INJURIES AND ILLNESSES AMONG IRON-DISTANCE
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1 INJURIES AND ILLNESSES AMONG IRON-DISTANCE TRIATHLETES, A PROSPECTIVE STUDY Christian A. Andersen Oslo Sports Trauma Research Center Norwegian School of Sport Sciences PB 4014 Ullevål Stadion 0806 Oslo, Norway Tel: Fax: c.a.andersen@nih.no Ben Clarsen Oslo Sports Trauma Research Center Norwegian School of Sport Sciences Oslo, Norway Tone V. Johansen Oslo Sports Trauma Research Center Norwegian School of Sport Sciences Oslo, Norway Lars Engebretsen Department of Orthopaedic Surgery Oslo University Hospital and Faculty of Medicine University of Oslo Oslo, Norway Short title: Injuries and illnesses among iron-distance triathletes Key words: Triathlon, Epidemiology, Sporting injuries, Lower extremity injuries, Soft tissue injuries Word Count: 2267 Number of references: 20
2 ABSTRACT Background Triathlon is an increasingly popular sport at both the elite and the recreational level. However, there have been few high-quality studies of injuries and illnesses among triathletes. Objective To register overuse problems and acute injuries among iron-distance triathletes throughout a training season leading up a major event. Methods A 26-week prospective cohort study was conducted including 174 participants of the 2011 Norseman Xtreme Triathlon. Data on overuse injuries located in the shoulder, lower back, thigh, knee and lower leg were collected every second week using the OSTRC Overuse Injury Questionnaire. Illnesses, acute injuries and overuse problems affecting other anatomical areas were also recorded using standard injury surveillance methods. Results The average prevalence of overuse problems was 56% (95% CI: 51-61) (490 cases). The average prevalence of substantial overuse problems was 20% (95 % CI: 18-21) (165 cases). The most prevalent sites of overuse problems were the knee (25%), lower leg (23%) and lower back (23%). The acute injury incidence was 0.97 injuries per 1000h of training (36 cases) and 1.02 injuries per 1000h of competition (5 cases). A majority of moderate and severe acute injuries were located at the knee, shoulder/clavicle and sternum/ribs. The predominant types of acute injuries were contusions, fractures and sprains. Conclusion Overuse problems constitute the majority of injury cases among iron-distance triathletes. The most prevalent sites of injury in the present study were the knee, lower leg, lower back and shoulder. Future injury prevention studies in iron-distance triathletes should focus on these areas.
3 INTRODUCTION Triathlon is a competitive sport consisting of swimming, bicycling and running. Since its incipience in the late nineteen-seventies, triathlon has grown into a popular endeavour among recreational and elite athletes, and it has been an Olympic sport since Common race distances include sprint distance (750m swim, 20km bike and 5km run), standard or Olympic distance (1500m swim, 40km bike and 10km run), and long distance (300m swim, 80km bike and 20 km run). In recent years there has been a particular increase in the popularity of ultra-distance triathlons (3.8km swim, 180km bike and 42.2km run), also commonly known as ironman or iron-distance triathlons. However, little is known about the extent to which iron-distance triathletes suffer from injury and illness. This is important information as it represents the first step in the sequence of prevention research. 1 2 Previous studies of injuries in triathlon have been limited by a retrospective study design or by a short duration and small sample size. Inconsistent injury definitions have also been used, making it difficult to compare and interpret results. 3 According to Gosling et al, 3 this represents a gap in the knowledge needed to develop informed injury prevention strategies, thereby reducing the burden of triathlon related injury. To our knowledge, there have been no previous epidemiological studies of illness in triathlon. The objective of this 26-week prospective cohort study was to record the magnitude and severity of injuries and illnesses among triathletes preparing for a major iron-distance triathlon event. A new methodology for the registration of overuse injuries has been used, 4 5 in addition to standard surveillance methods. 6 METHODS Inclusion All athletes who registered for participation in the 2011 Norseman Xtreme Triathlon (n=274) were contacted by and invited to participate in the study. Norseman Xtreme Triathlon is an iron-distance event held annually in Norway with participants from all over the world. Information about the study was published on the organiser s website and in the online consent form that participants were required to complete. The study was approved by the Norwegian Data Inspectorate and reviewed by the South-Eastern Norway Regional Committee for Research Ethics.
