본문바로가기

Effects of an 8-week Pilates Core Training on the Stability and Symmetry of the L-sit on Rings

Abstract

Objective: Gymnastics on rings needs a high level of muscle strength with balance ability for controlling the body. A study on a new balance training program is necessary for elite gymnasts. Therefore, the purpose of this study was to investigate the effects of an 8-week pilates core-muscle training on balance ability and asymmetry index of the L-sit on the rings in male elite gymnasts.

Method: Ten elite gymnasts (age: 20.6±0.7 years, height: 169.9±4.9 cm, weight: 65.4±5.6 kg, career duration: 20.6±0.7 years), who are students at K-university, participated in this study.

Results: First, the range of the COM tended to decrease in the anterior-posterior direction. Second, the left hip joint angle and knee extension and ankle dorsiflexion angles significantly increased after the pilates training. Third, the ROM also increased. Fourth, the symmetry value increased in the hip angle, while the symmetry index in all joints of the ROM decreased. As a result, the pilates core-muscle training influenced the static balance ability during the L-sit on the rings.

Conclusion: Accordingly, the pilates core-muscle training is suitable in enhancing the basic balance ability in gymnastics on rings.



Keywords



Gymnastics Rings L-sit Perturbation Symmetry



INTRODUCTION

The ring is a gymnastic event where participants compete with their expressive abilities and techniques 260 cm above the mat, suspended by two rings hung on ropes (Kim & Nam, 2015). The technical criteria encompass shaking, strength techniques, and holding (Federation of International Gymnastics [FIG], 2013). Since the techniques are perfor- med while holding on to rings, they require more strength than other events (Back, Park, & Lee, 2006; Bernasconi, Tordi, Paratte, & Rouillon, 2004; Dunlavy et al., 2007).

The rings can be divided into five groups based on the acting elements. Group I encompasses rising and swing motions (including L-sit); group II encompasses handstand motions (2 sec); group III encompasses rising and holding (L-sit not included; hold for 2 sec); group IV encompasses holding with muscle strength (2 sec); and group V encompasses de- scending motions. Ring events must display one technique from the five element groups described above (FIG, 2013) and require a stable static balance since most transitions between dynamic techniques require holding with muscle strength (Han & Jeong, 2012; Omorczyk, Kost, Dudek, Bujas, & Nosiadek, 2013). L-sit is the most basic movement that evaluates static balance (Sommer, 2008) and is a strength technique that connects to other successive techniques (Straddled L-sit, Uprise fwd to L-sit, Any-cross, Backward swing to L-sit, Kip to L-sit, Uprise bwd, to straddled L-sit, From cross, press to L-sit) (FIG, 2013).

A study by Uzunov (2012) described L-sit as an essential technique that should be mastered before advancing to more difficult movements, such as handstand and pike. A study by Sommer (2008) stated that in order to overcome the instability of the ropes during L-sits, co-operation between flat back, chest up, locked elbow, hip forward, and leg hold should be improved.

The scoring criteria of the FIG (2013) state that L-sit is a low-difficulty (A, B, C) technique compared to the highest-leveled technique at F (0.6). However, high-level techniques, such as L-cross and V-sit (D, E) require L-sit as initiation; therefore, L-sit is directly related to balance evaluation. Further, it has been reported that L-sit requires the most practice time since it is a basic technique that determines the level of perfection of a routine (Sommer, 2008). Therefore, technical analysis of L-sit should be conducted for successful completion of a routine.

Previous studies on the rings to date have conducted electromyo- graphy (EMG). A study by Yoon (1997) reported that effective training methods could be developed by analyzing EMG data, while that by Kim (1985) reported that the muscle activities of the upper limbs were higher while performing an iron cross. Further, another study by Kim (2001), which analyzed EMG data while the participants performed an inverted iron cross, reported that the highest upper limb muscle activities were observed in the biceps followed by the triceps. A study by Park (2004) reported that during swallow, back muscle activities were the highest in the erector spinae followed by the pectoralis major, palmaris longus, triceps, deltoid, latissimus dorsi, and trapezius. Considering the different muscle distributions, the activity of the pectoralis major should be in- creased in order to improve stability.

