Engaging in racquet sports such as tennis, squash, and badminton requires a complex interplay of dynamic muscles, acute coordination, and powerful force production. Understanding the biomechanics underlying these sports is crucial for enhancing athletic performance, preventing injuries, and informing rehabilitation approaches. This article will break down the three essential stages of play in racquet sports: the preparatory phase, the execution phase, and the follow-through. It will highlight the physical forces impacting the athlete, the involvement of particular muscle groups, and common injuries characteristic of each stage.
Following this, we will delve into specific Motion Specific Release (MSR) techniques aimed at mitigating restrictions and correcting imbalances within these vital anatomical structures. First, let's briefly review the three stages of racquet sport movements.\
Article Index
Introduction
Specific Upper Body Muscles
Motion Specific Release
Conclusion & References
Three Stages of Racquet Sports
The Preparatory Phase
The preparatory stage is the foundation of the stroke, involving the strategic positioning of both the body and the racquet in anticipation of the approaching ball. This phase sees a symphonic engagement of muscles from the upper body, core, and lower extremities to establish the ideal posture. While the forces produced in this phase are comparatively modest, the precision of the stance is critical, as it forms the basis for the active execution phase. Injuries during this period often stem from incorrect form or muscle imbalances, resulting in strains or sprains, especially around the shoulder and wrist areas.
The Execution Phase
In the execution phase, the actual stroke comes to life. It encompasses a swift, synchronized series of muscle contractions that create the necessary force to propel the racquet to meet the ball. The forces unleashed in this phase far exceed those in the initial stage, imposing increased demands on the body’s structural integrity. Frequently encountered injuries during this phase are tennis elbow (lateral epicondylitis), sprains in the wrist, and injuries to the rotator cuff, usually due to the repetitive nature of forceful strokes and insufficient recovery time."
The Follow-Through Phase
This phase is characterized by slowing down the body and racquet post-stroke, managing residual kinetic energy, and setting up for the subsequent action. Muscles that were active in the stroke engage in eccentric contraction to decelerate the involved body segments effectively. Concurrently, antagonist muscles activate to govern the motion and ensure joint stability. Improper handling of the forces at play during this stage can contribute to repetitive stress injuries, especially in the shoulder and elbow regions."
Specific Upper Body Muscles
Research indicates that key muscle groups engaged throughout the three critical stages of racquet sports can be categorized into upper body, core, and lower body segments. Understanding the primary structures at play is essential for injury prevention and performance enhancement in racquet sports. This discussion will focus on the predominant upper body structures and the indicators of restriction, imbalance, or other issues within these specific muscles.
Pectoral Muscles
The pectoralis major and minor are key to stroke power and control in racquet sports, extending from the torso to the humerus and scapula. Problems with these muscles can reduce stroke strength, alter technique, and limit reach, increasing the risk of related injuries and affecting balance and stability crucial for optimal performance.
In a player with restrictions or imbalances in the pectoral muscles, the following palpatory and visual clues might be observed during racquet sports:
Palpatory Clues:
Asymmetry in Muscle Tone: One side may feel tenser or have more developed musculature compared to the other.
Tenderness upon Palpation: There may be tender spots or trigger points in the pectoral muscles, indicating areas of tightness or overuse.
Restricted Range of Motion: Upon movement of the shoulder girdle, there might be a noticeable limitation in flexibility or a difference in range between the two sides.
Altered Muscle Firing: The practitioner might notice a delay or decreased intensity in the contraction of the pectoral muscles on the affected side.
Visual Clues:
Altered Posture: Rounded shoulders or a forward-thrust head posture may suggest tightness in the pectoral muscles.
Compensatory Movements: The player might use excessive wrist or arm movements during strokes to compensate for the lack of stability or power from the pectoral muscles.
Decreased Stroke Efficiency: A reduced range or power in the serve or forehand could be a visual indicator of pectoral dysfunction.
Uneven Scapular Movement: During the preparatory or follow-through phases, one scapula might move differently from the other, suggesting an imbalance.
