Lindsey Straus Lindsey Straus   IN: What's New, Top Stories, Prevention & Risk Reduction, Effects of Concussion and Repetitive Head Impacts   Tagged: , , ,  
  • Lindsey Straus

    Author: Lindsey Straus is an award-winning youth sports journalist, practicing attorney, and has been Senior Editor of SmartTeams since its launch as MomsTEAM in August 2000. She can be reached at

  • Lindsey Straus

Most States Now Limit Number And Duration Of Full-Contact Practices in High School Football

Responding to concerns about the effect of repetitive head impacts in football, forty-six of fifty state high school athletic associations will begin the 2016 season with limits on full-contact practices in high school football, with only New Hampshire, Delaware, South Dakota, and Louisiana the only four states currently without any such restrictions.

A growing body of research (1-13) suggests that repetitive, sub-concussive head impacts sustained in sports may play a more important role than concussions in putting an athlete at risk of neurocognitive dysfunction later in life.  The research has led to calls by concussion experts and safety advocates that high school and youth football organizations minimize exposure to repetitive impacts by limiting the number of hits they sustain in a sports season, over the course of a year, and during a career, and by removing helmet-to-helmet contact from the game as much as possible, such as by teaching rugby-style, or heads-up tackling, or even by conducting some practices without helmets altogether. (14) 

The governing bodies at all levels of football have responded with breathtaking speed with rule changes.

In 2011, the Ivy League enacted a rule limiting to two the number of contact practices a team could conduct during the regular season, while the National Football League limited teams to a total of 14 contact practices during the regular season with a maximum of one per week during the first 11 weeks of the season.

In 2012, Pop Warner instituted rule changes  designed to limit contact during practices.

In 2013, state high school athletic associations in Arizona, Washington State, Iowa, and Texas moved to impose some limits on full-contact practices, while the Pac-12 joined the Ivy League in limiting regular season practices to two per week (No other major college football conference has followed suit, at least so far, although individual football programs have adopted limits informally).

2014 saw the NCAA issue new guidelines recommending that full-contact practices during the season be limited to two per week,  no more than four contact practices per week during the preseason and no more than eight of the 15 sessions during spring football, while the State of California passed a law limiting middle and high school to two full-contact practices – each no more than 90 minutes long – per a week during the 30 day period before the regular season and during the regular season itself, and banned off-season contact practices completely.

In advance of the 2014 season, a number of additional state high school athletic associations imposed contact practice limits, with Wisconsin prohibiting full contact during the first week of practice, limiting full contact to 75 minutes per week during week 2, and capping it at 60 minutes thereafter, and Michigan prohibiting high school football programs in the state, after the first regular season game, from conducting collision practices (which it defined as “live, game-speed, player versus player contact in pads involving any number of players”) on more than 2 days in any week.  Notably, the state high school athletic association’s executive director rules said that the rule was “really … where 85 to 90 percent of our coaches already were,” and enacted more to  “send a signal to that 10 to 15 percent to get on board with the rest of us to make football just as safe as it can possibly be.”

In November 2014, the National Federation of State High School Associations (NFHS) recommended to its member associations that they adopt limits on full-contact practices in high school football. 

In the months leading up to the 2015 fall season, some state associations adopted the NFHS recommendations exactly, while others altered them to more closely fit the needs of their member schools, with the state associations in Iowa, Kansas, Georgia and Tennessee opting to limit full-contact practice to 90 minutes a week and other states, such as Ohio, electing to limit full-contact to 60 minutes a week. Kansas banned “live action” the day after a game (a change made to address the issue of student-athletes playing a varsity game followed by a junior varsity game the next day).

In time for the 2016 football season, more states have jumped on the contact practice limit bandwagon, bringing the number of states with such limits, according to Terry O’Neil of the advocacy group, Practice Like The Pros, to 46. Florida now limits live contact during regular season and postseason practice  (defining live contact as “drills with game-like conditions where players are taken to the ground”) to no more than three days per week, 30 minutes per day and 80 minutes per week, and bans contact on more than two consecutive days). Effective with the 2016 season, high school football players in Kansas  will not be allowed to participate in games on consecutive days (a change was made to address the issue of student-athletes playing a varsity game followed by a junior varsity game the next day).  Pennsylvania now limits contact practice to 60 minutes per week.

Limits reduce impacts

The question then, is do the contact practice limits work?

If the question is whether they work to reduce the number of impacts, the answer appears to be yes, with several studies showing that limiting the amount of contact during football practices does reduce the number of impacts players sustain over the course of a season.

