Programming eccentric overload and deceleration work for injury prevention, return-to-performance, and athletic development.

The majority of non-contact injuries in team sports occur during deceleration: hamstring strains during sprinting, ACL tears during cutting, ankle injuries during landing. These are all eccentric-dominant events where the muscle is absorbing force while lengthening. Athletes who are eccentrically weak relative to their concentric strength are at higher injury risk.

Eccentric training has strong evidence behind it for injury risk reduction, particularly in hamstring injury prevention (Nordic curl protocols are the most studied example). The challenge for performance coaches has always been practical delivery — traditional eccentric methods are awkward, require partners, or need specialised machines. VOLTRA I makes eccentric overload programmable and precise.

In Weight Training Mode, tap the settings icon and toggle Eccentric. You can set the eccentric load as a percentage above the concentric load (e.g., +20% means the lowering phase is 20% heavier than the lifting phase) or as an absolute value in pounds.

This is a genuinely useful feature for coaches because it eliminates the logistics of eccentric training:

The flip side of eccentric overload is concentric-only training — zero resistance on the return phase. This is useful in two scenarios:

Deceleration training using VOLTRA I typically involves movements where the athlete resists the cable's pull during the eccentric phase of a dynamic movement. Examples:

Resisted sprint deceleration — Athlete sprints away from VOLTRA I (cable at hip level via belt/harness). The cable provides resistance during acceleration, then the athlete decelerates against the cable tension on the return. The eccentric overload setting can increase the deceleration demand beyond what the sprint phase produces.

Lateral deceleration — Cable attached at hip level, athlete moves laterally. The return phase (decelerating back toward the device) is eccentrically loaded. Directly relevant for cutting sports like football, basketball, rugby, and hockey.

Landing-based deceleration — Cable attached from a low mount, athlete performs squat jumps or broad jumps. Damper Mode can provide velocity-dependent resistance during the landing phase, training the same deceleration mechanics that cause injury in competition.

A 4-week supplementary eccentric block that can run alongside a standard strength program:

Week 1: Introduction. Weight Training Mode, standard settings (no eccentric overload). 3 sessions. Familiarise athletes with the cable feel on key movements: cable RDL, cable hamstring curl, cable lateral lunge. 3 × 8–10 reps per exercise, moderate load.

Week 2: Low eccentric overload. Enable +10% eccentric on the same movements. Same volume (3 × 8–10). Athletes should notice the difference on the lowering phase. Monitor for excessive DOMS — this is the adaptation phase.

Week 3: Moderate eccentric overload. Increase to +20% eccentric. Reduce volume to 3 × 6–8 to manage fatigue. Add one deceleration-specific exercise (e.g., resisted lateral shuffle with eccentric emphasis).

Week 4: Peak eccentric exposure. +25% eccentric on primary movements. 3 × 5–6 reps. Full deceleration protocol with 2–3 exercises. This is the highest demand week — schedule it away from competition or high-intensity field sessions.

Follow this block with a deload week before returning to standard programming. The eccentric adaptations (increased fascicle length, improved deceleration capacity) persist for several weeks after the training block ends.