Previous studies were mostly fragmental studies where only muscle activities in different positions, order of muscle activation, and location of the muscle activities were identified. Therefore, development of a training program that could influence the actual performance has been limited.

A recent study by Jason (2011) reported that the constant holding of the swaying body on rings could be a solution since the capacity of the complex core muscles is increased.

Although several core training methods have been used by elite gymnasts (Basset & Leach, 2011; Hibbs, Thompson, French, Wrigley, & Spears, 2008; Kim & Lee, 2010; McGil, 2010; Verschueren, Roelants, Delecluse, Swinnen, Vanderschueren, & Boonen, 2004; Wang & Li, 2007), most of them were intended for rehabilitation of the athletes after accidents and not intended solely to improve performance (Hibbs et al., 2008; Kim & Lee, 2010; McGil, 2010). Studies that investigated the stiffness of the muscle during core training (Wang & Li, 2007) and appli- cations of a new training to improve the performance of elite gym- nasts are almost non-existent. Recently, pilates has gained attention as an equipment-using core training method (Critchley, Pierson, & Battersby, 2011; Culligan et al., 2010; Emery, De Serres, McMillan, & Cote, 2010; Irez, Ozdemir, Evin, Irez, & Korkusuz, 2011; Kloubec, 2010; Park & Kim, 2007). Pilates is a regulatory exercise (contrology) developed for a neutral spine. Pilates develops the core muscles, such as the spinal erector muscle, transversus abdominis, and internal oblique to stabilize the spine and regulates the pelvis and hip (Phrompaet, Paungmali, Pirunsan, & Sitilertpisan, 2011).

Since pilates is based on static movements, such as balancing, focusing, regulation of movements, precision, respiration, and flow (Herrington & Davies, 2005; Johnson, Larsen, Ozawa, Wilson, & Kennedy, 2007; McMillan, Proteau, & Lebe, 1998; Sekendiz, Altun, Korkusuz, & Akin, 2007), it can be inferred that pilates would be an effective training method for the rings, which require strength holding and static balance.

Therefore, in this study, an 8-week pilates core training was applied, and the kinetic changes while performing the L-sit were analyzed. The analysis will be then used to evaluate the effectiveness of pilates as a balance-improving training program for elite gymnasts.

METHODS

1. Subjects

This study was conducted on 10 gymnasts from K University. The con- trol group was composed of five gymnasts receiving existing trainings, and the training group was composed of five gymnasts who have received the 8-week pilates training. The participants' characteristics are shown in (Table 1).

Group (n)

Age
(years)

Height
(cm)

Weight
(kg)

Career duration (years)

Control
group (5)

21.8±0.8

167.4±4.6

63.4±4.4

11.6±1.5

Training
group (5)

21.4±0.5

172.4±4.0

67.4±6.5

11.8±1.8

Table 1. Research participants

2. Training program

The pilates training program used in this study was developed by both a current pilates instructor and a gymnastics instructor from K University to take into account the gymnasts' abilities. The trainings were conducted regularly two times a week for one hour per session while both instructors were present. The components of the pilates training program are shown in (Table 2) & (Figure 1).

Exercise

Times

Abdominal curls

- Feet on the floor

- Legs in the chair position

- Legs straight, ring between the legs

 8

Oblique abdominals

- Criss cross

- Oblique reach

(abdominals with the ring between the legs)

 8

Hip lift

- Head down

- Head up

 6

Roll up

 6

Roll over

 6

The hundred

- Knees bent

- Lift the upper body & lower the legs

 5

Bridge

- Marching, bridge position lift one leg off the mat

- Ridge position, one leg on the ring

 6

Rolling like a ball

10

Open leg rocker

 6

Teaser series

- Teaser #1

- Teaser #2

- Teaser #3

 4

Side leg series (both sides)

- Leg lifts, advanced position

- Leg circles, advanced position

- Bananas, lift bottom arm & ring squeeze

 8

Jackknife

 6

Opposite arm and leg reach 3

 4

Leg pull down

 6

Leg pull up

 6

Kneeling side kicks (each side)

 6

Kneeling side circles (each side)

 6

Side bend twist (each side)

 4

Side bend mermaid (each side)

 4

Table 2. Pilates core training program
Figure 1. Pilates core training.