4 Data collection procedure Every second Sunday for the duration of the 26-week data collection period, online survey software (Questback V. 9692, Questback AS, Oslo, Norway) was used to send each participant an linking them to an injury questionnaire (described below). Athletes who failed to respond within five days received an automatic reminder . Questionnaire The Oslo Sports Trauma Research Center (OSTRC) Overuse Injury Questionnaire was used to collect data on injuries located in the shoulder, lower back, thigh, knee and lower leg. 5 These areas were selected for specific study as previous studies of triathlon injuries have suggested lower limb, back and shoulder to be the most common sites of injury among irondistance triathletes. 3 In addition to questions on injury, athletes were asked to register the total training volume (hours) and training volume in each discipline (swim, bike, run). In order to be able to provide accurate information, athletes were encouraged to keep a daily record of their training and injuries/physical complaints. The number of days of total time loss was registered for each problem reported. The complete questionnaire is available as an online supplement to this paper. Severity score A severity score of was calculated for each anatomical area each time a questionnaire was completed. 5 This score was monitored over the duration of the study and the average score was calculated for all reported cases. Acute injury registration At the end of the questionnaire, athletes were asked to record all physical complaints they had experienced in the previous two-week period, regardless of the injury s consequence or whether they had already given information on the same problem in earlier questions. The nature of onset was recorded for each complaint and those that could be linked to a specific injury event (e.g. a collision or fall) were classified as acute injuries. These injuries were reported according to the consensus statement on injury definitions and data collection procedures in studies of football (soccer) injuries. 6 If an acute injury had been sustained in the shoulder, lower back, thigh, knee or lower leg, data corresponding to these injuries that were obtained through the overuse injury questionnaires were separated in the database.
5 Illness registration Athletes were asked whether or not they had suffered from illness during the previous twoweek period. Illnesses were defined as any health problems that were not related to the musculoskeletal system, for example respiratory tract infections, influenza or gastrointestinal infections. The number of days of time-loss was recorded for all cases. Data analysis All data were compiled in a database created with Microsoft Excel software (Microsoft Excel 2010, Microsoft Corporation, Washington, USA). At the conclusion of the study a final classification of illness and injury cases was performed based on the total information obtained from each athlete over the 26 weeks. The rate and severity of overuse injuries was reported for each anatomical area according to the OSTRC methodology. 5 Measures included the average prevalence of all overuse problems, the average prevalence of substantial overuse problems (defined as those leading to moderate or severe reductions in training volume, or moderate or severe reduction in sports performance, or complete inability to participate in sport) and the average severity score. The number, severity and incidence of acute injuries, and overuse injuries affecting anatomical areas other than the shoulder, lower back, thigh, knee and lower leg, were reported using standard methods. 6 Illnesses were reported using the same methodological approach, but without any system-specific classification. RESULTS Participant characteristics The participant characteristics are summarised in table 1. The average male athlete had been generally active in sports for 23 years (95% CI: ). The female athletes reported an average of 18 years (95% CI: ) experience from active sports. Forty per cent of the female and 36% of the male athletes were training for their first iron-distance race. Within the cohort 16 athletes were classified as elite as they had qualified for the event through seeding. There were no female elite athletes in the study.
6 Table 1. Participant characteristics Gender Age (years)* Height (cm)* Weight (kg)* Triathlon experience (years)* Number of completed IM- distance races* Male (n = 143) 39 (8) 182 (6) 80 (14) 5.0 (5.5) 2.4 (3.2) Female (n = 31) 36 (9) 170 (5) 63 (6) 3.3 (2.9) 2.1 (3.2) Total (n = 174) 38 (9) 180 (7) 77 (15) 4.7 (5.1) 2.4 (3.2) * Values are mean (SD) Response rate The average response rate to the electronic questionnaire distributed every second week throughout the course of the study was 87% (SD 4). Of the 174 subjects who were included in the study, 112 (64%) completed all thirteen questionnaires. There were no significant differences between the responders and the dropouts, except for years of triathlon experience (5 years (SD 5.3) versus 3 years (SD 3.2) respectively, p=0.02) and number of completed iron-distance races (2.6 (SD 3.4) versus 1.5 (SD 2.1), p=0.02). Training habits On average, athletes spent 276 hours in training during the 26-week study period (95% CI: ). On average, athletes trained for 11.1 hours per week (95% CI: , range: ). Of this, 1.4 hours per week was spent swimming (95% CI: , range: 0-5.2), 5.8 hours cycling (95% CI: , range: ) and 2.9 hours running (95% CI: , range: ). Over the course of the 26-week project, 48% of the total training time was spent on cycling, 24% on running, 12% on swimming and 16% on other training such as weight lifting, skiing or other activities. Overuse injuries The average prevalence of overuse injury problems in any anatomical location was 56% (95% CI: 51-61). The average prevalence of substantial overuse injury problems was 20% (95 % CI: 18-21). The average prevalence and severity score for the 5 different anatomical regions is shown in table 2.