Deltoid Muscles
The deltoid muscles, originating from the clavicle, acromion, and spine of the scapula and inserting into the humerus, are crucial to power and control in racquet sports. Innervated by the axillary nerve, they're essential for stroke intensity and ball direction. Deltoid issues can lead to reduced power, altered technique, discomfort, limited reach, and potential compensation injuries in the shoulder girdle, elbow, or wrist.
When assessing a player for restrictions or imbalances in the deltoid muscles during racquet sports, you might encounter the following palpatory and visual clues:
Palpatory Clues:
Asymmetry in Muscle Bulk: One deltoid may appear less developed or feel softer upon palpation, indicating atrophy or less usage.
Tenderness and Trigger Points: The presence of tender areas or palpable nodules within the deltoid muscle could suggest localized stress or microtrauma.
Resistance to Passive Movement: When moving the arm passively, there might be increased resistance or a lack of fluidity, especially in abduction, which heavily involves the deltoid.
Temperature Changes: An increase in local temperature or inflammation could be palpable over the deltoid muscle, indicating overuse or strain.
Visual Clues:
Altered Stroke Mechanics: The player may display limited abduction or a lack of control in the stroke, particularly in overhead actions.
Uneven Arm Swing: One arm may swing less fully or with apparent discomfort, suggesting issues with the deltoid on that side.
Scapulohumeral Rhythm Disruption: There might be an observable disruption in the normal movement pattern between the shoulder blade and the humerus.
Compensatory Upper Body Movements: The player may use more trunk rotation or other upper body parts to compensate for the lack of function in the deltoid.
Rotator Cuff Muscles
The rotator cuff muscles, including the supraspinatus, infraspinatus, teres minor, and subscapularis, originate from various parts of the scapula and insert into the humerus. The suprascapular, axillary, and subscapular nerves innervate them. These muscles stabilize the shoulder and enable powerful strokes in racquet sports. Issues with the rotator cuff can lead to pain, reduced power, altered technique, limited range of motion, and potential compensation injuries.
For a player with restrictions or imbalances in the rotator cuff muscles during racquet sports, you may observe the following palpatory and visual clues:
Palpatory Clues:
Muscle Tenderness: Upon palpation, there may be tenderness in the rotator cuff muscles, which could indicate inflammation or strain.
Irregular Muscle Tone: Differences in muscle tone between the affected and unaffected shoulders, with possible atrophy in the involved rotator cuff muscles.
Reduced Strength: Notable weakness during manual muscle testing, especially in movements like internal and external rotation of the shoulder.
Crepitus or Clicking: Sensations of grating, clicking, or popping within the shoulder joint during palpation or movement.
Visual Clues:
Guarded Movements: The player may exhibit protective behavior, such as holding the arm close to the body, especially after strokes.
Limited Shoulder Elevation: Difficulty or an inability to fully elevate the arm during serves or overhead shots, which can signify rotator cuff limitations.
Compensatory Techniques: Over-reliance on elbow and wrist movements during strokes to make up for the lack of shoulder stability and strength.
Asymmetric Shoulder Position: One shoulder may appear lower or differently positioned compared to the other, suggesting muscle imbalance.
These palpatory and visual signs would signal a need for further clinical evaluation to determine the extent of the rotator cuff involvement and guide appropriate therapeutic interventions.
Forearm Flexors and Extensors
Forearm Flexors
Forearm Flexors include the flexor carpi radialis, flexor carpi ulnaris, and flexor digitorum superficialis, spanning from the upper arm to the hand. Governed by the median and ulnar nerves, issues with these muscles can result in weaker grip, pain, technique changes, and restricted wrist flexion.
Forearm Extensors
The extensor group, consisting of the extensor carpi radialis longus, brevis, and the extensor carpi ulnaris, attaches from the upper arm bones to the hand bones and is controlled by the radial nerve. Complications with these muscles may lead to diminished wrist control, discomfort, technique modifications, restricted wrist extension, and possible compensatory injuries.