3. Procedure

This study was conducted by performing L-sits on the ring before and after pilates core training, and the balance was evaluated while the participants performed 2 sec of the L-sit movement. The completion level of the L-sit was confirmed by the gymnastics referee from K University (Licensed referee). In order to record the movement, reflect markers were placed on the joints (four on the upper limb and four on the lower limb) and on the ring (two on each ring). Eight infrared cameras (Oqus 500, Qualisys, SWE) were used to record and collect data. The sampling rate of the cameras was set to 100 Hz, and the extracted 3D coordinates were processed with the Buterworth 2nd order low-pass filter to reduce the noise. The cut-off frequency was set to 6 Hz.

4. Data analysis

The balance ability while maintaining the L-sit hold was analyzed using the Qualisys Track manager software (Qualisys, SWE) and Matlab R2009b software (The Mathworks, USA). For body modeling, 16 markers were placed on the joints, and kinetic data were calculated. The com- pletion level of the L-sit hold was determined using the FIG (2013) for the scoring criteria, which state that the lower limbs should be horizontal while the gymnast is on the rings and have to hold the position for 2 sec. If there is a deviation in the angle (<15°, 16~30°, >45°), the hand, foot, or body is adjusted, or if the ring rope is shaken vigorously, the hold was deemed as invalid by the FIG article 22. The hold was in- spected by a referee and was approved if it did not violate any of the criteria listed above (Figure 2). For adjustments to the testing environment, three trials were conducted, and the most stable trial was con-firmed by the referee and the data from the most stable trial were analyzed.

Figure 2. Rule of the L-sit.

5. Analysis variables

To investigate the effects of the pilates core training on the L-sit hold in elite gymnasts, the average kinetic variables and their standard de- viations and the symmetry index (SI) of L-sit, as shown in (Figure 3), were analyzed.

Figure 3. L-sit posture.

1) Displacement

The magnitude of shaking and the changes in trajectory of the center of mass (COM) movement (FIG, 2003), which are factors for deduction, were confirmed by analyzing each variableˈs anterior-posterior, medio¬lateral, and superior-inferior changes.

- COM  

- Finger position

- Toe position

2) Angle & range of motion (ROM)

In order to analyze the changes in the gymnast's position while re- stricting shaking and movement, the angle and ROM of the lower limb joints were defined (Figure 4) and analyzed.

- Hip joint angle 

- Knee joint angle 

- Ankle joint angle

Figure 4. Define angles.

3) SI

A previous study that used the symmetry analyzing method (Kim & Eng, 2003; Robinson, Herzog, & Nigg, 1987) calculated the bilateral lower limb joint angle and ROM SI. An SI close to 0% indicates sym- metry and could range up to 200% (Yoo et al., 2014).

 = Right foot variable,  = Left foot variable

6. Statistical analysis

In order to investigate the changes between the groups and before and after pilates training, a two-way repeated measure analysis of vari- ance was conducted. The significance level was set to α=.05.

RESULTS

To investigate the effects of the 8-week pilates core training on bal- ance during the L-sit hold, the ROM of the COM during the movement, ROM of the distal hands and feet, angles and ROM of the lower limb joints, and SI were measured. The measurements are shown below.

1. ROM of the body

Although no significant changes in the COM were observed in the anterior-posterior, medio-lateral, and superior-inferior directions, the con- trol group showed an increase in the medio-lateral direction from 5.03±3.46 cm to 6.16±3.38 cm, while the experimental group showed a decrease in the medio-lateral direction from 4.96±3.32 cm to 3.38±0.91 cm (Table 3). The ROMs of the right distal hand and foot in the superior-inferior direction increased from 4.39±1.08 cm to 7.17±2.77 cm after the training. The ROMs of the right and left distal feet in the medio-lateral direction showed interaction effects of p=.03 for each, which indicates the effects of the training.

