Training: Mobiliteit en stretchen

This meta-analysis pooled randomized controlled trials of the main injury-prevention strategies. Stretching produced no significant reduction in injury rate. Strength training was the standout, cutting injuries to under a third of the control rate (relative risk about 0.315); pooled across all strategies, overuse injuries were roughly halved and acute injuries cut by about a third, with proprioception and multi-component programs also helping. The result is consistent with earlier reviews finding that stretching does not change injury risk, which is why the long-standing advice to stretch in order to avoid getting hurt is being revised.

Pooling 104 studies of static stretching applied right before a maximal test, the review found strength down about 5.4%, power about 1.9%, and explosive performance about 2.0%. The size of the loss scaled with the duration of the hold; stretches of roughly 45 seconds or less produced trivial or no impairment. This is the pre-workout re-examination: the habit of long static stretching just before a hard effort works against that effort, which is why a movement-based warm-up has replaced it before sport and lifting.

This meta-analysis of 77 studies of chronic stretch training found a moderate, consistent increase in range of motion. Static stretching and proprioceptive neuromuscular facilitation (PNF) produced greater gains than ballistic or dynamic stretching, and women gained more than men. The volume, intensity and frequency of stretching did not clearly change the long-term outcome, so more is not obviously better. This is the flexibility gain stretching delivers, separate from the injury and soreness claims that do not hold up.

This review sorted acute stretching studies by how long each stretch was held. Below about 60 seconds per muscle the effect on maximal strength and power was trivial or absent; at 60 seconds and above the performance cost emerged and grew. Read alongside the pre-workout strength-loss finding, the practical message is about duration and placement, not a blanket ban on ever stretching before you move.

This review of dynamic stretching, controlled movements taken through the range, not held, found it raises range of motion while avoiding the strength and power loss associated with pre-exercise static stretching. Several studies showed a small improvement in the strength, power or sprint performance that came right after. The effect is modest and inconsistent across the literature, and it depends on the movements being brisk and specific to the task, but the direction and the contrast with static stretching are consistent.

This meta-analysis compared resistance training performed through a full range of motion with partial-range training. Full-range work produced greater gains, with clear advantages for muscle strength and lower-limb muscle growth. This is the mobility case for lifting well: training the whole range keeps the range usable and strong, not treating flexibility as a separate chore bolted on afterwards.

This meta-analysis of 55 trials found that chronic resistance training increased range of motion with a moderate effect (effect size 0.73), and that the gain was statistically no different from what stretching produced (a between-groups effect size of 0.08). Untrained people improved the most. The effect held for training with external load, not body weight alone. The practical upshot revises the old assumption that flexibility requires a dedicated stretching routine: for many people, lifting through a full range delivers the flexibility as a by-product.

Prompted by animal work and a few very-long-duration human trials, this meta-analysis of 25 studies tested whether static stretching grows muscle. The overall effect was trivial (standardized mean difference 0.118), with a larger response only at long single-session holds beyond normal practice, and the flexibility gains people made did not correlate with any muscle growth. So while stretching clearly improves range of motion, the idea that it is a route to bigger muscles is not supported at the durations people actually use.

The Cochrane review pooled controlled studies of stretching applied around exercise and measured muscle soreness in the following days. The reduction in soreness was very small, well below the threshold that a person would notice, whether the stretching was done before exercise, after it, or both. This is the second half of the received belief being revised: stretching neither prevents injury nor takes the ache out of the days after hard effort.

This randomized trial compared a plantar-fascia-specific stretch with a standard Achilles-tendon (calf) stretch in people with chronic plantar heel pain. The tissue-specific stretch produced greater improvements in pain and function. The lesson generalizes: stretching earns its keep most clearly when it targets a specific, identified restriction, such as a tight calf limiting the ankle or a stiff hip narrowing the stride, and less as an all-purpose habit applied everywhere.

This review examined what actually changes when range of motion improves with stretching. The weight of evidence favored increased stretch tolerance, a change in how the stretch is sensed, over a lasting increase in muscle length or a change in passive tissue stiffness. Because the adaptation is largely sensory, the gains are not permanent structural changes, and they recede once the stimulus is removed. This explains both why flexibility builds fairly quickly and why it fades without maintenance.

This large Cochrane review graded the evidence for different exercise types in preventing falls among community-dwelling older adults. Balance and functional exercise carried high-certainty evidence of a reduction in the rate of falls, and Tai Chi also reduced falls. Flexibility exercise did not have the evidence to be counted as an effective fall-prevention approach. Stretching does no harm here; it simply should not stand in for the balance-focused training that lowers fall risk.