For a player with restrictions or imbalances in the forearm flexors and extensors during racquet sports, the following palpatory and visual clues could be observed:
Palpatory Clues:
Muscle Tightness: The forearm muscles may feel tight to the touch, and there could be distinct areas of muscle hardness or knots, particularly in the flexors, which are prone to overuse.
Tenderness: There might be specific tender points along the muscle belly or at the musculotendinous junctions of the flexors and extensors.
Trigger Points: Palpable trigger points can be indicative of chronic stress or microtrauma in these muscle groups.
Pain on Resistance: Pain or discomfort might be elicited when the player resists wrist flexion or extension, suggesting strain or fatigue in these muscles.
Visual Clues:
Altered Grip Strength: The player may exhibit compromised grip strength, seen as a difficulty in firmly holding the racquet or a tendency for the racquet to twist upon impact with the ball.
Changes in Wrist Mechanics: There may be observable changes in how the wrist is used during play, such as excessive flexion or extension to compensate for pain or weakness in the forearm muscles.
Compensatory Arm Movements: In an effort to reduce the load on the forearm muscles, the player might use more arm or shoulder movement.
Swelling or Inflammation: Visible swelling or signs of inflammation around the forearm could be indicative of acute or chronic injury to the flexors or extensors.
These clues would warrant a more in-depth assessment, possibly including strength testing, range of motion measurements, and special tests to confirm the diagnosis and to form a management plan for rehabilitation and return to play.
Intrinsic Hand Muscles
The intrinsic hand muscles, essential for controlling the racquet, comprise the lumbricals, interossei, and the thenar and hypothenar groups. The lumbricals and interossei enable finger movements and stem from the hand's deep flexor tendons and metacarpal bones, while the thenar and hypothenar muscles, originating from the wrist bones, are key for grip strength and adjusting the racquet's angle. Powered by the ulnar and median nerves, these muscles are vital in racquet sports. Dysfunctions can cause control loss, pain, grip changes, restricted finger mobility, and possibly lead to compensatory injuries.
For a player with restrictions or imbalances in the intrinsic hand muscles during racquet sports, the following palpatory and visual clues may be observed:
Palpatory Clues:
Muscle Tenderness: Localized tenderness upon palpation of the intrinsic hand muscles could indicate overuse or strain.
Reduced Muscle Bulk: Atrophy or decreased muscle bulk in the thenar (thumb) or hypothenar (little finger) eminences could be indicative of chronic imbalance or nerve involvement.
Trigger Points: Palpable nodules or bands within the muscles of the hand, suggesting localized points of chronic stress.
Restricted Finger Movement: Difficulty or pain when the player attempts to flex or extend the fingers during manual testing could point to intrinsic muscle dysfunction.
Visual Clues:
Altered Grip on the Racquet: The player may hold the racquet differently, such as gripping too tightly or not enough, due to pain or weakness in the hand muscles.
Compensatory Wrist Movement: There might be an increase in wrist movement during strokes to compensate for the lack of fine motor control from the hand muscles.
Finger Position Abnormalities: Abnormal positioning of the fingers, like clawing or flattening, during rest or play could suggest intrinsic muscle issues.
Grip Fatigue: The player might show signs of early fatigue in the hands, having difficulty maintaining a consistent grip over time.
Identifying these clues can help in recognizing players who may be experiencing dysfunction in the intrinsic hand muscles, leading to targeted examination, potential nerve conduction studies, or other diagnostic evaluations to determine the exact nature of the issue and to formulate an appropriate treatment strategy.
Motion-Specific Release (MSR) - Demonstration Video
Applying targeted MSR procedures can significantly mitigate injuries and enhance performance in racquet sports. In the subsequent video, Dr. Abelson illustrates potent techniques for alleviating restrictions in the key upper extremity muscles engaged during these activities.