Variables

Group

Pre-test

Post-test

F (p)

COM range

M-L

CG

5.03±3.46

6.16±3.38

0.04 (0.85)

TG

4.96±3.32

3.38±0.91

F (p)

0.91 (0.37)

1.44 (0.26)

COM range

A-P

CG

7.58±3.07

3.37±2.91

3.35 (0.10)

TG

11.38±7.42

10.02±4.95

F (p)

3.68 (0.09)

0.87 (0.38)

COM range

S-I

CG

0.88±0.52

1.05±0.62

4.14 (0.08)

TG

0.89±0.10

1.05±0.33

F (p)

0.00 (0.99)

0.01 (0.91)

R Finger

M-L

CG

5.27±3.60

6.49±3.64

0.23 (0.65)

TG

5.96±3.84

5.94±1.88

F (p)

0.00 (0.97)

0.24 (0.64)

R Finger

A-P

CG

10.61±3.24

7.09±2.26

1.67 (0.23)

TG

13.32±7.93

113.45±6.09

F (p)

1.78 (0.22)

0.07 (0.80)

R Finger

S-I

CG

3.86±0.66

5.96±2.63

10.38 (0.01)

TG

4.39±1.08

7.17±2.77*

F (p)

0.73 (0.42)

0.20 (0.67)

L Finger

M-L

CG

7.14±3.99

8.78±3.95

0.40 (0.54)

TG

7.51±4.10

3.90±1.71

F (p)

1.86 (0.21)

2.85 (0.13)

L Finger

A-P

CG

10.05±2.53

5.22±3.25

2.51 (0.15)

TG

14.42±7.96

14.05±5.90

F (p)

4.93 (0.06)

1.83 (0.21)

L Finger

S-I

CG

5.44±4.68

3.46±2.51

0.16 (0.70)

TG

4.07±2.11

6.82±4.78

F (p)

0.21 (0.66)

6.05 (0.04)

R toe

M-L

CG

5.96±3.81

9.15±4.12

0.04 (0.84)

TG

7.80±4.07

5.07±3.57

F (p)

0.26 (0.62)

7.02 (0.03)

R toe

A-P

CG

8.62±3.61

4.26±3.17

2.77 (0.13)

TG

11.20±8.06

9.55±5.10

F (p)

1.90 (0.21)

0.56 (0.47)

R toe

S-I

CG

5.47±06.58

8.36±4.72

3.39 (0.10)

TG

5.50±1.93

6.88±08.86

F (p)

0.38 (0.56)

0.43 (0.53)

L toe

M-L

CG

6.05±3.73

9.12±4.11

0.04 (0.85)

TG

7.90±4.10

5.28±3.39

F (p)

0.21 (0.66)

6.53 (0.03)

L toe

A-P

CG

8.50±3.61

4.27±3.21

3.00 (0.12)

TG

11.61±8.04

10.03±5.51

F (p)

2.19 (0.18)

0.62 (0.45)

L toe

S-I

CG

5.53±0.89

8.16±4.77

3.33 (0.11)

TG

5.46±1.72

7.12±0.89

F (p)

0.23 (0.65)

0.17 (0.69)

Table 3. Oscillation of the motions COM: center of mass, R: right, L: left, M: medio, L: lateral, A: anterior, P: posterior, S: superior, I: inferior *: significant difference between pre-training and post-training at p<.05

2. Lower limb joint angles

The left hip joint while performing the L-sit hold increased from 62.89±4.46° to 67.50±8.97° in the control group after the training, while the hip angle significantly increased from 59.16±5.62° to 68.11±4.56° (p=.01). The changes in the right knee angle were significantly different between the two groups, and the left knee angle showed almost no change from 174.97±2.31° to 174.66±2.93° in the control group. The left knee angle in the experimental group increased from 171.98±2.76° to 178.49±1.42° (p=.01). The results indicate an interaction effect (p=.01), and the effects of the training were confirmed (Table 4). The ankle angles decreased from 141.61±10.95° to 136.86±6.45° in the control group and decreased from 136.06±6.12° to 129.64±6.55° in the experi- mental group (p=.01).

