The Science of the Comeback: How Sports Medicine is Rewriting the Rules on Postpartum Return-to-Play

For decades, pregnancy in elite athletics was treated as a career-ending injury—a biological event to be hidden from sponsors and rushed through in secret. Today, the global governing body of track and field is attempting to rewrite that narrative with hard data. On Tuesday, World Athletics officially launched the Childbirth And Return in Elite Sport (CARES) project, a landmark scientific initiative designed to replace outdated assumptions with evidence-based policy. The announcement marks a critical turning point for women's sports, signaling an institutional commitment to understanding the physiological realities of motherhood rather than penalizing them.[1][2]

The CARES project represents a fundamental shift in how sports science approaches the maternal body. Rather than relying on generic guidelines designed for recreational exercisers, the initiative will combine a retrospective analysis of performance metrics with comprehensive surveys of elite athletes. The goal is to understand the precise physiological, structural, and financial barriers women face when returning to competition. By gathering this data directly from the athletes, researchers hope to build a robust evidence pack that can dictate future medical protocols and organizational support systems.[1][5][6]

“When I started my career, you didn't want to tell your sponsors if you got pregnant because you might get dropped,” said Valerie Adams, Chair of the World Athletics Athletes' Commission and a mother of two. The new initiative, backed by World Athletics President Sebastian Coe, seeks to ensure that athletes who experience pregnancy are protected, receive adequate support, and do not face systemic barriers when returning to the track. Adams noted that fostering an open dialogue about motherhood is the first step toward dismantling the stigma.[1][5]

The scientific gap that CARES aims to fill is vast and historically neglected. For years, sports medicine has offered elite women little more than guesswork when it comes to prenatal training. A 2016 consensus statement from the International Olympic Committee (IOC) explicitly noted the lack of high-quality evidence specific to pregnant elite athletes, particularly regarding the safety and impact of high-intensity training. Researchers at the time concluded that the extreme doses of exercise required for Olympic-level performance were fundamentally unstudied in pregnant populations, leaving a void in clinical best practices.[4]

Because most existing medical guidelines are tailored toward the general population—typically recommending 150 minutes of moderate-intensity aerobic activity per week—elite athletes who routinely exceed these thresholds have been left to navigate their pregnancies in the dark. Many have reported finding the medical advice they received during pregnancy to be unsatisfactory, overly cautious, or entirely inapplicable to their physiological baseline, forcing them to rely on trial and error. This lack of tailored guidance has historically increased the risk of both undertraining and overtraining during gestation.[3][4][8]

However, recent sports science is beginning to reveal that the postpartum body is not just capable of returning to baseline—it may actually be primed for improvement. A 2025 study published in Frontiers in Sports and Active Living tracked Canadian elite athletes who became pregnant during their careers. Of those who returned to competitive sport, four out of five reported achieving an improved level of performance postpartum. While researchers noted that the sample size was small and called for broader data collection, the findings challenge the long-held assumption that childbirth permanently diminishes athletic capacity.[3]

Physiologists point to the profound cardiovascular adaptations that occur during pregnancy as a potential mechanism for this performance boost. The body naturally increases blood volume by up to 50 percent to support the developing fetus, a physiological change that some sports scientists liken to a natural, legal form of blood doping. While these specific cardiovascular adaptations eventually normalize after childbirth, the psychological resilience, increased pain tolerance, and altered biomechanics developed during the postpartum return often translate into lasting competitive advantages on the track.[3][4]

Despite these promising physiological realities, the structural environment of elite sport remains hostile to mothers. A 2025 scoping review of international sport federation policies found that many organizations place a high burden on athletes to navigate their own return, with significant anxiety surrounding contracts, sponsorships, and international rankings. The review highlighted that athletes frequently feel internal and external pressure to return to competition prematurely, driven by the fear of losing their livelihood or their hard-earned position in the global hierarchy.[8]

In individual sports like track and field, a prolonged absence can completely decimate an athlete's world ranking, which in turn dictates their lane assignments, qualification status for major championships, and overall earning potential. The CARES project specifically asks athletes to weigh in on potential mechanisms to freeze or protect world rankings during maternity leave. Implementing a standardized ranking protection policy could fundamentally alter the economics of women's sports, removing the financial penalty currently associated with starting a family.[1][2][8]

Some international federations have already begun to lead the way in establishing these protections. FIFA, the global governing body for soccer, introduced landmark regulations entitling women players to 14 weeks of paid absence, with at least eight weeks mandated following childbirth, while receiving two-thirds of their contracted salary. Crucially, FIFA also remains one of the few sports organizations to explicitly protect athletes from club termination due to pregnancy, setting a baseline that advocates hope World Athletics and the IOC will eventually adopt.[8]

In the absence of top-down guidance from governing bodies, independent research groups have started building their own evidence packs to support athletes right now. The Stanford Female Athlete Science and Translational Research (FASTR) Program recently published a comprehensive “Postpartum Guide for the Elite Runner”. This specialized resource offers concrete, evidence-based protocols on progressive musculoskeletal reloading, pelvic floor stability, and the careful monitoring of nutritional parameters and blood biomarkers during lactation, bridging the gap between obstetrics and sports performance.[7]

These clinical guidelines emphasize that returning to elite sport is a highly individualized process that requires multidisciplinary care, rather than a one-size-fits-all timeline. The complex interplay between cardiovascular fitness, bone reloading, and the immense metabolic demands of breastfeeding means that the traditional “six weeks of rest” advice is often dangerously inadequate for athletes attempting to return to Olympic-level training. Researchers stress that while early high-impact return is possible, it must be meticulously managed to prevent stress fractures and pelvic floor dysfunction.[7]

The cultural shift toward embracing motherhood in sport is also being driven powerfully by the athletes themselves. Kenyan distance runner Faith Kipyegon, who has broken multiple world records and won global titles after the birth of her daughter, recently launched a maternity facility in her home village to support local women. Her unprecedented success on the track has become an undeniable proof-of-concept that motherhood and athletic dominance are not mutually exclusive, inspiring a new generation of runners to demand better support systems from their federations.[1]

To build the ultimate dataset, the CARES surveys—which remain open until September—are divided into two distinct tracks: one for athletes who have experienced pregnancy since 2019, and another for those who have not. By capturing the perspectives of women who may have delayed or entirely avoided pregnancy due to career fears, World Athletics hopes to quantify the invisible toll of the sport's current structure. This dual approach ensures that the resulting policy will address both the physical realities of childbirth and the psychological barriers of family planning.[1][2][5]

Ultimately, the evidence gathered by the CARES project over the next year will serve as the foundation for a new era of sports policy. As rigorous data finally replaces outdated dogma, the narrative is shifting from how elite athletes can merely survive pregnancy, to how sports science can fully support the athlete-mother's pursuit of the podium. For the first time, the global athletics community is treating maternal health not as a liability, but as a critical component of human performance.[1][2][3][6]