The data showed the average forces of a soccer-ball header were similar to those exerted on the head by punches from amateur boxers, according to Daniel Plant, a researcher in Imperial's department of mechanical engineering, who presented the data Friday at a helmet-safety science conference at the university.
McCormack's free-kick from the right was met at the far post by captain Mark Hudson who squeezed the ball home with a header from the narrowest of angles to score his first goal since his summer move to Cardiff.
Hearts remained in control in the second half and Marius Zaliukas beat Smith to a high ball, but saw his header drift away from goal, while Kingston was too high with two long-range efforts.
The Reds were almost caught unawares when Burak Yilmaz stole in to win a corner to the near post but he could not get the direction to his header as the ball went harmlessly across the area.
The Argentina playmaker took his chance moments later when Pedro crossed the ball into the box and Guilherme's poor header came to the feet of Messi who turned the ball home from close range.
Thompson got the final touch from an Aaron Hughes header to take the ball over the line and complete the scoring on 87 minutes.
Solskjaer latched on to a Rooney header and tucked the ball across goal and into the bottom corner to further add to the party atmosphere.
The tireless Tevez scored the second in first half stoppage time as he got a touch to Gareth Barry's header to lift the ball over Thomas Sorensen.
Without their captain the Gunners lack their usual midfield zest and Burnley equalized six minutes after the half-time interval when David Nugent latched on to Leon Cort's header and directed the ball over goalkeeper Manuel Almunia.
Hamilton had the best chance of the game thus far when a Stevenson header was won in the air by Simon Mensing, who knocked the ball onto Offiong, but the striker failed to keep his header under the bar.
The previously ineffectual McLean raced onto a Steven Thompson header and calmly slotted the ball past goalkeeper Jason Brown for his third goal of the season.
However, the Sunderland goalkeeper got his bearings all wrong in trying to catch a Sodje header when he allowed the ball to drop on to the bar.
In the 30th minute Kalou was the first to the ball following a Robben corner and his header was too strong for Kirkland as he made it 2-0.
Miranda almost put the ball into his own net from a defensive header that crept over the crossbar.
Hamilton substitute Richard Offiong met Graham's cross with a header on 50 minutes but the ball drifted wide.
And Randolph held Andrew Considine's header after Derek Young sent the ball back into the box following a corner.
The Dutchman failed to get near the inswinging ball, though, allowing Moore a free header at the far post.
Jermaine Beckford flicked on a header to Howson, who spread ball to Freedman on the left flank before continuing his run into the Carlisle area.
Rangers goalkeeper Allan McGregor was nearly caught out by a looping header from Velicka, but the ball was cleared to safety after striking the top of the crossbar.
North End's equaliser came seven minutes after the restart when Fulham loanee Johnson flicked a Keith Treacy header against the post and the ball went in off McCarthy's back.
Dani was at the centre of the action and he finally found the net with his third header - this time glancing the ball home from Pep Guardiola's free-kick.
Midfielder Graham Dorrans was looking an assured figure for Di Matteo's men and he produced a delightful ball to find an unmarked Bednar, whose header was tipped over by Logan.
But Reading keeper Alex McCarthy was powerless after the break as the ball hit the post from Eddie Johnson's header and struck him on the back before rolling over the line.
Stokes replied with a right-footed effort from the edge of the St Johnstone penalty area that Smith held well, then the Northern Ireland international missed with a close-range header from a Mark Wilson long-ball.
An Evans header three minutes later was goalbound but the ball flicked off a defender's head and flew over.
Hamilton's James McArthur flighted in a searching ball as injury time beckoned, but Elebert's header failed to reach the target and the sides shared the points.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
Egypt doubled their lead in the 23rd minute when Emad Motaeb was able to bundle the ball home from close range after Ahmed Raouf's header had been parried by Djidonou.
Tall, elegant and powerful, Ronaldo is as good in the air as he is with the ball at his feet, as he proved with his header against Chelsea in last year's final.
Ma-Kalambay bounded off his line but failed to make contact with the ball as Smith arrived on cue to plant a firm header into the net from 12 yards and hand Orient a shock lead.
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