Variables

Group

Pre-test

Post-test

F (p)

R Hip

CG

73.63±4.76

73.15±6.18

2.98 (0.12)

TG

72.93±8.15

67.66±6.31

F (p)

0.69 (0.43)

2.08 (0.19)

L hip

CG

62.89±4.46

67.50±8.97

12.60 (0.01)

TG

59.16±5.62

68.11±4.56*

F (p)

0.21 (0.66)

1.29 (0.29)

R knee

CG

176.44±1.14

177.67±1.39

1.81 (0.22)

TG

173.95±2.2

175.05±3.2

F (p)

6.00 (0.04)

0.01 (0.94)

L knee

CG

174.97±2.31

174.66±2.93

11.09 (0.01)

TG

171.98±2.76

178.49±1.42*

F (p)

0.12 (0.74)

13.39 (0.01)

R ankle

CG

141.61±10.95

136.86±6.45

10.23 (0.01)

TG

136.06±6.12

129.64±6.55*

F (p)

1.93 (0.20)

0.23 (0.65)

L ankle

CG

140.35±12.59

134.75±10.67

3.63 (0.09)

TG

133.36±6.97

131.71±8.32

F (p)

0.71 (0.42)

1.07 (0.33)

Table 4. Joint angles R: right, L: left *: significant difference between pre-training and post-training at p<.05

3. ROM of the lower limb joints

The ROM of the hip, knee, and ankle joints showed an overall increase after the L-sit (Table 5). The ROM of the right knee did not change significantly from 0.74±0.28° to 0.88±0.26° in the control group, while that in the experimental group showed a significant increase from 0.84 ±0.56° before training to 1.98±0.91° after training (p=.01). Further, it was determined that interaction effects were present after the training (p=.02).

Variables

Group

Pre-test

Post-test

F (p)

R Hip

CG

2.81±1.34

3.01±1.94

0.53 (0.49)

TG

2.35±0.92

3.04±1.09

F (p)

0.12 (0.74)

0.16 (0.70)

L hip

CG

2.54±1.14

2.83±1.24

3.02 (0.12)

TG

2.6±0.98

4.02±1.62

F (p)

0.97 (0.35)

1.32 (0.28)

R knee

CG

0.74±0.28

0.88±0.26

12.73 (0.01)

TG

0.84±0.56

1.98±0.91*

F (p)

3.79 (0.09)

7.81 (0.02)

L knee

CG

1.22±0.56

1.90±2.19

1.07 (0.33)

TG

0.76±0.20

1.35±1.31

F (p)

0.81 (0.39)

0.01 (0.94)

Variables

Group

Pre-test

Post-test

F (p)

R ankle

CG

1.11±0.56

1.77±0.63

4.92 (0.06)

TG

1.60±0.95

2.18±0.74

F (p)

1.45 (0.26)

0.02 (0.89)

L ankle

CG

2.05±1.92

2.74±2.45

0.01 (0.92)

TG

2.23±1.28

1.71±0.56

F (p)

0.45 (0.52)

0.48 (0.51)

Table 5. Range of motion R: right, L: left *: significant difference between pre-training and post-training at p<.05

4. SI

The SI of the ROMs and angles of the bilateral lower limb joints during the L-sit showed that the SI of the hip joint angle decreased from 15.75±5.42% to 11.42±7.9% in the control group (Table 6). The SI in the experimental group decreased significantly from 20.69± 8.68% to 4.24±2.68% (p=.00). It was determined that interaction effects were present after the training (p=.04).

Variables

Group

Pre-test

Post-test

F (p)

Hip

CG

15.75±5.42

11.42±7.9

17.71 (0.00)

TG

20.69±8.68

4.24±2.68*

F (p)

0.11 (0.75)

6.02 (0.04)

Knee

CG

1.4±0.6

1.84±1.05

0.43 (0.53)

TG

1.94±1.21

2.15±1.37

F (p)

0.77 (0.40)

0.05 (0.82)

Ankle

CG

2.58±1.23

2.6±3.38

0.02 (0.89)

TG

5.53±1.97

5.81±3.23

F (p)

5.75 (0.04)

0.02 (0.90)

Table 6. Symmetry index of the joint angles *: significant difference between pre-training and post-training at p<.05

On the other hand, no significant differences were observed between any of the variables of the knee and the ankle. The SI of the ROMs of the lower limb joints also showed no significant differences bilaterally. Therefore, it can be inferred that the training did not have a significant effect on the SI (Table 7).