Conclusion - Racquet Sports - Part 1
In conclusion, mastery and optimization in racquet sports demand a deep understanding of the biomechanical orchestra at play, involving muscles across the upper body, core, and lower extremities. This article has dissected the phases of racquet sports - preparatory, execution, and follow-through - to illuminate the forces, muscular engagement, and common injuries that athletes face. Furthermore, we've identified critical muscle groups and the signs that indicate imbalances or restrictions, providing insight into the preventative and corrective measures necessary for peak performance.
Our exploration of MSR techniques represents a bridge between recognizing musculoskeletal issues and addressing them effectively, with the aim of preserving the athlete’s health and enhancing their game. By closely observing the nuanced palpatory and visual clues outlined, practitioners and players alike can foster a proactive approach to injury prevention and skill advancement. With this knowledge, the path towards athletic longevity and success becomes a well-navigated journey.
DR. BRIAN ABELSON DC. - The Author
Dr. Abelson's approach in musculoskeletal health care reflects a deep commitment to evidence-based practices and continuous learning. In his work at Kinetic Health in Calgary, Alberta, he focuses on integrating the latest research with a compassionate understanding of each patient's unique needs. As the developer of the Motion Specific Release (MSR) Treatment Systems, he views his role as both a practitioner and an educator, dedicated to sharing knowledge and techniques that can benefit the wider healthcare community. His ongoing efforts in teaching and practice aim to contribute positively to the field of musculoskeletal health, with a constant emphasis on patient-centered care and the collective advancement of treatment methods.
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References
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Pluim, B. M., Staal, J. B., Windler, G. E., & Jayanthi, N. (2006). Tennis injuries: occurrence, aetiology, and prevention. British journal of sports medicine, 40(5), 415-423.
Abrams, G. D., Renstrom, P. A., & Safran, M. R. (2012). Epidemiology of musculoskeletal injury in the tennis player. British journal of sports medicine, 46(7), 492-498.
Ellenbecker, T. S., & Roetert, E. P. (2003). Age specific isokinetic glenohumeral internal and external rotation strength in elite junior tennis players. Journal of Science and Medicine in Sport, 6(1), 63-70.
Roetert, E. P., Ellenbecker, T. S., & Reid, M. (2009). Biomechanics of the tennis groundstrokes: implications for strength training. Strength & Conditioning Journal, 31(4), 41-49.
Roetert, E. P., & Kovacs, M. (2011). World-class tennis technique. Human Kinetics.
Reid, M., Schneiker, K. (2008). Strength and conditioning in tennis: Current research and practice. Journal of Science and Medicine in Sport, 11(3), 248-256.
Ellenbecker, T. S., & Roetert, E. P. (2004). An isokinetic profile of trunk rotation strength in elite tennis players. Medicine & Science in Sports & Exercise, 36(11), 1959-1963.
Elliott, B. (2006). Biomechanics and tennis. British Journal of Sports Medicine, 40(5), 392-396.
Kibler, W. B., Chandler, T. J., Shapiro, R., & Conuel, M. (2007). Muscle activation in coupled scapulohumeral motions in the high performance tennis serve. British Journal of Sports Medicine, 41(11), 745-749.
Martin, C., Bideau, B., Bideau, N., Nicolas, G., Delamarche, P., & Kulpa, R. (2014). Energy flow analysis during the tennis serve: comparison between injured and noninjured tennis players. The American Journal of Sports Medicine, 42(11), 2751-2760.
Roetert, E. P., Ellenbecker, T. S., & Brown, S. W. (2014). Biomechanics of advanced tennis. International Tennis Federation.
Vasudevan, J. M., Logan, A. J., Shultz, R., Koval, J. J., Roh, E. Y., & Fredericson, M. (2016). Comparison of Muscle Onset Activation Sequences between a Golf or Tennis Swing and Common Training Exercises Using Surface Electromyography: A Pilot Study. Journal of Sports Medicine, 2016, 3987486.
Elliott, B. (2006). Biomechanics and tennis. British Journal of Sports Medicine, 40(5), 392–396.
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