"What has often been indicated in these studies is that people who head a lot compete to head the ball, and in those circumstances they may clash heads and get elbows to the head, which can cause concussion, " he told CNN.
"They're not your big, strapping, 6-foot-5 machines that head the ball and run all day, " Monk said.
Soon after Blackpool won a corner and Barker rose well to head the ball into the roof of the net.
When playing soccer, I always thought you had to be nuts to launch yourself into the air and head the ball.
With 17 minutes remaining a fine run and cross by left-back Somwe Joel saw the unfortunate Omodiagbe head the ball past substitute goalkeeper Ikechukwu Ezenwa.
Minutes later, Collins' shot cleared the static Sorenson but full-back Kelly was on hand as the last line of defence to head the ball away to safety.
Robben was the architect, picking out Dante at the far post with looping cross to head the ball towards goal and allow Muller to nod the ball home.
The teenage bin Laden was tall, almost gangly, and was often picked as a forward on his school soccer team for his superior ability to head the ball.
Saganowski made no mistake with his second chance in the first minute of added time, as he dived to head the ball into the bottom corner from 12 yards.
Moments later, Carew glanced a header just wide of the far post from Milner's corner and Villa had a penalty shout rejected when Emiliano Insua appeared to head the ball on to his arm.
Cole was also in the mix but his left-footed shot was battered away by Aaron Hughes and then, when he was unmarked again, he could do no better than head the ball into Niemi's arms.
It was his equalizer on 30 minutes which caught the eye, his ability to hang in the air and generate an unfathomable amount of power to head the ball into the net remains a joy to behold.
Rangers continued to enjoy possession in defence and midfield and were almost gifted a goal when Mindaugus Baguzis' attempt to head the ball back to his keeper missed his stranded team-mate, and the goal, by a few feet.
The Spurs goalkeeper was soon shaking his head again at Mido after the Egyptian unsuccessfully tried to clear the ball with his head, requiring Robinson to throw himself to his right to tip away the ball.
Yossi Benayoun should have done better than head the loose ball tamely at Edwin van der Sar.
To stop this from happening, make sure you get your head over the ball as you play the stroke.
Celtic failed to clear a Charlie Adam corner and after a sequence of head tennis the ball fell to Ehiogu who executed a graceful overhead kick.
But concern has been emerging for some time about certain types of metal-on-metal hips, in particular those where the ball head has a diameter of 36mm or more.
He thrust the club above his head when the ball dropped to get him to 14 under, where he finished Sunday for his first PGA Tour victory in five years.
In the 77th minute, Ameobi got his head to the ball before Shearer but substitute Lee Bowyer failed to make a strong connection and sliced his shot wide of the post.
BBC: SPORT | Football | Other European | Newcastle's Euro dream over
'Well sent on John Sutton in place of Esteban Casagolda and the striker's first contribution was to head a long ball on for Forbes, whose volley hit the bar on its way out.
It was Frimpong and Kightly who combined for Wolves' equaliser, with the on-loan midfielder flicking the ball over his head to escape his markers before quickly passing the ball to the Wolves winger.
Italy left two strikers forward and the tactic paid off as Riccardo Montolivo swept a long ball over the head of Philipp Lahm, allowing Balotelli to chest the ball down and run clear before smashing an unstoppable shot beyond a stunned Manuel Neuer.
CNN: Balotelli double sends Italy through to Euro 2012 final
Cardiff's revival began with 25 minutes to go as Campbell poked the ball in with his head after Bradley Middleton had headed across goal from a high ball into the box.
BBC: SPORT | Football | Welsh | Carmarthen 2-3 Cardiff (aet)
Detroit pitcher Doug Fister was struck in the head by a batted ball during the World Series.
Other unlikely adornments are the baseball-size orbs sitting atop its legs, evoking traditional Indian ball-head war clubs.
WSJ: Changing Hands | We Are Here! | Native, North American, New | By Lee Rosenbaum
Leamy reached out over his head to ground the ball for his side's second try but Manning could not add the conversion on this occasion.
In injury time, an equaliser might have arrived when Jonathan Spector's cross found the back of Cole's head, but the ball just sailed over the corner of Sorensen's goal.
The ban, which Earl Beatty Public School put into effect last week, was not even prompted by an injury to a child, but rather came after a parent suffered a concussion from being hit in the head with a soccer ball.
The Accies forward was caught out as Craig Conway found Dixon with his quickly taken set-piece and, when the full-back's low drive struck the legs of goalkeeper Cerny, Daly rose to head the high spinning ball into the net from five yards.
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