Figure Skating
Roger J. Kruse
Jennifer Burke
SCOPE OF PARTICIPATION
The U.S. Figure Skating Association (USFSA), a member of the International Skating Union (ISU) and U.S. Olympic Committee (USOC), is the national governing body for figure skating and includes more than 740 member clubs and over 176,000 members (21).
DISCIPLINES
Singles skaters combine the highest level of athleticism and artistry. These skaters complete multirevolution jumps and spins with rapid footwork sequences, spiral sequences, and connecting moves.
Pairs skaters skate as a traditional couple, performing not only multirevolution jumps and spins, but also numerous high-risk maneuvers such as throw jumps and overhead lifts.
Ice dancers skate as a traditional couple, concentrating on speed, body lean, edges, and precise technique. The rules of the sport limit jumps, spins, and lifts, and partner separations.
Synchronized skating is a technical form of team skating characterized by speed, intricate formations, and transitions. It is currently the fastest-growing discipline in figure skating with approximately 570 registered teams nationally. Teams are typically composed of 16 skaters, most often female skaters.
COMPETITION
In the United States, the competition levels for men and women are preliminary, prejuvenile, juvenile, intermediate, novice, junior, senior, and adult. Participation in each level is generally determined not by age, but by accomplishment of the specific skill tests.
In competition, singles, pairs, dance, and synchronized skaters perform two programs, the components of which are dictated by level.
The short program varies in length with competition level, but not as a function of gender. Senior competitors perform required elements to music that cannot exceed 2 minutes and 40 seconds in length.
The long program is performed to music that for senior skaters cannot exceed 4 minutes and 30 seconds and is more difficult.
SPORT SCIENCE
Athlete Attributes
Physical
Figure skaters are generally shorter, lighter, and leaner than average (11,12). At the most elite levels, shortness, leanness, and linearity of physique are particularly noted in the female ice dancers and pair skaters. Most figure skaters are right-leg dominant, rotate counter-clockwise, and land on their right leg.
Physiology
Physiologic testing, including [V with dot above]O2max, flexibility, vertical jump, body composition, strength, and power evaluations, are useful in planning and monitoring training programs. Off-ice training and periodization of training are necessary in order to optimize these elements. While performing a program, a figure skater will reach 90%-100% of their maximal heart rate within 30-60 seconds and then sustain that level of intensity for the duration of the program. Figure skating can be compared to tennis with regard to the necessity of a well-developed anaerobic and aerobic energy system. The effort required for a long program in figure skating can be compared to running a 4-minute mile. The increasing complexity of the technical elements being performed in all disciplines of skating is approaching the acrobatics of gymnastics.
Nutrition
Skaters, particularly female figure skaters, eat with the goal of achieving or maintaining the lean athletic body type demanded by the sport. Female pair skaters must be lightweight for successful completion of increasingly complex lifts and throw jumps. Female ice dancers are judged on an aesthetically pleasing body line, particularly at higher levels of competition.
The most common dietary issues encountered are inadequate caloric intake and hydration, as well as suboptimal food choices and poor timing of nutrition (25,26).
Total energy intake and intake of dietary fiber and fat (females) are often below dietary recommendations.
Intake of some micronutrients, including vitamin D, vitamin E, magnesium, potassium, folate, pantothenic acid, phosphorous, and calcium, in females was shown to be less than two-thirds of the recommended daily allowance (6).
Approximately 50% of elite figure skaters use dietary supplements, with multivitamins being the most commonly consumed supplement (27).
Bone Mass
Prepubertal figure skaters’ bone mineral density of the spine and lower extremities has been shown to be significantly higher than in nonskaters, suggesting that intense weight-bearing exercise may protect bone mass in younger athletes, despite inadequate nutritional intake (19).
Postmenarchal skaters with a history of stress fracture do not typically have lower bone mineral density as compared to nonathletic controls but do have significantly lower bone mineral density compared to skaters without fractures (14).
