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Fig. 1 | Chiropractic & Manual Therapies

Fig. 1

From: Wearing American Football helmets increases cervicocephalic kinaesthetic awareness in “elite” American Football players but not controls

Fig. 1

This figure shows the measurement chart target for quantifying repositioning error (a) and the cervical range of motion (CROM) devices used for assessing unhelmeted (b) and helmeted (c) range of motion. Figure 1a shows the wall chart in situ illustrating the concentric evenly placed circles about the (0, 0) centre point with a laser light visible between rings labelled 1 and 2 above the centre spot. In Fig. 1b, the modified CROM can be seen showing the side mounted gravity goniometer and the rotational arm suspended above vertex of the subject’s head which holds the mounted pencil laser. The final element (1c) shows the modified American football helmet with the rotational arm of the CROM mounted on the front of the helmet and gravity goniometer on the side in line with the vertex of the helmet. In all cases, the rotational arm of the goniometer was only used as a stable point to mount the pencil laser

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