Sports Kinetics & Injury Prevention
Sports Kinetics & Injury Prevention
JML | REVIEW
Authors Affiliation
1. Department of Physical Therapy, College of Applied Medical Sciences, Imam Abdulrahman Bin Faisal University, Dammam,
   Kingdom of Saudi Arabia
  ABSTRACT
  The kinetic chain refers to the body's intricate coordination of various segments to perform a specific activity in-
  volving precise positioning, timing, and speed. This process is based on task-oriented and activity-specific pre-pro-
  grammed muscle activation patterns enhanced by repeated practice. It demands muscular eccentric strength, joint
  flexibility, and musculotendinous elastic energy storage. The body core (lumbopelvic–hip complex) forms the kinetic
  chains’ central point of activities in most sports because it facilitates load transfers to and from the limbs. The kinetic
  chain relationship with fascia, peripheral nerves, and tensegrity is fundamental to holistic human body movements.
  The kinetic chain function demands neuromuscular, sensorimotor, and neurocognitive control. Any blockage or de-
  fect in the kinetic chain can develop compensatory patterns, high demands on distal parts, and overuse and overload
  injuries. Taking a holistic approach and evaluating the integrity of the kinetic chain in athletes can significantly en-
  hance efforts to improve sports performance and mitigate injury risk.
  fascial connections among muscles play a significant role in main-            Repetitive movements, a common requirement in nearly all
  taining the stability of the human skeleton [13, 14].                      sports, can impact the fascia surrounding overused muscles, caus-
     Muscles tend to work synergistically, functioning as bigger an-         ing it to shorten and thicken while elongating in other areas [28].
  atomical interlinked chains [15]. Myofascial chains are distinct           Muscles execute movements in kinetic chains, although the muscle
  muscle groups united by the fascial system [12]. The superficial           function is not usually tested in its kinetic chain [29, 30]. Isolat-
  back line (one of the myofascial chains) involves the plantar fascia,      ed tests do not examine the movement patterns related to kinetic
  Achilles tendon, triceps surae, hamstrings, sacrotuberous ligament,        chains [31]. The full functionality of fascia in a specific chain is
  and erector spinae [16] that can facilitate effective force transmis-      manifested by permitting all the muscles to activate and hold the
  sion between the core and limbs through its anatomical integration         body in the chain test position [31]. Myofascial chain restrictions
  [17]. The thoracolumbar fascia connects the lower limbs (through           are manifested as the inability to hold the position and/or discom-
  its attachment with the gluteus maximus) and the upper limbs               fort in keeping the position [31].
  (through its attachment with the latissimus dorsi) [18], permitting
  the core to help in coordinated kinetic chain movements, such as           Kinetic chain and bio-tensegrity
  throwing [19]. The thoracolumbar fascia attaches to the transverse
  abdominus and internal oblique muscles, offering the lumbar spine             Human movement is multisystemic and complex [1]. Under-
  three-dimensional support and core stability [19]. It forms a stabi-       standing how these systems interact in human movement can
  lizing ‘ring’ surrounding the abdomen, made of the thoracolum-             enhance our understanding of injury causes, prevention, and
  bar fascia, the abdominal fascia, and the oblique muscles, acting          rehabilitation [1]. This perspective views human movement as
  like a stabilizing corset [20]. In addition, the thoracolumbar fascia      a holistic, interconnected, complex system rooted in bio-tenseg-
  channels load transmissions between the limbs and core [21].               rity [1]. Bio-tensegrity is a concept where the bones are joined/
     In the lower limb, the long head of the biceps femoris is in conti-     linked with multiple viscoelastic myofascial chains with mus-
  nuity with the sacrotuberous ligament, which in turn is connected          cle tone maintained in a tension-dependent manner [1]. The
  to the thoracolumbar fascia [11]. Research has shown that when             tensegrity concept can explain how the human kinetic chain is
  the biceps femoris tendon is pulled laterally, it can displace the         interconnected and interdependent [13, 17]. Tensegrity con-
  interspinous ligament between the fifth lumbar vertebra and the            cepts regard the musculoskeletal system as a series of elements
  first sacral vertebra, highlighting the load-transferring role of these    that resist compression (i.e., the bones) and are interconnected
  fascial connections even between distant body areas and joints             by a continuous network of viscoelastic elements (i.e., the mus-
  [11]. A dissection study has revealed various continuous fascial           culotendinous system), which provides constant elastic tension
  connections between the pelvis and the feet, including the iliotib-        within the system, both at rest and during movement [13, 32,
  ial band, femoral intermuscular septa, crural fascia, and crural           33]. The design of the bio-tensegrity system is evident in the
  intermuscular septa [22]. These fascial connections can transfer           continuous adjustments made by the entire musculoskeletal sys-
  loads between the pelvis and the feet [23]. Passive neural tissue can      tem, creating global patterns during movements [1]. The visco-
  also influence the transfer of load between the pelvis and the low-        elastic myofascial muscle chains function within a bio-tensegrity
  er limb [23]. For instance, higher tension in the sciatic and tibial       design that emphasizes the importance of addressing human
  nerves was observed when hip flexion and ankle dorsiflexion were           movement holistically [1]. The influence of whole-body posi-
  combined [24]. Similarly, the combination of hip flexion with the          tioning on the range of motion of a single joint illustrates the
  knee in an extended position (i.e., long sitting) led to the greatest      kinetic chain's function through the myofascial muscle chain [1].
