The relationship between age and baseball pitching kinematics in professional baseball pitchers
Introduction
The baseball pitching biomechanics of adults have been extensively studied (Barrentine et al., 1998; Dillman et al., 1993; Elliott and Grove, 1986; Feltner and Dapena, 1986; Fleisig et al., 1995, Fleisig et al., 1996; MacWilliams et al., 1998; Matsuo et al., 2001; Pappas et al., 1985, Pappas et al., 1995; Sakurai et al., 1993; Stodden et al., 2005; Vaughn, 1985; Werner et al., 1993). These studies have shown that baseball pitching is a highly demanding task, and proper pitching mechanics are very important in preventing pitching injuries and improving or maintaining performance. A previous study (Fleisig et al., 1999) of baseball pitching among various levels of development revealed that adult pitchers did not demonstrate different position or temporal patterns than younger pitchers. All the kinetic variables that were analyzed increased significantly with competition level, which was most likely due to increased strength and muscle mass in the higher-level athletes.
Aging changes the physical capacities and therefore the performance of athletes considerably. In a study of track and field athletes, Fung and Ha (1994) found that the running, jumping, and throwing events most affected by age were the 400-m run, long jump, and javelin, respectively. There are systematic relationships between the age of peak performance and specific athletic events. Stones and Kozma (1984) developed a second-order polynomial model to quantitatively describe the relationship between age and performance in track and field events. The model fit the data very well and accounted for approximately 81% of the mean variances. Schulz and Curnow (1988) found that performance in swimming, sprinting, jumping, and tennis tended to peak in the early to mid-20s, whereas performance in long-distance running, baseball, and golf peaked in the late 20s and early 30s. In major league baseball players, the athletic performance on key indicators (e.g., ERA, Strikeouts) rises relatively quickly from age 19 to a peak age of 27 and declines gradually thereafter (Schulz et al., 1994).
The age of professional baseball pitchers ranges from late teens to mid-40s. Even though some researchers have investigated the relationship between age and pitching performance in major league baseball pitchers (Schulz et al., 1994) and the pitching biomechanics among various development levels (Fleisig et al., 1999), the variations in pitching mechanics of professional baseball pitchers among different ages are still unknown. Therefore, the purpose of this study was to investigate the differences of pitching kinematics between two different age groups of professional baseball pitchers. We hypothesized that kinematic variables will be significantly affected by age.
Section snippets
Methods
Sixty-seven professional baseball pitchers were tested in an indoor laboratory. All participants had no previous history of neuromusculoskeletal disorders. The average age of the subjects was 23.7±3.3 years (range 18.8–34.4). Those subjects older than one standard deviation above the mean (>27.0 years) were categorized into the “older group”, and those subjects younger than one standard deviation below the mean (<20.4 years) were defined as the “younger group”. There were 12 subjects in the
Results
The average age of the older group was approximately 10 years older than that of the younger group. There was no significant difference between the two groups in body height, body weight, and ball velocity. Players in the older group played at higher levels (Table 1). In fact, an analysis of date-of-birth data provided on Major League Baseball's website (www.mlb.com) showed that the mean age of the older group in this study (29.5) was very similar to the mean age of current Major League
Discussion
In all, 6 out of 14 position variables were found to be significantly different between the two groups: stride length, upper trunk and pelvis orientation angles at lead foot contact, maximum shoulder external rotation angle during arm cocking phase, and lead knee angle and trunk forward tilt angle at ball release. The joint range of motion of the human body has been demonstrated to degrade with age among both the general population (Allander et al., 1974; Barnes et al., 2001; Clarke et al., 1975
Acknowledgments
This study was supported in part by funding from Smith & Nephew, Inc.
References (38)
- et al.
The effects of age, sex, and shoulder dominance on range of motion of the shoulder
Journal of Shoulder and Elbow Surgery
(2001) - et al.
Kinematic and kinetic comparison of baseball pitching among various levels of development
Journal of Biomechanics
(1999) - et al.
Normal range of joint movements in shoulder, hip, wrist and thumb with special reference to side: a comparison between two populations
International Journal of Epidemiology
(1974) - et al.
Shoulder range of motion characteristics in collegiate baseball players
Journal of Sports Medicine and physics fitness
(2001) - et al.
Kinematic analysis of the wrist and forearm during baseball pitching
Journal of Applied Biomechanics
(1998) - et al.
Three-dimensional evaluation of the kinematic release parameters for javelin throwers of different skill levels
Journal of Applied Biomechanics
(1996) - et al.
Shoulder motion and laxity in the professional baseball player
American Journal of Sports Medicine
(1997) - et al.
Upper extremity range of motion and isokinetic strength of the internal and external shoulder rotators in major league baseball players
American Journal of Sports Medicine
(1988) - et al.
Preliminary studies in measuring range of motion in normal and painful stiff shoulders
Rheumatology and Rehabilitation
(1975) - et al.
Osseous adaptation and range of motion at the glenohumeral joint in professional baseball pitchers
American Journal of Sports Medicine
(2002)
Biomechanics of pitching with emphasis upon shoulder kinematics
Journal of Orthopaedic & Sports Physical Therapy
Glenohumeral joint total rotation range of motion in elite tennis players and baseball pitchers
Medicine and Science in Sports and Exercise
A three-dimensional cinematographic analysis of the fastball and curveball pitches in baseball
International Journal of Sport Biomechanics
Kinematic comparisons of throwing different types of baseball pitches
Journal of Applied Biomechanics
Dynamics of the shoulder and elbow joints of the throwing arm during a baseball pitch
International Journal of Sport and Biomechanics
Kinetics of baseball pitching with implications about injury mechanisms
American Journal of Sports Medicine
Kinematic and kinetic comparison between pitching and football passing
Journal of Applied Biomechanics
Changes in track and field performance with chronological aging
International Journal of Aging and Human Development
Glenohumeral joint: internal and external rotation range of motion in javelin throwers
Britain Journal of Sports Medicine
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