Study: Single-Sport Athletes Injured More
November 3, 2016
A study conducted by the University of Wisconsin School of Medicine and Public Health and funded by the National Federation of State High School Associations (NFHS) Foundation revealed that high school athletes who specialize in a single sport sustain lower-extremity injuries at significantly higher rates than athletes who do not specialize in one sport.
The study was conducted throughout the 2015-16 school year at 29 high schools in Wisconsin involving more than 1,500 student-athletes equally divided between male and female participants. The schools involved in the study represented a mixture of rural (14), suburban (12) and urban (3) areas, and enrollments were equally diverse with 10 small schools (less than 500 students), 10 medium schools (501-1,000 students) and nine large schools (more than 1,000 students).
Athletes who specialized in one sport were twice as likely to report previously sustaining a lower-extremity injury while participating in sports (46%) than athletes who did not specialize (24%). In addition, specialized athletes sustained 60 percent more new lower-extremity injuries during the study than athletes who did not specialize. Lower-extremity injuries were defined as any acute, gradual, recurrent or repetitive-use injury to the lower musculoskeletal system.
“While we have long believed that sport specialization by high school athletes leads to an increased risk of overuse injury, this study confirms those beliefs about the potential risks of sport specialization,” said Bob Gardner, NFHS executive director. “Coaches, parents and student-athletes need to be aware of the injury risks involved with an overemphasis in a single sport.”
Among those who reported previously sustaining a lower-extremity injury, the areas of the body injured most often were the ankle (43%) and knee (23%). The most common types of previous injuries were ligament sprains (51%) and muscle/tendon strains (20%).
New injuries during the year-long study occurred most often to the ankle (34%), knee (25%) and upper leg (13%), with the most common injuries being ligament sprains (41%), muscle/tendon strains (25%) and tendonitis (20%).
In addition, specialized athletes were twice as likely to sustain a gradual onset/repetitive-use injury than athletes who did not specialize, and those who specialized were more likely to sustain an injury even when controlling for gender, grade, previous injury status and sport.
Thirty-four (34) percent of the student-athletes involved in the Wisconsin study specialized in one sport, with females (41%) more likely to specialize than males (28%). Soccer had the highest level of specialization for both males (45%) and females (49%). After soccer, the rate of specialization for females was highest for softball (45%), volleyball (43%) and basketball (37%). The top specialization sports for males after soccer were basketball (37%), tennis (33%) and wrestling (29%).
The study, which was directed by Timothy McGuine, Ph.D., ATC, of the University of Wisconsin, also documented the effects of concurrent sport participation (participating in an interscholastic sport while simultaneously participating in an out-of-school club sport), which indicated further risk of athletes sustaining lower-extremity injuries.
Almost 50 percent of the student-athletes involved in the survey indicated they participated on a club team outside the school setting, and 15 percent of those individuals did so while simultaneously competing in a different sport within the school. Seventeen (17) percent of the student-athletes indicated that they took part in 60 or more primary sport competitions (school and club) in a single year. Among those student-athletes in this group who sustained new lower-extremity injuries during the year, 27 percent were athletes who specialized in one sport.
The student-athletes involved in the study were deemed “specialized” if they answered “yes” to at least four of the following six questions: 1) Do you train more than 75 percent of the time in your primary sport?; 2) Do you train to improve skill and miss time with friends as a result?; 3) Have you quit another sport to focus on one sport?; 4) Do you consider your primary sport more important than your other sports?; 5) Do you regularly travel out of state for your primary sport?; 6) Do you train more than eight months a year in your primary sport?
Although some sports (field hockey, lacrosse) are not offered in Wisconsin and were not included in the study, the study concluded that since specialization increased the risk of lower-extremity injuries in sports involved in the survey it would also likely increase the risk of injuries in sports that were not a part of the study.
Rules Changes Minimize Health Risks
August 3, 2017
By Geoff Kimmerly
Second Half editor
A pair of football rules changes taking effect this season build on continuing work to minimize health risks in all interscholastic sports as 2017-18 fall practices begin next week for member schools of the Michigan High School Athletic Association.
Practice in football must begin on Aug. 7 for all schools wishing to begin regular-season games the weekend of Aug. 24-26. Schools must have 12 days of preseason practice at all levels before their first game, over a period of 16 calendar days before the first kickoff.
Practice sessions for all other sports begin Wednesday (Aug. 9). In golf and tennis, competition may commence no earlier than after three separate days of team practice, and not before seven calendar days. The first day competition may take place in golf and tennis is Aug. 16. In all other fall sports, contests can take place after seven days of practice for the team and not before nine calendar days. The first day competition may take place in cross country, soccer, swimming & diving, and volleyball is Aug. 18.