  reduction in ankle dorsiflexion [23]. Moreover, knee joint range of
  motion (ROM) is reduced when hip flexion and ankle dorsiflexion            The kinetic chain and the core
  are combined [25]. Since no single muscular structure passes the
  lower limb joints, non-muscular structures (i.e., fascia and neural           The core (lumbopelvic–hip complex) forms the kinetic chains’
  tissues) can alter/control forces working on distal joint mechanics        central point of activities in most sports and is essential in injury
  [23]. In a sitting position with trunk rotation, significant differences   risk mitigation [18]. Core stability is the capability to control
  in ankle dorsiflexion ROM can occur due to the tensile force gen-          the trunk alignment and movement over the pelvis and lower
  erated by trunk rotation being transmitted to the contralateral dis-       limbs to permit optimal force and motion generation, transfer,
  tal end, thereby altering ankle dorsiflexion ROM [26]. This trans-         and control to the distal part in an integrated kinetic chain [18].
  mission or propagation of tensile force is facilitated through the         Therefore, core stability is crucial to enhance athletic function
  myofascial chain and the posterior oblique sling, particularly the         efficiency by maximizing the function of the upper and lower
  one connecting the trunk with the contralateral triceps surae [26].        limbs’ kinetic chains.
     The concept of integrated kinetic chain asserts that muscular              The kinetic chain involves the sequential activation of muscles
  chains/pathways are interlinked through soft tissue viscoelastic           while performing a specific task, relying on pre-programmed
  envelopment of polyarticular myofascial chains. The myofascial             patterns of muscle activation that are enhanced by repetition
  chains can transfer force, provide sensory and neuromotor input,           [18]. Muscle activation patterns associated with fast upper-limb
  and act like organized muscle synergies. The viscoelastic myofas-          movement reveal that the contralateral gastrocnemius/sole-
  cial chains work within the model of bio-tensegrity, necessitating         us are activated first [34], and then the activation reaches up
  eccentric function, end-range motions, joint stability, and elastic        (through the core) to the arm [35]. In baseball throwing, the
  energy storage. In a study published in 2017, the authors utilized         muscle activation for pitching starts from the contralateral exter-
  essential myofascial chain/pathway concepts to provide a compre-           nal oblique and continues up to the upper limb [35].
  hensive illustration of how ROM measurements at a single joint                The trunk/core muscle activation patterns enhance the mus-
  (specifically, the hip joint) depend on the positioning of the entire      cle activation patterns of the limbs in both stability and mobility,
  body in postures mimicking those encountered during sports activ-          while the distal muscle activity tends to be more specialized for
  ities, particularly those related to football [27].                        precision tasks [18]. Core muscle activation is pivotal in gener-
ating rotational torques around the spine, typically initiating on     proximal-to-distal energy flow from the trunk to the lower limb
the contralateral side to produce force and rotational movement        to execute angular motions to contact the ball. The strategies
[35, 36]. Furthermore, core muscle activation provides stiffness       involved in whole-body energy transfer during instep kicking in-
to the torso, forming a base against which limb musculature can        clude energy absorption by the support limb, the formation of
be stabilized while contracting [20, 36].                              an eccentric 'tension arc' between the torso and kicking hip, and
   Core proximal activation is essential for facilitating coordinat-   its concentric release, along with proximal-to-distal sequencing
ed movements of distal segments [18]. Core proximal activation         of the kicking limb during the downswing [49]. In maximal in-
provides the precision and stability for the whip-cracking-like        step soccer kicking, skilled athletes exhibited greater trunk rota-
upper extremity distal segment maximal force (e.g., when throw-        tion range of motion and speed, resulting in higher ball velocity
ing a ball, the core muscles stabilize the trunk to give the need-     compared to novice athletes [50].
