Both sides take part in head impact studypublished at 14:11 Greenwich Mean Time 31 October 2021
England v New Zealand (14:30 GMT)
Both teams are wearing special mouthguards that contain head-impact monitors during today's match.
It marks a significant shift towards collecting data for women after studies which have shown they are twice as likely as men to suffer concussions.
Earlier today, World Rugby also announced a new women's player welfare steering group that would work on initiatives designed specifically to keep female players safe.