Core and traditional archery: Kulunkoglu 2022

Fifteen sedentary adults taking up traditional archery were allocated at random to two groups: for seven weeks, nine had one archery lesson a week plus two trunk stabilisation sessions, and six had the archery lesson alone. Between the two groups, at the end, there was no significant difference on any measure. That is the main result, and the authors put it in their conclusion.

The changes, where they occur, are within groups. In the exercise group the side bridge hold rose on the right, from a median of 24.0 to 34.0 seconds (p = 0.008), and on the left, from 26.5 to 42.0 seconds (p = 0.028), together with the force measured for the transverse abdominis plus the multifidus, from 4 to 8 mmHg (p = 0.048). In the archery-only group the side bridge hold rose on the left, from 28.7 to 38.5 seconds (p = 0.046), as did balance on the left leg, from 7.7 to 22.8 seconds (p = 0.028). Nothing else moved: prone bridge, trunk flexion and extension, number of sit-ups and modified push-ups in 30 seconds, force and endurance of the transverse abdominis on its own, balance on the right leg.

A randomised pilot study. Seventy-eight people were assessed and 15 were included: over 18, not exercising regularly for six months, with no previous archery experience, no orthopaedic injury or surgery in the previous six months and no cardiovascular conditions. Allocation used an online randomisation programme, nine to the exercise group and six to the control.

Static endurance of the trunk muscles was measured with the McGill protocol, stopwatch in hand, in four tests: side bridge, modified Biering-Sorensen trunk extension, trunk flexion and prone bridge, each stopped when the position broke down or the participant said they could not continue, with 1 to 3 minutes' rest between them. Functional strength is the number of sit-ups and modified push-ups in 30 seconds. For the transverse abdominis and the multifidus a pressure biofeedback unit was used: prone, with the cuff under the lower abdomen between the anterior superior iliac spines and the manometer brought to 70 mmHg, asking for a slow contraction without holding the breath and without tilting the pelvis; supine with knees flexed, cuff under the vertebrae between the posterior superior iliac spines and pressure inflated to 40 mmHg, asking the participant to draw the abdominal wall in without moving spine or pelvis. For each test the change in pressure and the seconds held were recorded. Balance is the time standing on one leg, eyes closed, with the other knee flexed to 90 degrees, up to a maximum of 30 seconds, as the mean of three trials.

The stabilisation programme, one session a week with the physiotherapist and one at home, comprised posterior pelvic tilt, bridging, crunches, single-leg raise in four-point kneeling, dead bug and plank, starting from one set of eight repetitions, moving to two sets of ten in the third week and three sets in the sixth. The archery lesson, identical for both groups and given by the same instructor, started from stance, grip and draws with a training device at the lowest available draw weight; from the second to the fifth week shots at 5, 8 and 10 metres were added, with the number of draws, the number of arrows and the distances all increasing; in the sixth and seventh weeks it moved on to shots with a hold before release and to free shooting, lengthening the hold. Each session, archery or exercise, lasted about 45 minutes.

Nine people against six, in a study presented as a pilot: with these numbers the absence of a difference between groups does not separate a programme that changes nothing from a sample too small to see whether it changes anything. The authors list the rest themselves: no instrumented measures among the outcomes, low programme intensity and no third group doing neither archery nor exercises, so there is no way to know what would have changed with nothing at all.

One problem lies in the baseline groups. The randomisation produced two groups differing in height, 161.3 cm against 169.7 (p = 0.012), and even where the difference is not significant the starting values are widely spread: on the prone bridge the control group ranges from 12 to 126 seconds. The within-group comparisons number about thirteen per group with no correction, with p values between 0.008 and 0.048: a couple of significant results are expected from the number of tests alone, and in the exercise group two of the three concern a measure that was also an exercise in the programme.

The tests depend on motivation, since they are timed holds to failure, and nobody was blinded. The balance test stopped at 30 seconds, and the control group reached medians of 22.8 and 26.9 seconds with maxima of 30: the room left to improve was nearly used up. In the balance table, finally, the control group's mean and standard deviation after the programme are identical for the right and the left leg, 23.83 plus or minus 8.78, which is hard to explain except as a transcription error. Nothing about shooting was measured: no score, no spread.

The study is about sedentary adult beginners taking up traditional archery, not about trained archers, and the question it asks is whether adding trunk exercises to the weekly lesson changes anything over seven weeks. The answer, with these numbers, is that nothing shows.

One secondary finding is worth noting for how it came about: the group doing only one archery lesson a week also improved on two measures, the left side bridge hold and single-leg balance. That does not show that archery trains the trunk, since the group doing nothing is missing and those comparisons are within-group, but it is the observation from which the authors argue for further studies. For anyone teaching, the reusable part is the progression of the lesson, from empty draws to shots with a hold, described in enough detail to repeat.