7 Table 2. Average weekly prevalence of all overuse problems and of substantial problems, and average weekly severity score Shoulder Lower back Thigh Knee Lower leg (88 cases) (84 cases) (88 cases) (106 cases) (106 cases) Average weekly prevalence (all problems) # 20 (16-23) 23 (21-25) 12 (10-14) 25 (21-29) 23 (20-26) Average weekly prevalence (substantial problems) # 4 (3-5) 4 (3-5) 3 (3-4) 7 (6-8) 7 (5-8) Average weekly severity score 27 (24-29) 26 (24-28) 28 (27-30) 30 (28-32) 32 (30-34) Substantial problem: Overuse problem causing moderate/severe reductions in training volume or sports performance, or complete inability to participate in training or competition # Values are shown as percentages with the 95% confidence interval in parentheses. Eighty-seven per cent of the entire cohort reported some form of overuse problem at some point during the 26-week study, and more than half reported substantial problems. On average, those athletes with shoulder problems reported problems 42% (95% CI: 35-49) of the time throughout the course of the study. Athletes with knee problems reported problems 44% (95% CI: 38-50) of the time. Those with lower back problems reported problems 46% (95% CI: 39-53) of the time. Athletes with lower leg problems reported problems 47% (95% CI: 40-54) of the time, whereas those with thigh problems reported problems 34% (95% CI: 27-42) of the time throughout the course of the study. Overuse problems affecting other anatomical areas than the shoulder, knee, lower back, thigh or lower leg are shown in table 3. Table 3. Location and severity of other overuse problems Slight Minimal Mild Moderate Severe (0 days) (1-3 days) (4-7 days) (8-28 days) (>28 days) Total Neck/cervical spine Elbow Thoracic spine/upper back Hip and Groin Ankle Foot/toe Total Acute injuries Forty-one acute injuries resulting from either training or competition were registered during the 26-week study. The acute injury incidence was 0.97 injuries per 1000h of training (36 injuries) and 1.02 injuries per 1000h of competition (5 injuries). Seventy-eight per cent of the training related acute injuries occurred while training in primary sport (swim, bike or run), while the remaining 22 % resulted from alternative training. The predominant types of injuries were contusions (17%), fractures (10%) and sprains (10%). Location and severity of
8 acute injuries is listed in table 4. Table 4. Location and severity of acute injuries Minimal Mild Moderate Severe (1-3 days) (4-7 days) (8-28 days) (>28 days) Total Head and Face Shoulder/Clavicle Elbow Forearm Finger Sternum/ribs Lumbar spine/lower back Hip and groin Thigh Knee Lower leg Ankle Foot/toe Total Illness There were 156 cases of illness reported during the study period, affecting 104 athletes (60% of the cohort). The average prevalence of illness was 11% (95% CI: ). Nine per cent of all cases did not lead to any time loss, 34% were of minimal severity (1-3 days of time loss), 36% were mild cases (4-7 days), 19% were of moderate severity (8-28 days) and 3% of all cases were of more than 28 days severity. DISCUSSION This is to our knowledge, the first prospective cohort study of injuries and illnesses among iron-distance triathletes. The major findings were that, at any given time during the course of the study, more than half the cohort were suffering from some form of overuse problem, and one in five had overuse injuries causing a moderate to severe reduction in training participation or sports performance, or complete inability to train (substantial overuse
9 problems). Five specific anatomic areas were investigated in this study; the shoulder, lower back, thigh, knee, and lower leg. While overuse complaints were prevalent in all locations, the knee and lower leg were the areas with the highest prevalence of substantial problems. A total of 87% of the entire cohort reported some form of overuse problem at some point during the 26-week study, and more than half reported substantial problems. This suggests that the magnitude of overuse problems in iron-distance triathletes is high, supporting the conclusions of previous reports However, as we have used a new method of collecting and expressing injury data, our results are not directly comparable with previous triathlon studies. The current study has certain limitations. Firstly, we have collected information on the illness and injury patterns of triathletes preparing for a specific event, and the extent to which these athletes are representative of all iron-distance triathletes remains unknown. However, we are unaware of any reason for why this cohort should differ substantially from other groups of iron-distance triathletes, particularly given the diversity of nationalities represented in the event. Secondly, as we collected data on all physical complaints, a certain percentage of reported problems may have been normal pain associated with heavy training, for example delayed-onset muscle soreness after weight lifting. We were unable to perform a confirmatory medical examination of each reported problem and therefore lack detailed diagnostic information on each case. However, previous studies using these methods have found that 17% of reported problems had no consequence other that mild pain, 5 and 30% were diagnosed with the injury type non-specific pain according to the Orchard Sports Injury Classification System (OSICS-10). 