Research theme
This is the conference presentation of the study published as Sanders, Felton & King (2018) in Journal of Sports Sciences, with Felton as first author rather than second. Same 23 elite finger spin bowlers, same 18-camera Vicon capture, same Trackman spin rates, same 30 kinematic parameters, same statistics. Its value as a standalone document is that it is the one-page version — if you want the finding in a paragraph, this is it. It adds no new data.
What they measured
Identical to the 2018 journal paper: 30 kinematic parameters covering foot orientations at contact, pelvis and shoulder orientations at back foot contact / front foot contact / ball release / follow-through, minimum orientations and total rotations, hip-shoulder separation, trunk flexion and rotation, elbow extension, front knee extension, front hip internal rotation, shoulder internal rotation, forearm pronation and wrist flexion. See Sanders 2018 — kinematic parameters for the full list in coach language.
Method detail given here: 23 elite finger spinners, ten maximal-spin good-length deliveries in an indoor facility, 18-camera Vicon, fifty-six 14 mm markers, fourth-order low-pass Butterworth filter at 30 Hz cut-off, spin rate by Trackman Doppler radar, the three highest-spin trials averaged, Pearson correlations plus stepwise linear regression. (Sampling rate is not stated in this abstract; the journal paper gives 300 Hz.)
Findings
- Spin rates 1432–2143 rpm (1685 ± 170 rpm); release speeds 17.7–23.4 m/s (20.4 ± 1.3 m/s). Identical to the journal paper.
- Eight of the 30 parameters correlated linearly with spin rate: back foot orientation at BFC; front foot orientation at FFC; pelvis orientation at FFC and at BR; minimum pelvis orientation BFC→BR; shoulder orientation at BR; minimum shoulder orientation BFC→BR; and pelvis-shoulder separation at FFC. (No r or p values are given in this abstract — for those, use the journal paper.)
- Best single predictor: pelvis orientation at ball release, explaining 43.1% of the variance in spin rate. Pelvis orientation at front foot contact explained a near-identical 42.9%.
- Conclusion: higher spin rates come from a technique where the pelvis is less side-on than coaching literature recommends, which in turn permits a larger pelvis-shoulder separation and a shoulder orientation short of side-on at front foot contact; the segments then rotate sequentially from pelvis through to forearm pronation.
TENSION (numbering, across versions): this abstract assigns 43.1% to pelvis at BR and 42.9% to pelvis at FFC. The journal paper’s body text agrees, but the journal paper’s Table 3 has the two swapped, and Sanders’ thesis abstract follows the table while the thesis’ research-question summary follows the text. The difference is 0.2 percentage points and changes no coaching advice, but the source is not internally consistent about which instant is “best”.
What a coach should look for on video
The cues are exactly those in Sanders 2018 — kinematic parameters — use that file for the detailed cue set, since it carries the correlation strengths that tell you which cues to prioritise. In one sentence, the conference version’s own coaching summary is:
Pelvis less side-on than traditionally coached → bigger pelvis-shoulder separation and shoulders short of side-on at front foot contact → sequential rotation from pelvis through to forearm pronation.
The one thing this abstract states more crisply than the journal paper is the explicit rejection of the coaching orthodoxy it was testing — Woolmer & Noakes’ model of pelvis and shoulders rotating “from a side-on position during the delivery stride, to front-on at ball release”. The abstract’s closing line is that these results “are likely to be very useful in the coaching of finger spin bowlers, as well as talent identification” — i.e. the authors see pelvis orientation as a selection screen, not just a coaching target.
Caution on using it for talent ID: this is a correlational study on 23 already-selected elite bowlers. Screening juniors out on hip angle would be an unsupported extrapolation.
Caveats and limits
- A one-page conference abstract. No correlation coefficients, no p-values, no table of means, no confidence intervals, no discussion of limitations. Anything you want to quote numerically should be sourced from the 2018 journal article instead.
- All limits of the parent study apply: n = 23, elite males only, correlational, maximal-spin lab deliveries with no batter and no accuracy demand, finger motion not measured.
- Not peer-reviewed to journal standard (conference proceedings).
Relationship to other Felton work
- Conference version of Sanders 2018 — kinematic parameters. Same dataset, same conclusions; Felton is first author here and second author there.
- Both are Chapter 5 of Sanders’ 2019 PhD.
- Presented at the same congress as the McErlain-Naylor power hitting abstract and the conference version of the ROM study.
- CONTRADICTION (with prior coaching literature, stated explicitly by the authors): contradicts Woolmer & Noakes (2008) on side-on pelvis and shoulder alignment at front foot contact.
- No contradiction with the journal version on substance; see the 43.1%/42.9% labelling TENSION above.