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.
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Field Hockey Debut, Tennis Finals Change Among Most Notable as Fall Practices Set to Begin
By
Geoff Kimmerly
MHSAA.com senior editor
August 8, 2025
The addition of girls field hockey as a sponsored postseason championship sport and a revised schedule for Lower Peninsula Boys Tennis Finals are the most significant changes to fall sports as practices are set to begin Monday, Aug. 11, for an anticipated 100,000 high school athletes at Michigan High School Athletic Association member schools.
The fall season includes the most played sports for both boys and girls; 36,210 football players and 19,679 girls volleyball players competed during the Fall 2024 season. Teams in those sports will be joined by competitors in girls and boys cross country, field hockey, Lower Peninsula girls golf, boys soccer, Lower Peninsula girls swimming & diving, Upper Peninsula girls tennis and Lower Peninsula boys tennis in beginning practice next week. Competition begins Aug. 15 for cross country, field hockey, golf, soccer and tennis, Aug. 20 for swimming & diving and volleyball, and Aug. 28 for varsity football.
Field hockey is one of two sports set to make its debut with MHSAA sponsorship during the 2025-26 school year; boys volleyball will play its first season with MHSAA sponsorship in the spring.
There are 37 varsity teams expected to play during the inaugural field hockey season. There will be one playoff division, with the first MHSAA Regionals in this sport beginning Oct. 8 and the first championship awarded Oct. 25.
To conclude their season, Lower Peninsula boys tennis teams will begin a pilot program showcasing Finals for all four divisions at the same location – Midland Tennis Center – over a two-week period. Division 4 will begin play with its two-day event Oct. 15-16, followed by Division 1 on Oct. 17-18, Division 2 on Oct. 22-23 and Division 3 played Oct. 24-25.
Also in Lower Peninsula boys tennis, and girls in the spring, a Finals qualification change will allow for teams that finish third at their Regionals to advance to the season-ending tournament as well, but only in postseason divisions where there are six Regionals – which will be all four boys divisions this fall.
The 11-Player Football Finals at Ford Field will be played this fall over a three-day period, with Division 8, 4, 6 and 2 games on Friday, Nov. 28, and Division 7, 3, 5 and 1 games played Sunday, Nov. 30, to accommodate Michigan State’s game against Maryland on Nov. 29 at Ford Field.
Two more changes affecting football playoffs will be noticeable this fall. For the first time, 8-Player Semifinals will be played at neutral sites; previously the team with the highest playoff-point average continued to host during that round. Also, teams that forfeit games will no longer receive playoff-point average strength-of-schedule bonus points from those opponents to which they forfeited.
A pair of changes in boys soccer this fall will address sportsmanship. The first allows game officials to take action against a team’s head coach in addition to any cautions or ejections issues to players and personnel in that team’s bench area – making the head coach more accountable for behavior on the sideline. The second change allows for only the team captain to speak with an official during the breaks between periods (halftime and during overtime), unless another coach, player, etc., is summoned by the official – with the penalty a yellow card to the offending individual.
A few more game-action rules changes will be quickly noticeable to participants and spectators.
- In volleyball, multiple contacts by one player attempting to play the ball will now be allowed on second contact if the next contact is by a teammate on the same side of the net.
- In swimming & diving, backstroke ledges will be permitted in pools that maintain a 6-foot water depth. If used in competition, identical ledges must be provided by the host team for all lanes, although individual swimmers are not required to use them.
- Also in swimming & diving – during relay exchanges – second, third and fourth swimmers must have one foot stationary at the front edge of the deck. The remainder of their bodies may be in motion prior to the finish of the incoming swimmer.
- In football, when a forward fumble goes out of bounds, the ball will now be spotted where the fumble occurred instead of where the ball crossed the sideline.
The 2025 Fall campaign culminates with postseason tournaments beginning with the Upper Peninsula Girls Tennis Finals during the week of Sept. 29 and wrapping up with the 11-Player Football Finals on Nov. 28 and 30. Here is a complete list of fall tournament dates:
Cross Country
U.P. Finals – Oct. 18
L.P. Regionals – Oct. 24 or 25
L.P. Finals – Nov. 1
Field Hockey
Regionals – Oct. 8-21
Semifinals – Oct. 22 or 23
Final – Oct. 25
11-Player Football
Selection Sunday – Oct. 26
District Semifinals – Oct. 31 or Nov. 1
District Finals – Nov. 7 or 8
Regional Finals – Nov. 14 or 15
Semifinals – Nov. 22
Finals – Nov. 28 and 30
8-Player Football
Selection Sunday – Oct. 26
Regional Semifinals – Oct. 31 or Nov. 1
Regional Finals – Nov. 7 or 8
Semifinals – Nov. 15
Finals – Nov. 22
L.P. Girls Golf
Regionals – Oct. 6, 7, 8, 9, 10, or 11
Finals – Oct. 17-18
Boys Soccer
Districts – Oct. 8-18
Regionals – Oct. 21-25
Semifinals – Oct. 29
Finals – Nov. 1
L.P. Girls Swimming & Diving
Diving Regionals – Nov. 13
Swimming/Diving Finals – Nov. 21-22
Tennis
U.P. Girls Finals – Oct. 1, 2, 3, or 4
L.P. Boys Regionals – Oct. 8, 9, 10, or 11
L.P. Boys Finals – Oct. 15-16 (Division 4), Oct. 17-18 (Division 1), Oct 22-23 (Division 2), and Oct. 24-25 (Division 3)
Girls Volleyball
Districts – Nov. 3-8
Regionals – Nov. 11 & 13
Quarterfinals – Nov. 18
Semifinals – Nov. 20-21
Finals – Nov. 22
The MHSAA is a private, not-for-profit corporation of voluntary membership by more than 1,500 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.