ed base for the arm to throw the ball with force and precision).          For baseball pitching to occur, a complex muscle activation se-
The upper extremity distal part is smaller than the proximal part      quence along the kinetic chain generates and efficiently transfers
and, therefore, has a minimal moment of inertia, which allows          the required energy for executing a baseball throw [51]. The ki-
higher velocity summation. Consequently, the combination of            netic chain influences the activation of the scapular musculature
core activation and hand minimal moment of inertia can allow           (serratus anterior) throughout the practice of knee push-up-plus
the ball to be thrown with high precision, power, and acceler-         exercises. Electromyography studies have demonstrated that
ation [18]. The core also helps control force. In kicking, max-        ipsilateral lower-limb extension amplifies the activation of the
imum force at the foot is generated by the propagated moment           serratus anterior, whereas contralateral lower-limb extension re-
after the hip joint flexion [3]. The periscapular and core mus-        duces its activation [52]. Consciously contracting the abdominal
cle activation represents almost 85% of the muscle activation          muscles was an effective strategy to magnify the serratus anterior
needed to control the forward-moving upper limb [37]. It was           and lower trapezius activity (as proven by the electromyographi-
found that tennis players with lower knee flexion ROM during           cal readings) during the push-up plus phase [53].
the back-swing phase of the serve action had 23–27% greater               Efficient energy transfers involve the sequential transfer of
shoulder rotation, horizontal adduction stress, and elbow valgus       energy from the larger and more proximal parts of the body to
stress [38]. The possible explanation was that the lower knee          the smaller terminal parts [49]. Efficient energy transfers along
flexion ROM caused breakage in the kinetic chain and less con-         the kinetic chain were linked to a lower risk of injury and higher
tribution from the hip and core [38].                                  performance [49] because a synchronized kinetic chain can re-
                                                                       duce joint loads, enhance velocity, and increase force production
Kinetic chain and sports performance                                   throughout the motion [54]. Higher-level players use shoulder
                                                                       and wrist power better by effectively engaging the entire body
   Sports performance depends on relevant kinematic and kinet-         kinetic chain [55]. This power generation process during throw-
ical variables [39]. Sports performance improvement is correlat-       ing starts in the lower limbs and core, where large and powerful
ed with injury prevention [39]. The kinetic chain refers to the        muscles are located [56]. Around half of the force production
sequential activation of task-specific body segments, enabling         throughout the throwing motion occurs in the hip and trunk
efficient generation, summation, and transfer of mechanical en-        [51]. The lower-limb-generated force is transferred through the
ergy to support functional movement patterns [40, 41]. Kinetic         trunk to the scapula of the throwing/accelerating arm [51]. Mo-
chain inefficiency occurs when there is a defect or disruption at      bility restriction and kinematics alteration in the hip and trunk
any point within the chain, which affects the transfer of energy       are linked to a throwing mechanics breakdown (loss of energy
or force to nearby segments [40, 41]. The defect in the kinetic        production) and shoulder and elbow injuries [57, 58]. The mo-
chain places additional demands on the remaining segments of           bility restriction causes a loss of energy production and conse-
the chain to compensate for the energy loss [40]. This compen-         quent larger force production role on the arm, placing abnormal
sation has been identified as a contributing factor that increases     and damaging stresses on the soft tissues [51, 59, 60].
the risk of shoulder pain and injury during overhead sports ac-
tivities [40, 42]. In the dominant tasks of the upper extremity,       Kinetic chain and sports injuries
the energy generation and production are in a proximal-to-dis-
tal sequenced pattern [43]. For example, during a tennis serve,           Sports injuries are complex phenomena due to the interplay of
approximately 50%–55% of the total required kinetic energy             various risk factors or predictors (known as the risk profile) that
is generated from the legs and trunk [41, 44]. In elite handball       can lead to compensatory patterns and eventual injuries [7]. The
players, the main determinant of the throwing velocity is the          ability to predict and prevent sports injury depends on identifying
lower-limb peak power [45]. Moreover, lower limb peak power            these risk patterns (risk profile) through a non-linear and complex
was strongly correlated with the sprint-swim speed in freestyle        system approach [7]. In the kinetic chain, disruptions at proximal
swimmers [46]. Furthermore, lower limb musculature mass and            links can increase demands on more distal segments, requiring
contraction velocity correlate significantly with the performance      enhanced functional abilities in those areas and making them
of javelin throwing [47].                                              more susceptible to injuries [39, 61, 62].
