Core stability in shooting: Zemkova 2022 review

This is not a study on archers: it is a scoping review of the literature on postural and core stability in sports with high demands on balance and spinal posture, asking whether the variables usually measured have anything to do with performance. Of 42 papers examined, 21 were included: 14 on postural stability out of 29 candidates and 7 on core stability out of 13.

Archery appears in two studies only, both already in the registry. One is the work on 39 elite recurve archers in which clicker reaction time, draw force and above all sway speed after release are linked to the score of the shot. The other covers eight national-level archers shooting six arrows at 13 metres, with the centre of pressure trajectory and that of a marker on the bow measured during the aiming phase: the length of both traces was greater in the lowest-scoring shots than in the highest, and in the highest-scoring shots body sway and bow sway were correlated with one another.

Hence the authors' conclusion that postural stability matters in archery, as in biathlon, gymnastics, shooting and team sports. For the core the picture differs: the authors find little evidence that an improvement in core stability carries over into sporting performance, even when training programmes improve back muscle strength and endurance and body balance. A closing table lists the gaps in the literature: small samples, few high-level athletes, few women, a control group almost always missing, general fitness tests rather than sport-specific ones, variables described imprecisely, and four- to eight-week training periods that are hard to compare because they were run at different points in the season.

The search was run on MEDLINE, Scopus, Web of Science, PubMed and the Cochrane Library, completed with Google Scholar, SpringerLink and Elsevier, limited to English and preferring articles from 1990 onwards. The reference lists of existing reviews were checked as well. Conference proceedings, theses, books, case studies, papers without original research and incomplete ones were excluded; where two articles reported the same data, the more recent was kept.

The search string combined terms such as postural stability, core stability, core endurance, core strength, core training, spinal posture, lumbopelvic stability, athletes, sport-specific exercise, athletic performance, functional movement and neuromuscular control. Because the first and narrower search returned very few suitable articles, it was widened to studies on the effects of sport-specific training and of balance or core exercises on the movements and skills of a given sport. Both authors carried out the selection and appraisal together.

The format chosen is the scoping review, which maps a literature and identifies its gaps rather than estimating an effect: there is no meta-analysis, no summary measure and no formal risk-of-bias assessment of the included studies. The results are presented in two descriptive tables, one for postural stability and one for the core, with authors, study design, participants, main variables, main findings and a column of interpretation; a third table collects the gaps and the proposals for future research. The authors' reservations about the included work concern sample size and representativeness, incomplete information on the methods and the variables analysed, and uncontrolled compliance with the protocols.

For the registry the main limitation is one of relevance: of the 21 studies included, two concern archery, and both are studies the registry already lists in their own right. Everything else is about rifle and pistol shooting, biathlon, gymnastics, dance, football, handball, tennis, golf, baseball, hockey, running, rowing and other sports. Anyone looking here for evidence on archers finds a second-hand citation rather than new data.

The format itself sets limits. A scoping review collects and describes, it does not weigh: the included studies were neither quality-appraised nor pooled, so a sentence such as "postural stability plays an important role in performance" summarises what those papers say, not how firmly they say it. The search was limited to English and the selection was widened mid-course, after the initial criteria returned too little, which makes the boundaries of inclusion less clear-cut.

The authors themselves list the problems of the studies they found, and these apply to the two on archery as well: small samples, few top-level athletes, few female participants, a control group almost always missing, general balance tests rather than testing under the conditions of the sport, imprecise description of the variables, and short training periods placed at different points in the season. They add that centre of pressure measures taken in a laboratory may not be specific enough for athletes at a high level of competition, and that for the core the original question, whether stability training transfers to performance, remains open.

The review is there to frame a question, not to settle anything on a shooting line. It does say two things usefully, though.

The first is that in aiming sports postural stability is one of the few variables on which several independent research groups find a link with the result, and archery sits in that group on the strength of two studies only. The authors set those two papers alongside a far larger literature on rifle and pistol shooting, where body sway is seen to move together with the aim point. The juxtaposition is theirs: archery has a bow to hold up, a clicker and a release off the fingers, and these studies do not show that what holds for a rifle holds for a recurve.

The second concerns the core. Here the message is one of caution: programmes that train core stability do improve strength, endurance and balance, but the step across to sporting performance is not demonstrated, and the authors say so in several places. In archery no study of this kind exists at all.

Beyond that, the list of gaps closing the article is the most transferable part: it is a reminder that most of what is written about balance and performance comes from small samples, often without a control group, measured with standing tests that have little to do with the competition movement.