Resumen de Upper-Body Strength Endurance and Power Norms in Healthy Collegiate Dancers: A 10-year Prospective Study
Sarah M. Coogan, Jena Hansen-Honeycutt, Victoria Fauntroy, Jatin P. Ambegaonkar
Dance is physically demanding and requires dancers to have adequate upper body (UB), core, and lower-body fitness to perform successfully. 50-85% of dancers suffer injury during a performance season. Although a large number of dancer's injuries are to the lower body, several dance genres (e.g., modern, hip hop, and salsa) use UB motions such as partner lifts and holds, which may result in a higher risk for UB injury. Health care practitioners often use baseline physical performance normative values to determine their clients' fitness levels and when planning training programs to prevent or rehabilitate postinjury. Still, little information exists regarding UB fitness norms among collegiate dancers. Thus, our purpose was to determine UB strength endurance and power norms in healthy collegiate dancers. We recorded UB muscular fitness in 214 healthy collegiate dancers (males: n = 26, 174.0 +/- 6.7 cm, 71.3 +/- 9.2 kg and females: n = 188, 163.0 +/- 6.1 cm, 59.3 +/- 6.8 kg) prospectively over a 10-year period (2008-2018) in a dance program that emphasizes modern and ballet dance. For UB strength endurance, we recorded the number of push-ups a dancer was able to perform without forcibly straining or losing form for 2 consecutive repetitions. For UB power, dancers sat with legs outstretched, backs flat against a wall, and threw a 3-kg ball horizontally from their chest as far as possible (distance thrown normalized to body height, *BH). The best attempt of 3 trials was used for statistical analyses. We report descriptive statistics, interquartile ranges (IQRs), and percentiles for both outcome measures. Dancers performed 20.4 +/- 10.6 (range: 2-70, IQR: 12-24; males: 32.5 +/- 14.4; females: 18.4 +/- 8.4) push-ups and threw the medicine ball 1.8 +/- 0.5 *BH (range: 45-3.9, IQR: 1.4-2.1; females: 1.7 +/- 0.5; males: 2.3 +/- 0.7). Overall, in this long-term prospective study, we developed UB fitness norms for dancers. The push-up test and medicine ball throw test are simple, low-tech, and inexpensive to test dancers UB fitness. Although dancers' UB muscular fitness was lower than previous reports among traditional sport athletes, these values may not necessarily indicate problems, as subjects were all healthy collegiate-level dancers. Rather, our findings reinforce the need to develop dance-specific norms so that practitioners can use these values to assess dancers' UB fitness and devise interventions appropriately. These results provide baseline UB muscular fitness norms among collegiate modern and ballet dancers, and further support the notion that differing norms are needed for different sports and dance genres. Specifically, future researchers should similarly develop norms across different dance genres for preprofessional and professional dancers and also examine whether these norms can predict dancers' injury risk or performance.
