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.
2015-16 Classifications Announced
March 30, 2015
By Geoff Kimmerly
Second Half editor
Classifications for Michigan High School Athletic Association elections and postseason tournaments in traditionally classified sports (A, B, C, D) for the 2015-16 school year have been announced, with enrollment breaks for postseason tournaments set up by divisions posted to each sport’s page on the MHSAA Website.
Classifications for the upcoming school year are based on a second semester count date, which for MHSAA purposes was Feb. 11. The enrollment figure submitted for athletic classification purposes may be different from the count submitted for school aid purposes, as it does not include students ineligible for athletic competition because they reached their 19th birthday prior to September 1 of the current school year and will not include alternative education students if none are allowed athletic eligibility by the local school district.
After all the counts are submitted, tournament-qualified member schools are ranked according to enrollment, and then split as closely into quarters as possible. For 2015-16, there are 750 tournament-qualified member schools with 187 schools in both Class A and Class B, and 188 schools in both Class C and Class D.
Effective with the 2014-15 school year, schools with 875 or more students are in Class A in MHSAA postseason tournament competition. The enrollment limits for Class B are 420-874; Class C is 213-419; and schools with enrollments of 212 and fewer are Class D. The break between Classes A and B decreased seven students from 2014-15, the break between Classes B and C decreased four students, and the break between Classes C and D is two students fewer than the current school year.
The new classification breaks will see 13 schools move up in class for 2015-16, while 17 schools will move down.
Schools recently were notified of their classification. MHSAA Executive Director John E. "Jack" Roberts said schools may not subsequently lower their enrollment figure. However, if revised enrollment figures should be higher and indicate that a school should be playing in a higher class, that school would be moved up.
Schools have the option to play at any higher classification for a minimum of two years, but must exercise the option by April 15 for fall sports, August 15 for winter sports and October 15 for spring sports.
MHSAA tournament sports that will be conducted in traditional classifications for 2014-15 are Basketball and Girls Volleyball. Football will use traditional classifications to determine playoff points.
Sports which will compete in nearly equal divisions are: Baseball, Bowling, Girls Competitive Cheer, Lower Peninsula Cross Country, Lower Peninsula Golf, Ice Hockey, Lacrosse, Lower Peninsula Soccer, Skiing, Softball, Lower Peninsula Swimming and Diving, Lower Peninsula Tennis, Lower Peninsula Track and Field and Wrestling.
Visit the respective sport pages on the MHSAA Website to review the divisional alignments.
The divisions and qualifiers for the MHSAA Football Playoffs will be announced on Selection Sunday, Oct. 25, 2015.
A complete list of school enrollments used to determine classifications for the 2015-16 school year can be found on the Enrollment & Classification page of the MHSAA Website.
Here is a complete list of schools changing classification for 2015-16. (Note: This list does not include schools opting up in class/division for tournaments, which can be found on the Administrators page of the MHSAA Website, under Enrollment and Classification):
Moving Up From Class B to Class A
Haslett
Jackson Northwest
Parma Western
South Lyon East
Sturgis
Moving Down From Class A to Class B
Detroit Mumford
Fruitport
Hazel Park
Sault Area
Stevensville Lakeshore
Moving Up From Class C to Class B
Fennville
Grand Rapids West Michigan Aviation Academy
Hillsdale
Jackson Lumen Christi
Jonesville
Warren Michigan Collegiate
Moving Down From Class B to Class C
Delton Kellogg
Detroit Community
Detroit Pershing
Detroit Southeastern
Detroit West Side Academy
Hemlock
Lakeview
Moving Up From Class D to Class C
Burton Madison Academy
St. Ignace LaSalle
Moving Down From Class C to Class D
Highland Park Renaissance Academy
Marcellus
Potterville
Rogers City
Vestaburg
New Postseason Eligible Tournament Schools in 2015-16
Brighton Charyl Stockwell Preparatory
Canton Preparatory
Detroit Cornerstone Health & Technology
Detroit Public Safety Academy
Detroit Westside Christian Academy
Grand Rapids Hope Academy of West Michigan
Enrollment Breaks by Classes – 2015-16
(Number of schools in parentheses)
Class A: 875 and above (187 schools)
Class B: 420 – 874 (187)
Class C: 213 – 419 (188)
Class D: 212 and below (188)
The MHSAA is a private, not-for-profit corporation of voluntary membership by more than 1,400 public and private senior high schools and junior high/middle schools which exists to develop common rules for athletic eligibility and competition. No government funds or tax dollars support the MHSAA, which was the first such association nationally to not accept membership dues or tournament entry fees from schools. Member schools which enforce these rules are permitted to participate in MHSAA tournaments, which attract more than 1.4 million spectators each year.
PHOTO: Haslett, this season's Class B girls basketball runner-up, will play in Class A for the 2015-16 season.