A 2013 study (15) by Steven Broglio and colleagues at the University of Michigan found that limiting contact practices in football to one session per week, or eliminating contact practices altogether, would lead to an 18% to 40% reduction in head impacts respectively over the course of a high school football season.

In a 2015 pilot study of college football players (14), researchers, including Broglio, also found that engaging in a 5-minute helmetless tackling drill twice a week during pre-season football and once a week during the season reduced by almost a third the frequency of impacts to the head over the course of a single season.

In 2016, Broglio reported that the 2014 rule change limiting full-contact high school football practices in Michigan to no more than two per week reduced head-impact exposure for all players by an average of 42%, with the largest reduction occurring among lineman, who also experienced a sharp decline in the number of impacts to the front of the helmet. (16)

Fewer practices, additional risk?

One thing scientists don’t know with any certainty is whether widespread adoption of limits on full-contact practices in football,  intended to make the game safer, has the perverse effect of creating additional risk of injury to players because they haven’t spent enough time learning to tackle properly.

A March 2013 review of current risk-reduction strategies in the British Journal of Sports Medicine (17) was careful to remind state high school athletic associations and legislatures that, in enacting limits on full-contact practices, they “need to carefully consider potential injury ‘trade-offs’ associated with the implementation of injury-prevention strategies, because every change may have certain advantages and disadvantages. That is, by reducing one risk or danger, additional risks may be created.” In other words, as the 2013 Michigan study points out, limits on full-contact practices could create additional risk of injury to players because they haven’t spent enough time learning to tackle properly.

While it is hard, in the absence of substantial research to draw any firm conclusions, the results of at least two recent studies, however, should help to allay those fears, suggesting that reductions in full-contact practices can be accomplished safely without putting players at additional risk, while researchers continue looking for the head trauma “holy grail”: a threshold – whether it is number of hits per week, over the course of the season, of a certain force, or to a certain part of the helmet  (e.g. facemask, top of the head) above which players are at an unacceptably high risk of permanent brain injury.

In the first, a 2013 study by researchers at Wake Forest Baptist Hospital and Virginia Tech (18) showed that reducing the number of head hits in practice did not, as some had predicted (19lead to higher force impacts during games.

More recently, a 2015 study (20) practice contact restrictions, such as implemented by Pop Warner, at least when implemented in conjunction with comprehensive coach education in teaching “heads up” tackling, was effective in reducing the rate of concussions in youth football.

Note, however, that both studies involved youth football players, who, on average, do not get hit as hard as high school, college, and pro players, and sustain, on average, far fewer impacts to the head over the course of a season to begin with (see chart below)

Promising signs

If the question is whether the contact practice limits work to limit concussion risk and long-term cognitive function, the answer is also that it is too early to tell, although preliminary research suggests that the answer with respect to reducing concussion risk is likely yes.  Research has yet to be conducted on the effect of contact practice limits on the long-term neurocognitive health of football players.

As Broglio said in his 2013 study,  while research suggests that contact sport athletes are likely at a greater risk for developing neurodegenerative diseases such as chronic traumatic encephalopathy and cognitive problems later in life,  we still don’t have research “indicating the relationship between head impacts, concussions, and other factors (eg. genetic profile) that may trigger the disease pathway.”  

Preliminary High School RIO injury surveillance data suggests that the new rules have resulted in a statistically significant decrease in concussion rates during practices in Texas, with similar results seen in Arizona, Maryland and Alabama after comparable changes were made to practice rules in those states.

A research paper (28) presented at the American Academy of Pediatrics (AAP) National Conference & Exhibition in Washington, DC in October 2015 by researchers at the University of Wisconsin-Madison reported that the rate of sports-related concussion sustained during high school football practice was more than twice as high in the 2012 and 2013 seasons as for the 2014 season for high school football when a rule went into effect in Wisconsin prohibiting full contact during the first week of practice in high school football, limiting full contact to 75 minutes per week during week 2, and capping it at 60 minutes thereafter.

Educated guesses

As for research on the effect of limits on full-contact practices on an athlete’s long-term cognitive function, there is none, leading  Broglio to conclude that the evidence surrounding long-term cognitive health as related to head impacts remained “inconclusive” at best.

Broglio agreed with those, including Dr. Robert Cantu, who believe that any trauma to the brain should be avoided, and that limits designed to reduce total trauma to the brain of an athlete are, by definition, a worthwhile step to take, finding such argument “logical” and “appealing.” 

While the restrictions on full-contact practices in football which have been implemented cannot be seen as anything but positive, there remains what Broglio characterized as a “lack of clarity surrounding the relationship between repeated head impacts in high school athletes and long-term neurocognitive dysfunction” that only additional research can remove.