18 In addition to the area-specific questionnaires, injuries were also registered using standard surveillance methods, in which a more open form of questioning was used. Using this method, only 18 overuse injuries affecting other anatomical regions than our 5 main areas of interest were identified. This may partly be due to the differences in methodology applied, as general questioning has a tendency to lead to fewer cases of overuse problems being identified compared to specific questioning on predefined anatomical areas. 19 However, it seems reasonable to conclude the 5 anatomical areas we specifically studied covered a majority of the overuse injuries affecting the cohort. Ankle/foot/toe injuries have previously been reported to constitute between 9% and 35% of all injuries sustained by triathletes, thus being the second most common site of injury in the lower limb We found, however, ankle/foot/toe injuries to account for only 3% of all our recorded injuries. Acute injury data were reported consistent with current consensus methodology In contrast to previous reports, 3 we found a low incidence of acute injuries related to triathlon
10 competition (1.0 injuries per 1000 h of competition). In comparison, previous studies have reported up to 17.4 injuries per 1000 hours of competition. 15 The most likely explanation for this discrepancy is that previous studies have included all injuries, including exacerbations of pre-existing overuse conditions, in their incidence measures. In contrast, due to the prospective design of this study we were able to identify and eliminate pre-existing conditions from incidence calculations. No epidemiological studies have reported illnesses among triathletes. Our findings suggest that the prevalence of illness is considerably lower than that of injury. However, due to the current lack of reference data and standardised methodology for recording and reporting illnesses in surveillance studies, a more in-depth analysis of our findings is not possible. CONCLUSION The prevalence of overuse problems in iron-distance triathletes is high, whereas the acute injury incidence appears to be lower than previously reported. The incidence of acute injuries did not differ between training and competition. The findings of this study suggest that overuse problems constitute the majority of injury cases in iron-distance triathletes, with the most prevalent sites of injury being the knee, lower leg, lower back and shoulder. Future injury prevention studies in iron-distance triathletes should focus on these areas. What are the new findings The majority of injury cases in iron-distance triathletes are due to overuse. The incidence of acute injury is low in iron-distance triathlon for both training and competition. The knee, lower leg, lower back and shoulder are the most prevalent sites of overuse injury in iron-distance triathletes, and future injury prevention studies should focus on these areas. How might it impact on clinical practice in the near future This paper introduces a new methodology for overuse injury registration in triathlon injury surveillance, which may lead to progress in the field of triathlon injury epidemiology. The results from the present study shed new light on the burden of triathlon related injury, and may contribute to future informed development of injury preventive strategies.
11 Acknowledgements The authors would like to thank Hardangervidda Triatlon Klubb, the organizer of Norseman Xtreme Triathlon, for their assistance in recruitment of subjects and promotion of the project. We would also like to thank the athletes for their patience and faithful reporting throughout the study period. The Oslo Sports Trauma Research Center has been established at the Norwegian School of Sport Sciences through generous grants from the Royal Norwegian Ministry of Culture, the South-Eastern Norway Regional Health Authority, the International Olympic Committee, the Norwegian Olympic Committee & Confederation of Sport, and Norsk Tipping AS.
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