Archers' muscles and manual therapy: Studnicki 2026

The same group of twenty Polish archers as the 2024 study, measured this time with a handheld myotonometer rather than electromyography. The device taps the resting muscle mechanically and derives five passive properties from the response: tone, stiffness, elasticity, relaxation time and creep. Measurements were taken at four points, at baseline, after 50 arrows, after 100 arrows and after a 30-minute rest followed by a manual therapy session, on six muscles of the bow arm: posterior deltoid, upper and lower trapezius, infraspinatus, extensor digitorum and flexor carpi ulnaris.

The main result is an absence. Neither 50 nor 100 arrows appreciably changed any of the five properties in any of the six muscles. At the end of the session two values for the flexor carpi ulnaris came out lower: tone fell from 18.5 to 17.1 hertz (p = 0.018) and stiffness from 347.4 to 314.7 newtons per metre (p = 0.029), a difference from baseline of 1.38 hertz and 32.7 newtons per metre. Applying the Holm and Bonferroni correction across the thirty comparisons carried out, six muscles by five parameters, no effect remains significant: the smallest adjusted probability is 0.540 for flexor tone, and the authors themselves write that the two findings should be read as nominal.

The exploratory section reports inverse correlations between how much a muscle changed during the shooting and how much it changed afterwards, strong in the posterior deltoid (r = minus 0.588) and the flexor carpi ulnaris (r = minus 0.573) and between minus 0.542 and minus 0.621 in the trapezius muscles. It is the authors who explain why these do not mean what they appear to: the two change scores share the middle measurement with opposite signs, and that alone produces negative correlations even when no effect exists.

This is a single-group observational study with repeated measures within one session, registered on ClinicalTrials. The archers are the same twenty as the 2024 paper, 14 men and 6 women, recruited by convenience through clubs: a mean age of 30 years, 175.4 cm, 77.3 kg, 5.5 years of practice, about 1.6 training sessions a week and about 111 arrows per session. Of the 50 initial candidates, 30 were excluded for upper limb injury or because they declined. In the preceding 48 hours the archers neither shot nor did demanding upper limb work.

The sequence is fixed: first measurement immediately after the warm-up, second within about 5 minutes of the fiftieth arrow, third within about 5 minutes of the hundredth, then 30 minutes of seated rest with no shooting, stretching or self-massage, then the manual therapy and, within 5 minutes of the end, the final measurement. The authors spell out that no measurement was taken between the rest and the therapy, so the final point describes the combined effect of rest, contact with the therapist and manipulation, rather than the manipulation on its own.

The therapy had two components: an oscillatory Maitland mobilisation of the shoulder, begun at the second grade and taken to the third only if the archer reported no pain, and then a high-velocity, low-amplitude manipulation of the elbow, with the forearm in full pronation and the wrist and hand in flexion, a two-second preload at the end of range and finally the thrust. The same physiotherapist, with 25 years of experience, treated everyone.

The measurements were made with a MyotonPRO, its 3-millimetre probe perpendicular to the skin, in a room at 23 °C and 55% humidity, at two points per muscle with three impulses each, with the archer seated and the bow arm supported. The assessor could not be blinded to the time point, because the sequence was fixed; neither were the archers or the therapist. The authors used a repeated-measures analysis of variance for each parameter and then applied the Holm and Bonferroni correction across all thirty comparisons.

The study states its own limits with a frankness worth noting, and this record can largely report them. One group, one session, twenty athletes: the authors explicitly call the work exploratory. There is no comparison group, neither sham nor rest-only, and no measurement was taken after the 30-minute break and before the therapy, so rest and manipulation cannot be separated in any way. The assessor knew which point in the session each reading belonged to. The intervention was twofold, shoulder mobilisation plus elbow manipulation, and the grade reached in the mobilisation varied between people, so even in principle nothing could be attributed to a specific technique.

On the numbers, the authors apply the correction for the thirty comparisons themselves and conclude that nothing significant remains; they add that the correlations between the two change scores are mathematically coupled and sensitive to regression towards the mean, and should not be read as a response to treatment. The minimal detectable change of the device for these muscles is not reported, and without it there is no way to know whether a drop of 1.4 hertz in tone rises above measurement noise.

Two things lie outside the study and matter for this registry. The first is that there is no measurement of performance or of injury: the authors say so and explicitly decline to talk about accuracy, endurance or prevention. The second is that no comparison between men and women was made, because of the imbalance in the sample. It is also worth noting that the measurements were taken on the bow arm, while the electromyography of the companion 2024 study, on the same people, concerned the string arm: the two papers look at different limbs of the same movement.

For an archer the useful result is the negative one, and it is worth taking for what it is: one hundred arrows in a session, in archers who habitually shoot about a hundred and ten, did not measurably change tone, stiffness, elasticity, relaxation time or creep in six muscles of the bow arm. Anyone expecting an ordinary session to leave a muscle "stiffer" in a sense an instrument can detect will find no confirmation here, either halfway through or at the end.

The only muscle that moved at all is the flexor carpi ulnaris, a forearm muscle, and it moved towards lower tone and stiffness at the end of the session, after half an hour of rest and the therapy. The drop does not survive correction for the number of comparisons, and the design cannot say whether it came from the break or from the therapist's hands. No practical guidance can be drawn from this, and the authors draw none: they state plainly that they are not talking about accuracy, endurance or injury prevention, because the score was never measured. In this registry the source documents that myotonometry applied to archery, for now, does not tell a hundred-arrow session apart from rest.