo, and volume — no manual calculation needed.