   The muscle activation sequence in striking and throwing skills         Deficits in the kinetic chain links in the trunk and lower limbs
follows a proximal-to-distal direction. The "tension arc" travels      were present in approximately 50% of cases involving injuries to
along the body from the contralateral arm on the non-kick-             the superior glenohumeral labrum anterior and posterior regions
ing side to the kicking leg as it extends and abducts, resulting       in throwing shoulders [57]. In individuals with chronic ankle in-
in trunk rotation [48]. The forward movement of the kicking            stability, changes in ankle-joint kinetics, including a decrease in
limb and the contralateral arm releases this tension arc, allow-       ankle-eversion moment and an increase in ankle plantar-flexion
ing it to shorten and demonstrate the stretch-shortening cycle         moment, were observed during side-cutting task performance.
[48]. For kicking to happen, the trunk generates a sequential          Additionally, increased hip joint stiffness was observed [63]. Such
  altered lower-limb kinetics and movement patterns may increase              strength of serratus anterior and moderately with that of triceps
  the risk of recurrent lateral ankle sprains [63]. Soccer players            brachii [73].
  were eight times more prone to hamstring strain injury if their
  hamstring muscles were activated after the lumbar erector spinae            The Bunkie test
  (normally, the hamstring is to be activated before the erector spi-
  nae) during prone hip extension (mid-range and end-range) [64].                The Bunkie test examines kinetic chains across the fascia and
     The kinetic chain concept implies that the disorder of a joint           detects the apparent restrictions in the kinetic chains along the fas-
  can precipitate injuries to other joints (usually distal to the joint       cia lines [31]. Mayer's anatomy trains serve as the foundation for
  involved) [65]. Athletes who are landing with altered lower-limb            the kinetic chains employed in this test [29]. Each kinetic chain is
  mechanics (with dynamic knee valgus, tibia internal rotation, and           associated with a particular testing position, with both the right
  pronated feet) have a high risk of sustaining acute ACL non-con-            and left sides of the body being evaluated. Participants are re-
  tact injury [66] and anterior knee pain as overuse injury [65, 67,          quired to maintain the testing position for 40 seconds. There is
  68]. In alpine skiers, tibia internal rotation with a knee full exten-      a significant correlation between performance constructs (agility,
  sion or flexion beyond 90° was linked to a non-contact ACL in-              speed, explosive power, and muscle endurance) and performance
  jury [66]. More proximally, impaired trunk control, motion, and             in the Bunkie test in healthy rugby players [31].
  body-weight shift on the lower limb were linked to a high risk of
  ACL non-contact injuries [66].                                              Closed kinetic chain dynamic lower extremity stability
                                                                              (CKCLE) (developed by Lee, Hwang, Jung, Ahn, and Kwon,
                                                                              2020)
  Kinetic chain-related clinical tests
  The closed kinetic chain upper extremity stability test                        The closed kinetic chain dynamic lower extremity stability (CK-
  (CKCUES test)/ Davis test                                                   CLE) test is a novel test examining the functional performance
                                                                              and assessing antigravity posterolateral hip musculature function.
     The closed kinetic chain upper extremity stability test (CKCUES          During this test, individuals are instructed to lift one foot, touch
  test) is a valuable, cost-effective clinical tool for evaluating shoulder   it to the opposite knee, and then lower it back to the floor while
  performance [69]. It provides quantitative data for assessing upper         isometrically maintaining the bridging position. This motion is re-
  extremity function in a closed kinetic chain context [54]. This test        peated for 20 seconds, and the score is based on the number of
  targets explicitly the stability of the scapular muscles, making it         touches achieved in that time frame. There is a positive and signifi-
  useful for evaluating scapular stability [70]. Furthermore, it deter-       cant correlation between the strength of the supporting lower-limb
  mines the upper limb function, progression in rehabilitation, and           hip extensors, abductors, and external rotators and the number of
  return-to-sport judgment [71]. The CKCUES test shows strong                 foot touches completed in 20 seconds [74].
  reliability and validity [71] and is designed to be user-friendly for
  clinicians, making it easy to administer and comprehend [72]. The           Closed kinetic chain lower extremity stability test
  test score is determined by counting the number of times the indi-          (CKCLEST) (developed by Arikan, Maras, Akaras, Citaker,
  vidual, while in a plank position, is touched by their swinging hand        and Kafa, 2021)
  and supporting hand [72]. Its performance strongly correlates with
  the isokinetic strength of shoulder flexors and elbow extensors at           The closed kinetic chain lower extremity stability test (CK-
  180°/s for men [71]. It is strongly associated with the isometric           CLEST) is a novel, easy, and cost-effective performance-based
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        bjsm.2009.062810                                                                                  /15438627.2021.1906674