As a result, Broglio, says that “until the risk factors for … CTE … are better defined by carefully designed and controlled research,” and research determines “what the advisable limit to head impact exposure should be,” employing contact limits as a way to reduce the risk of concussion and long-term brain injury will remain, as they have from the start, “educated guesses, at best.”

Head Impacts In American Football Per Season (21-27)

Age Average number of impacts
7 161
9-13 154
10-13 193
11-13 252
12-14 210-275

340 (1 season)

652 (per season over 4 seasons)


  1. Talavage T, Nauman E, Breedlove E, et. al. Functionally-Detected Cognitive Impairment in High School Football Players Without Clinically-Diagnosed Concussion. J Neurotrauma. 2010; DOI: 10.1089/neu.2010.1512.
  2. Bazarian JJ, Zhu T, Blyth B, Borrino A, Zhong J.  Subject-specific changes in brain white matter in diffusion tensor imaging after sports-related concussion.  Magnetic Resources Imaging. 2012; 30(2): 171-180.
  3. March N, Bazarian JJ, Puvenna V, Janigro M, Ghosh C, et. al. Consequences of Repeated Blood-Brain Barrier Disruption in Football Players. PLoS ONE 2013;8(3): e56805. doi: 10.1371/journal.pone.0056805.
  4. Breedlove EL, Robinson M, Talavage TM, et al. Biomechanical correlates of symptomatic and asymptomatic neurophysiological impairment in high school football. J Biomech. 2012;45(7):1265-1272.
  5. Talavage TM, Nauman EA, Breedlove EL, et al. Functionally-detected cognitive impairment in high school football players without clinically diagnosed concussion. J Neurotrauma. 2014;31(4):327-338. doi:10.1089/neu.2010.512.
  6. Breedlove KM, Breedlove EL, Robinson M, Poole VN, King JR, Rosenberger P, Nauman EA. Detecting neurocognitive & neurophysiological changes as a result of subconcussive blows in high school football athletes.  Ath. Tr. & Sports Health Care. 2014;6(3):119-127.
  7. Poole VN, Breedlove EL, Shenk TE, Abbas K, Robinson ME, Leverenz LJ, Nauman EA, Dydek U, Talavage TM.  Sub-concussive HIt Characteristics Predict Deviant Brain Metabolism in Football Athletes. Developmental Neuropsychology 2015;40(1):12-17, DOI:10.1080/87565641.2014.984810.
  8. Nauman EA, Breedlove KM, Breedlove EL, Talavage TM, Robinson ME, Leverenz LJ. Post-Season Neurophysiological Deficits Assessed By ImPACT and fMRI in Athletes Competing in American Football.  Developmental Neuropsychology. 2015;40(2):85-91. doi:10.1080/87565641.2015.1016161.
  9. Robinson ME, Shenk TE, Breedlove EL, Leverenz LJ, Nauman EA, Talavage TM.  The Role of Location of Subconcussive Head Impacts in fMRI Brain Activation Change. Developmental Neuropsychology 2015;40(2): 74-79. doi:10.1080/87565641.2015.101224.
  10. Shenk TE, Robinson ME, Svaldi DO, Abbas K, Breedlove KM, Leverenz LJ, Nauman EA, Talavage TM. fMRI of Visual Working Memory in High School Football Players.  Developmental Neuropsychology 2015;40(2):63-68. doi:10.1080/87565641.2015.1014088.
  11. Svaldi DO, Joshi C, Robinson ME, Shenk TE, Abbas K, Nauman EA, Leverenz LJ, Talavage TM. Cerebrovascular Reactivity Alterations in Asymptomatic High School Football Players.  Developmental Neuropsychology 2015;40(2):80-84. doi:10.1080/87565641.2014.973959
  12. Abbas K, Shenk TE, Poole VN, Robinson ME, Leverenz LJ, Nauman EA, Talavage TM. Effects of Repetitive Sub-Concussive Brain Injury on the Functional Connectivity of Default Mode Network in High School Football Athletes. Developmental Neuropsychology 2015;40(1):51-56. doi:10.1080/875665641.2014.990455.
  13. Chun IY, Mao X, Breedlove EL, Leverenz LJ, Nauman EA, Talavage TM. Detection of Longitudinal WM Abnormalities Due to Accumulated Head Impacts. Developmental Neuropsychology 2015;40(2):92-97. doi: 10.1080/87566541/2015.1020945. .
  14. Swartz EE, Broglio SP, Cook SB, Cantu RC, Ferrara MS, Guskiewicz KM, Myers JL. Early results of a Helmetless-Tackling Intervention to Decrease Head Impacts in Football Players. J Athl Tr. 2016;51(1). published online ahead of print December 2015)