This fall, two football game dates again precede Labor Day, and a number of MHSAA schools will play their first varsity games on Thursday, Aug. 24. In Week 1, 141 varsity games will be played on Thursday, 153 contests will be played on Friday, and 16 games will be played on Saturday. In the second week, four games will be played Wednesday, 238 games will take place Thursday, 64 will be played Friday, and five contests are Saturday.
A change to the allowable level of contact on a blindside block in football is one of the latest rules changes aimed at increasing player safety. A blindside block involves contact by a blocker against an opponent who, because of physical positioning and focus of concentration (for example, while following a ball carrier on a kickoff return), is vulnerable to injury by a block coming from outside his field of vision. Blindside blocks now must be initiated with open hands only; blindside contact that is forceful and initiated with other parts of the body outside of the free blocking zone will be penalized as excessive and unnecessary.
In addition to redefining the blindside block, the National Federation of State High School Associations (NFHS) sought to also minimize risk by eliminating the pop-up kick – that is, any free kick during which the kicker drives the ball immediately to the ground, causing it to bounce only once and into the air similar to the flight of a ball kicked directly off the tee. Kicks off a tee that bounce multiple times and then pop into the air remain allowed.
A few other notable rules changes in football will be apparent this fall:
• A defensive player will be called for encroachment for striking the offensive snapper’s hand or arm, or the ball, prior to the snapper releasing the ball to begin a play.
• Non-contact face guarding is no longer considered pass interference.
• A team accepting a penalty during the final two minutes of either half now will have the option of re-starting the clock at the snap of the ball rather than the referee’s ready-for-play signal.
While most fall sports face at least minor rules changes this season, a few more of the most noticeable adjustments will come in boys soccer and girls swimming & diving.
• In boys soccer, overtime periods and shootouts during the regular season have been eliminated. Leagues and conferences are allowed an overtime option for their end-of-season bracketed tournaments, but overtime in those cases must not exceed two 10-minute periods plus a shootout. Multi-team regular-season tournaments also may receive waivers to employ a shootout if it is used to determine the winner of a game.
• Also in soccer, kickoffs may now travel in any direction from the center of the field. Previously, kickoffs at the high school level were required to move forward down the field of play.
• In girls swimming & diving, a diver will need only four regular-season wins (instead of the previous five) to qualify for the Regional Diving Qualification Meet. A diver also may qualify if she places ahead of all divers from opposing schools in varsity competition in at least four meets, even if she does not finish ahead of her teammates.
• Also in swimming & diving, to promote safer take-offs during relays, the second, third and fourth swimmers must have at least one foot in contact with the starting platform in front of the starting block wedge during take-off. Those second, third and fourths swimmers may not take off with both feet on top of the starting block wedge.
The 2017 fall campaign culminates with postseason tournaments beginning with the Upper Peninsula Girls Tennis Finals the week of Sept. 25 and wraps up with the 11-Player Football Playoff Finals on Nov. 24 and 25. Here is a complete list of fall tournament dates:
Cross Country
U.P. Finals – Oct. 21
L.P. Regionals – Oct. 27 or 28
L.P. Finals – Nov. 4
11-Player Football
Selection Sunday – Oct. 22
Pre-Districts – Oct. 27 or Oct. 28
District Finals – Nov. 3 or 4
Regional Finals – Nov. 10 or 11
Semifinals – Nov. 18
Finals – Nov. 24-25
8-Player Football
Selection Sunday – Oct. 22
Regional Semifinals – Oct. 27 or Oct. 28
Regional Finals – Nov. 3 or 4
Semifinals – Nov. 11
Finals – Nov. 17
L.P. Girls Golf
Regionals – Oct. 11 or 12 or 13 or 14
Finals – Oct. 20-21
Soccer
Boys L.P. Districts – Oct. 16-21
Boys L.P. Regionals – Oct. 24-28
Boys L.P. Semifinals – Nov. 1
Boys L.P. Finals – Nov. 4
L.P. Girls Swimming & Diving
Diving Regionals – Nov. 9
Swimming/Diving Finals – Nov. 17-18
Tennis
U.P. Girls Finals – Sept. 27-30
L.P. Boys Regionals – Oct. 12 or 13 or 14
L.P. Finals – Oct. 20-21
Girls Volleyball
Districts – Oct. 30-Nov. 4
Regionals – Nov. 7 & 9
Quarterfinals – Nov. 14
Semifinals – Nov. 16-17
Finals – Nov. 18