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Globally, over three million women participate in rugby union, yet injury prevention and training strategies are predominantly based on androcentric data. These strategies may have limited generalisability to females, given the cervical spine is more susceptible to whiplash and less adept at resisting inertial loading. A total of 53 university rugby union players (25 female, 28 male, 20.7 ± 1.8 years) had their isometric neck strength measured. Bespoke instrumented mouthguards were used to record the magnitude of head impact events in six female and seven male competitive matches. Mean female maximal isometric neck strength was 47% lower than male. Independent samples Mann–Whitney U tests showed no significant differences for peak linear head acceleration (female: median 11.7 g, IQR 7.9 g; male: median 12.5 g, IQR 7.0 g  p =.23) or peak rotational head acceleration (female: median 800.2 rad·s −2 , IQR 677.7 rad·s −2 ; male: median 849.4 rad·s −2 , IQR 479.8 rad·s −2 ;  p =.76), despite the mean male body mass being 24% greater than female. Coded video analysis revealed substantial differences in head‐impact mechanisms; uncontrolled whiplash dominated &gt;50% of all recorded female impact events and &lt;0.5% in males. Direct head‐to‐ground impacts comprised 26.1% of female and 9.7% of male impacts, with whiplash occurring in 78.0% and 0.5%, respectively. Overall, the data provided in this study do not support the generalisation of male‐derived training and injury‐prevention data to female rugby athletes. These results suggest a considerable research effort is required to identify specific weakness of female rugby players and derive appropriate training, injury prevention and return to play protocols.   HighlightsVideo analysis revealed substantial differences in head‐impact mechanisms, with uncontrolled whiplash dominating &gt;50% of all recorded female impact events but rarely in males.  Isometric neck strength was 47% lower in female players than males.  Direct head‐to‐ground impacts accounted for 26.1% and 9.7% of female and male impacts, with whiplash occurring in 78.0% and 0.5%, respectively.

Sex differences in neck strength and head impact kinematics in university rugby union players