  15. Broglio SP, Martini D, Kasper L, Eckner JT, Kutcher JS.  Estimation of Head Impact Exposure in High School Football: Implications for Regulating Contact Practices.  Am J Sports Med 2013;20(10). DOI:10.1177/036354651302458 (epub September 3, 2013).
  16. Broglio SP, Williams RM, O’Connor KL, Goldstick J. Football Players’ Head Impact Exposure After Limiting of Full-Contact Practices. J Ath Tr. 2016;51(7):000 (e-published ahead of print July 2016).
  17. Benson B, McIntosh A, Maddocks D, et. al. What are the most effective risk-reduction strategies in sport concussion? Br J Sports Med 2013;47:321-326.
  18. Cobb BR, Urban JE, Davenport EM, Rowson S, Duma SM, Maldjian JA, Whitlow CT, Powers AK, Stizel JD. Head Impact Exposure in Youth Football: Elementary School Ages 9-12 Years and the Effect of Practice Structure. Ann Biomed Eng ( 2013): DOI: 10.1007/s10439-013-0867-6 (online ahead of print)
  19. Kontos P, Fazio V, Burkart S, Swindell H, Marron J, Collins M. Incidence of Sport-Related Concussion among Youth Football Players Aged 8-12 Years. J Pediatrics 2013. DOI 10.1016/j.jpeds.2013.04.011
  20. Kerr ZY, Yeargin S, McLeod TC, Nittoli VC, Mensch J, Dodge T, Hayden R, Dompier TP. Comprehensive Coach Education and Practice Contact Restriction Guidelines Result in Lower Injury Rates in Youth American Football.  Orthopaedic J Sports Med. 2015;3(7). doi:10.1177/2325967115594578.
  21. Young TJ, Daniel RW, Rowson S, Duma SM. Head impact exposure in youth football: elementary school ages 7–8 years and the effect of returning players. Clin J Sport Med. 2014;24(5):416–421.
  22. Cobb BR, Urban JE, Davenport EM, et al. Head impact exposure in youth football: elementary school ages 9–12 years and the effect of practice structure. Ann Biomed Eng. 2013;41(12):2463–2473.
  23. Cobb BR, Rowson S, Duma SM. Age-related differences in head impact exposure of 9–13 year old football players. Biomed Sci Instrum. 2014;50:285–290.
  24. Munce TA, Dorman JC, Thompson PA, Valentine VD, Bergeron MF. Head impact exposure and neurologic function of youth football players. Med Sci Sports Exerc. 2015;47(8):1567–1576.
  25. Daniel RW, Rowson S, Duma SM. Head acceleration measurements in middle school football. Biomed Sci Instrum. 2014;50:291–296.
    13. Daniel RW, Rowson S, Duma SM. Head impact exposure in youth football: middle school ages 12–14 years. J Biomech Eng. 2014; 136(9):094501.
  26. Urban JE, Davenport EM, Golman AJ, et al. Head impact exposure in youth football: high school ages 14 to 18 years and cumulative impact analysis. Ann Biomed Eng. 2013;41(12):2474–2487.
  27. Broglio SP, Eckner JT, Martini D, Sosnoff JJ, Kutcher JS, Randolph C. Cumulative head impact burden in high school football. J Neurotrauma. 2011;28(10):2069–2078.
  28. Research paper, “Effect of New Rule Limiting Full Contact Practice on Incidence of Sport Related Concussion in High School Football Players.”  McGuine TA, Hetzel S, Brooks MA. Presented at American Academy of Pediatrics National Conference and Exhibition. October 24-27, 2015, Washington, D.C.


Related articles

Repetitive Impacts: A Major Concern At All Levels of Sports

Head Hits During Practice Can Be Safely Reduced in Youth Football, Study Suggests

Youth Football Concussion Study Criticizing Limits On Contact Practices As ‘Shortsighted’ Generates Controversy

Helmetless Tackling and Blocking Drills Lead To Decreased Impacts in College Football Players

Limiting Contact Practices In High School Football: Proceed With Caution, Study Concludes

NFHS Recommendation To Limit Full-Contact Practices In High School Football Adopted By Most States



  • September 2, 2016, 4:20 pm

    Thank you for this information and your concern to make football a safer and better game.
    Lee Becker
    Director, Football Safety Academy

    • Lindsey Straus
      Lindsey Straus
      September 12, 2016, 6:38 pm

      You are welcome, Lee.

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