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.

Participation Remains Steady in 2018-19

July 18, 2019

By Geoff Kimmerly
Second Half editor

Michigan High School Athletic Association member schools continued to experience a decade-long decline in enrollment in 2018-19, and participation across 28 sports for which the MHSAA sponsors postseason tournaments also decreased slightly. However, while the drop in enrollment was 1.28 percent from the previous school year, participation fell only 1.03 percent as four sports repeated in setting records.

A total of 281,992 participants competed in MHSAA-sponsored sports this past school year. The overall MHSAA participation totals count students once for each sport in which they participate, meaning students who are multiple-sport athletes are counted more than once.

Boys participation fell 1.2 percent to 161,614, and for the first time in four years girls participation also decreased, by eight tenths of a percent to 120,378. However, both reductions were smaller than losses in enrollment of 1.36 percent for boys and 1.19 for girls. Since the 2008-09 school year, overall enrollment in MHSAA member high schools is down 12.8 percent. But during that time, overall participation in MHSAA-sponsored sports is down only 7.3 percent.

Girls lacrosse continued its run of setting a participation record every season since becoming a sponsored tournament sport in 2005, this spring with 3,180 participants – a 9.7-percent increase from a year ago. Boys lacrosse set a record for the third consecutive year, up 5.2 percent with 5,438 participants. Both boys and girls bowling also repeated in breaking participation records – boys bowling participation increased 4.7 percent over 2017-18 with 4,329 participants, while girls bowling was up 1.1 percent with 3,093 athletes. Boys cross country, with 9,588 athletes, just missed last year’s record-setting total but still saw its second-largest group of participants since totals first were tracked year-to-year in 1991-92.

Seven more sports saw increases in participation in 2018-19, boys skiing leading the way with 11.2-percent growth – its 6,284 athletes were the sport’s most since 2014-15 thanks with an increase of three tenths of a percent over a year ago. Girls and boys tennis both saw increases; girls 1.8 percent to 9,286 athletes, its most since 2011-12, and boys up 1.6 percent to 6,261 athletes, its most since 2014-15.

Girls swimming & diving was up 1.1 percent to 5,794 athletes, its most since 2013-14. Girls track & field had its highest number of participants since 2009-10 with 17,406, with an increase of seven tenths of a percent from last year. Wrestling increased a percent from 2017-18, to 9,494 athletes, ending two years of declines. Boys Golf was up three tenths of a percent to 6,284 athletes, ending three straight years of decreases.

While 17 sports saw decreases in participation, eight saw decreases by smaller percentages than the loss of enrollment: boys basketball (-1.2 percent), girls competitive cheer (-0.6), boys cross country (-0.7), girls gymnastics (-1.1), girls skiing (-0.5), boys soccer (-0.9), girls soccer (-0.1) and boys track & field (-0.1). Football, despite a decrease in participation of 4.3 percent, remains the most played sport by far with 35,412 participants. Boys track & field is second with 23,548, followed by boys basketball with 21,125. Girls volleyball, despite a 1.8-percent decline from a year ago, remains the most popular girls sport with 19,072 athletes.

The participation figures are gathered annually from MHSAA member schools to submit to the National Federation of State High School Associations for compiling of its national participation survey. Results of Michigan surveys from the 2000-01 school year to present may be viewed on the MHSAA Website.

The following chart shows participation figures for the 2018-19 school year from MHSAA member schools for sports in which the Association sponsors a postseason tournament:

BOYS

GIRLS

Sport

Schools (A)

Participants

Schools (A)

Participants (B)

Baseball

639/9

17,211

-

0/23

Basketball

731/2

21,119

693

15,376/6

Bowling

398/13

4,302

370

3,093/27

Competitive Cheer

-

-

347

6,672

Cross Country

634/0

9,588

619

8,144

Football - 11 player

572/82

33,868

-

0/94

8-player

79/10

1,432

-

0/18

Golf

504/74

6,136

337

3,587/148

Gymnastics

-

-

86

694

Ice Hockey

242/10

3,282

-

-/12

Lacrosse

163/8

5,423

120

3,180/15

Skiing

102/0

924

95

763

Soccer

492/16

14,425

476

13,209/67

Softball

-

-

628

13,290

Swimming & Diving

248/18

4,968

262

5,794/35

Tennis

290/17

6,221

330

9,286/40

Track & Field

679/0

23,548

673

17,406

Volleyball

-

-

713

19,072

Wrestling

466/186

9,167

-

-/327

 

(A) The first number is the number of schools reporting sponsorship on the Sports Participation Survey, including primary and secondary schools in cooperative programs as of May 15, 2019. The second number indicates the number of schools that had girls playing on teams consisting primarily of boys.

(B) The second number indicates the number of additional girls playing on teams consisting primarily of boys and entered in boys competition.

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.