A profile of injuries in athletes seeking treatment during a triathlon race series.

BACKGROUND: Triathlon combines swimming, cycling, and running into a single event. With increasing popularity of this sport, there has been a rise in the number of participants, particularly in shorter distance races. However, the risks of participating in short-distance races have not been reported. PURPOSE: To describe the rate and profile of injuries seen for medical assistance during a triathlon race series. STUDY DESIGN: Descriptive epidemiology study. METHODS: A standardized injury reporting form was used to collect information from race entrants seeking medical aid at each of the races comprising a combination of Sprint, Olympic, and Fun race distances in a triathlon series in Victoria, Australia over the 2006-2007 race season. Injury rates and risk factors were assessed via regression analysis. RESULTS: There were 10,197 individual starters who took part. There were 235 presentations for medical assistance (n = 322 injuries) over the series. The presentation rate was 20.1 per 1000 hours of competition (2.3% of total race starts). Injuries were predominantly sustained during the run (38.4%) and cycle (14.3%) legs. Lower limb injuries (59.5%) and abrasions (28.6%) were the most common site and nature of injury, respectively. There were 9 severe injuries: 5 fractures, 3 probable heat stroke cases, and 1 deep laceration. Elite/Junior Elite, Olympic distance, and 12- to 19-year-old competitors were at higher risk of injury, especially during running and cycling. CONCLUSION: The level and age of triathlon competitors, and the race distance, influenced the risk of injury over a race series. These results provide timely information for triathlon race event organizers and could be incorporated into a review of practices for the provision of medical services to triathlon events, especially the common sprint distance competitions. CLINICAL RELEVANCE: Shorter distance triathlons have lower injury rates and relatively minor injuries, but medical teams and race organizers should be prepared for serious injuries.

The incidence of heat casualties in sprint triathlon: the tale of two Melbourne race events.

Triathlon is a popular participation sport combining swimming, cycling and running into a single event. The Triathlon Australia medical policy advocates the use of wet bulb globe temperature as the criterion for altering race distance and an ambient temperature of 35 degrees C as a criterion for consideration of cancellation of an event, but there is little empirical evidence detailing the effectiveness of this policy. Nor has the impact of environmental thermal stress on triathletes in shorter duration events been determined. During an injury surveillance investigation of a triathlon race series over the 2006/2007 seasons, two events with similar environmental conditions were completed. One thousand eight hundred and eighty-four participants competed in event 1 (December 2006) and 2000 competed in event 2 (February 2007). Maximum dry bulb (DBT), minimum vapour pressure (VP) and minimum relative humidity (RH) for event 1 were 37 degrees C DBT, 0.56 kPa VP and 9% RH measured by the Bureau of Meteorology. Fifty-three participants presented for medical aid, 15 due to heat-related collapse. The conditions measured for event 2 were 33 degrees C DBT, 1.16 kPa VP and 24% RH and there were no heat illness presentations despite 38 individuals presenting for medical aid. These observations suggest that the risk of heat-related collapse is greatest when high-environmental temperatures occur early in the competitive season when participants may be inadequately prepared and have not yet acquired natural acclimatisation to heat. Any Triathlon Australia policy revision could place stronger emphasis on the use of ambient temperature as a limiting criterion for race organisers.

Characteristics of anterior cruciate ligament injuries in Australian football.

Anterior cruciate ligament (ACL) injuries are the most costly injuries in football at both professional and amateur levels (Orchard J, Seward H, McGivern J, Hood S. Intrinsic and extrinsic risk factors for anterior cruciate ligament injury in Australian footballers. Am J Sports Med 2001;29:196-200.). In this study video analysis of 34 ACL injuries in Australian football was performed to investigate the causes of these injuries. Factors that may have contributed to the cause of the injury were analysed, rated and reported. The factors analysed were: type of manoeuvre, direction the knee 'gave way', running speed, knee angle, cutting angle and if the player was accelerating or decelerating. The majority of the injuries analysed occurred in non-contact situations (56%). Of these 37% occurred during sidestepping manoeuvres, 32% in landing, 16% land and step, 10% stopping/slowing and 5% crossover cut manoeuvres. Ninety-two percent of the non-contact injuries occurred at extended knee angles of 30 degrees or less, which is also commonly known to place stress on the ACL and reduce the protective role of hamstrings. Over half (54%) of non-contact injuries occurred whilst decelerating. It would be expected that greater speed and angle cut too would increase the frequency of ACL injury. The results could not confirm this with most injuries occurring at running speeds of slow jogging to running and equal number of injuries occurred at cutting to angles of the ranges 15-45 degrees and 45-75 degrees. These results give greater understanding into potential causes or contributors of ACL injury and information to assist in the development of knee injury prevention programs.