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 Rises in 2015-16

June 30, 2016

By Geoff Kimmerly
Second Half editor 

Despite another slight decline in enrollment at Michigan High School Athletic Association member high schools for the 2015-16 school year, participation in sports rose for the first time since 2010-11 as a total of 284,227 participants took part in the 28 sports for which postseason tournaments are sponsored by the MHSAA.

This year’s 0.71 percent dip in enrollment at member schools is the latest in a steady decrease that has seen enrollment fall nearly 12 percent total since 2006-07; however, participation in MHSAA-sponsored sports was up 0.57 percent over 2014-15. A total of 15 sports saw participation increases from the school year before, with boys and girls bowling, boys cross country and girls lacrosse setting records.

Girls participation was up 1.7 percent to 119,281 participants, despite a fall in girls enrollment of sixth tenths of a percent. Boys participation did fall a slight two tenths of a percent, to 164,946 participants, but boys enrollment fell eighth tenths of a percent from the previous school year. The overall MHSAA totals count students once for each sport in which they participate, meaning students who are multiple-sport athletes are counted more than once. 

Girls lacrosse continued its streak of setting a participation record every season since becoming a sponsored tournament sport in 2005, this time with a 7.2 increase in participation to 2,775 athletes. Boys bowling saw a 3.7 percent increase this season to a record total of 3,860 athletes, while girls bowling was up 2.6 percent for a record total of 3,047. Boys cross country set a record for the second time in three seasons, this time up 5.3 percent with 9,254 runners.

A number of sports experienced bounce-backs from decreases over recent years. Boys basketball (0.5 percent increase to 21,524 athletes) was up after two straight years of decreases, while girls softball (5.2 percent increase to 13,788 athletes) was up after four straight years of lowering numbers. Boys track & field had seen participation decrease six straight seasons before bouncing back 1.6 percent this spring with 22,803 athletes, and wrestling also came back from six straight seasons of decreases with a 1.3 percent increase to 9,601 athletes. Girls volleyball just edged girls lacrosse for the largest increase of any MHSAA-sponsored sport in 2015-16, jumping 7.8 percent with 19,395 athletes after three straight seasons of declining participation.

Other sports with increased participation in 2015-16 were girls cross country (0.6 percent to 8,403 athletes), girls golf (3.8 percent to 3,460), girls gymnastics (3.2 percent to 638), boys soccer (1.0 percent to 14,574), girls soccer (0.3 percent to 13,367) and girls tennis (0.5 percent to 8,675).

However, a few troubling trends did continue. Girls basketball participation fell for the 10th straight season, this time nearly a percent to 15,558 athletes, the sport’s lowest total since records first were kept in 1991-92. The latest decrease brings the total fall in participation to 18.7 percent in that sport since a U.S. District Court decision led to the switching of girls basketball season from fall to winter beginning in 2007-08. Comparatively, girls enrollment at MHSAA schools during that time has fallen 12.1 percent. Although volleyball, the sport that swapped seasons with girls basketball and moved to fall, saw a large increase in 2015-16, its total number of athletes still was the third-lowest for the sport since 1993-94 and its participation is still down 10 percent since the seasons changed.

Also of note in this year’s survey:

• The increase in participation for 15 sports with a decrease in 13 was compared to an increase for only eight and decrease for 20 in 2014-15. Those increases and decreases were split evenly across boys and girls sports last school year; this school year, six boys sports were up and eight were down in participation, while nine girls sports were up and only five saw decreases.

•  For the second straight year, a slight decrease in football participation fell in line with the slight decrease in boys enrollment after larger drops previously. Football participation was down 1.4 percent for the second straight year (and slowed this time a few hundredths of a percent, from 1.44 in 2014-15 to 1.42). The drop in football participation from 2011-12 to 2012-13 was 3.7 percent, and the drop from 2012-13 to 2013-14 was two percent.

•  Skiing saw the largest combined decrease among pairs of related sports, with boys participation down 7.2 percent to 719 and girls down 2.8 percent to 652 after both experienced increases a year ago. Swimming & diving experienced decreases for both girls and boys together for the second straight year, although this time the decreases were smaller than in 2014-15; girls were down 4.3 percent to 5,378 athletes and boys were down 4.2 percent to 4,732.

•  Boys golf participation fell for the seventh straight season, four percent to 6,271 athletes, its lowest total on record. Boys tennis experienced its seventh straight decrease to 6,077 athletes, also the lowest total on record for that sport and a dip of 3.6 percent from 2014-15.

•  Baseball, after three straight seasons of increases, was down just less than a percent this spring. Boys lacrosse, after setting a participation record in 2013-14, was down for the second straight year but this time by only six athletes, or one tenth of a percent. Girls track & field was down for the second straight year, by 1.5 percent, after three straight of increases.

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 2015-16 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

635/654/5

18,173

-

0/6

Basketball

728/735/4

21,509

653/722

15,558/15

Bowling

369/382/4

3,853

350/374

3,047/7

Competitive Cheer

-

-

336/350

7,062

Cross Country

615/641/1

9,252

597/636

8,403/2

Football - 11 player

595/627/81

38,500

-

0/92

8-player

47/49/1

927

-

1

Golf

497/532/42

6,197

334/340

3,460/74

Gymnastics

-

-

67/76

638

Ice Hockey

227/260/5

3346

-

0/6

Lacrosse

137/143/4

4,948

97/99

2,775/4

Skiing-Alpine

85/100/0

719

92/102

652/0

Soccer

474/497/15

14,526

456/477

13,367/48

Softball-Fast Pitch

-

-

612/639

13,788

Swimming & Diving

238/271/0

4,732

253/281

5,378/0

Tennis

293/309/3

6,065

331/344

8,675/12

Track & Field - Outdoor

662/686/0

22,803

646/685

16,611/0

Volleyball

-

-

708/719

19,395

Wrestling

463/480/130

9,396

-

0/205

(A) The first number is the number of schools reporting sponsorship on the Sports Participation Survey. The second number indicates schools sponsoring the sport including primary and secondary schools in cooperative programs as of May 7, 2016. The third 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 1,400 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.