Psychology
More than 85% of the most successful elite skaters are using sports psychology techniques year-round; almost every elite athlete in the United States uses visualization and imagery.
The abilities to concentrate and refocus are positive predictors of how well athletes will perform. Negative thinking and lack of emotional control are significant issues.
The relationship of the skater, parent, and coach is a very close one, and the treating physician must communicate with each to optimize treatment compliance and outcome. Addressing the psychological impact of an injury is very important to the recovery process.
As a team sport, team dynamics and team building in synchronized skating are integral to success and must be included in training programs.
Equipment
Boots and Blades
The skating boot is made primarily from leather. A skater’s ankles are plantarflexed in the skate due to the height of the boot heel. Some manufacturers make a boot with heat-molded parts in order to customize the fit.
The design of the skating boot has changed over the past 25 years. The boots have become increasingly stiff in response to requests from skaters and coaches to enhance support, slow break down, and accommodate skaters with suboptimal ankle strength and proprioception to improve jump landing success rates.
Over-the-counter or stock boots and blades are less expensive and less rigid and can be variable in construction. They are sold as a single unit, with the blade screwed or riveted to the boot. Most elite athletes wear stiff custom-made boots bought separately from the blades.
New skates and blades can cost well over $1,000 and are usually replaced every year. Skaters typically replace boots when the ankle support breaks down. Stock boots are available for half the price of custom-made boots but must be replaced more often.
More recently, to improve the biomechanical advantage of plantarflexion in performing jumps, to facilitate increasingly complex and technical elements, and to perhaps decrease injury rates, boot designs such as the “hinged boot” or articulated band lighter-weight synthetic boots have been introduced with mixed success. Off-ice analysis of skaters jumping using the articulated boots showed evidence of decreases in peak heel forces and loading rate. Analysis of on-ice jumps did not demonstrate the same decrease in landing forces (3). Most recently, inserts and blade mounting techniques are being introduced to help decrease/improve impact forces.
Optimal boot fit is necessary to prevent boot-related injuries. The boot should be lightweight (< 5% of skater’s body weight). It should have a broad forefoot, a well-fitted heel, and a well-padded tongue. New boots should be introduced at the end of the competitive season and never be worn alternately with old boots. There is little room in boots to accommodate orthoses, although increasingly, stock and custom options are commercially available. The plantarflexed position in which the boot holds the foot must be accounted for in orthotic construction.
Biomechanics
Jumps
Shoulder abductor strength and knee extensor strength are two main predictors of jump height (16). An athlete’s upper body strength and consequent ability to pull arms against centrifugal forces, attaining a tight air position, when initiating jump rotation are correlated positively with the athlete’s ability to perform the more difficult jumps.
To perform the increasingly difficult triple and quadruple jumps, the athletes are rotating faster, not necessarily jumping higher (7). Flight times for single, double, and triple jumps are very similar due to nearly identical vertical velocity at takeoffs (7). However, athletes who have mastered higher revolution jumps, such as triple and quadruple jumps, generate greater vertical velocity at takeoff of lower revolution jumps (9).
Impact forces are greater on landing higher revolution jumps as a result of delayed landing and the need for the athlete to forcefully extend his or her landing leg toward the ice from a shorter distance (9).
Spins
It is important to be aware that spinning typically requires a greater energy expenditure than jumping. The athlete rotates three to six revolutions per second, creating 200-300 pounds of centrifugal force (13), and when the athlete changes position during the spin, these forces can go up. Upper body,
lower body, and core strength are all required to keep the arms and legs close to the axis of rotation to counteract the centrifugal force.
Throws and Lifts
Pair skaters and ice dancers and, to a lesser degree, synchronized skaters are continuing to push technical boundaries and are increasingly performing more complex, creative, and acrobatic elements.
To perform the increasingly difficult throw double and triple twists, similar to triple and quadruple jumps, the pair teams use primarily increased rotational rates and, to a lesser degree, increased flight time due to delayed or lower catches (8).