Variables

Group

Pre-test

Post-test

F (p)

Hip

CG

26.04±15.56

20.64±8.34

1.38 (0.27)

TG

54.43±27.03

37.64±41.01

F (p)

2.81 (0.13)

0.37 (0.56)

Knee

CG

47.75±28.04

58.45±51.4

0.53 (0.49)

TG

58.61±29.21

69.23±37.1

F (p)

0.33 (0.58)

0.00 (1.00)

Ankle

CG

49.29±39.67

63.3±49.42

0.05 (0.83)

TG

45.89±20.21

38.85±26.77

F (p)

0.71 (0.42)

0.46 (0.52)

Table 7. Symmetry index of the ROM ROM: range of motion *: significant difference between pre-training and post-training at p<.05
DISCUSSION

This study was conducted to investigate the effects of pilates training on the static balance during the L-sit, a movement of the gymnastics rings. The displacements, changes in the position of the distal hands and feet, angles and ROMs of the lower limb joints, and SIs were studied as variables of balance evaluation on the rings.

First, the changes in the COM of the body showed that no significant changes were observed in any of the directions. However, the medio-lateral movement increased in the control group (before training: 5.03±3.46 cm, after training: 6.16±3.38 cm) while it decreased in the experi- mental group (before training: 4.96±3.32 cm, after training: 3.38±0.91 cm). Therefore, it can be inferred that the training indirectly affects the medio-lateral movement. Significantly increased distal hand movements in the superior-inferior direction in the experimental group and inter- action effects between the distal feet and the medio-lateral direction (p=.03) indicate that the pilates training effectively decreases the medio-lateral movement of the COM of the body.

Second, the angle of the left hip joint significantly increased from 59.16±5.62° to 68.11±4.56° after the training in the experimental group (p=.01). However, the change was not consistent with that in the right hip joint, where the average angle decreased; therefore, it can be in- ferred that each hip joint moves in different directions. These findings coincide with the findings in the study by Uzunov (2012), which re- ported that the hip should face forward and the lower limbs should be straight during the L-sit. The different hip joint movements during the core training can be inferred to be due to motor control (Akuthota & Nadler, 2004), and the hip could have moved to stabilize the COM of the body (McGill, 2010). Further, the reason why the knee angle in- creased was to effectively transfer force to the COM (Uzunov, 2012). The increase in angle was induced by the weight bearing of the lower limb (Willardson, 2007), and the decrease in ankle angles in both groups indicates that those techniques were performed to maintain the straight extension of the lower limb during the L-sit.

The ROM of the right knee significantly increased from 0.84±0.56° before training to 1.98±0.91° after training in the experimental group (p=.01). The ROM of the other joints has overall increased. As stated previously, the changes were caused by the regulatory efforts of the lower limbs. The SI confirmed that the hip joint symmetry improved after the training (before training: 12.22±6.31%, after training: 2.32± 1.38%), which indicates that the training evidently affects the ROM of the joints of the group that received the training (p=.05).

Since the ultimate goal of the L-sit is to stabilize posture, it can be inferred that the unstable lower limbs are alternatively regulated by the hip joints. Owing to the characteristic free movement of the rings (all directions freely; Yamada, Watanabe, Kiguchi, & Izumi, 2001), deliberate changes in the lower limb (knees and ankles) during unstable conditions (Plessner & Schallies, 2005) contribute to the stability handling by the hip joint.

Ultimately, it can be inferred that equilibrium and agility, which are crucial for body balance (Chae, Jang, & Woo, 1992; Kim et al., 2007), have been improved by the pilates training.

CONCLUSION

This study was conducted to investigate the effects of an 8-week pilates core training on balance during the L-sit hold. Five participants were selected for the control group and five for the experimental group that received the pilates core training. The ROM of the body, lower limb joint angles, ROM of the lower limb joints, and SI before and after the training were analyzed and compared. The results were as follows:

First, the ROM of the body decreased in the medio-lateral direction. Second, the left hip joint angle increased after the training, while the knee angle increased after the core training and the ankle joint was dorsiflexed. Third, the ROMs of the joints increased after the core training. Fourth, the SI of the hip joint angle and ROMs of all the joints also in- creased. Therefore, it was determined that pilates core training posi- tively affects the static balance during L-sits and is suitable as a training program that improves the basic balance for the rings.



References


1. Akuthota, V. & Nadler, S. F. (2004). Core strengthening. Archives of Physical Medicine and Rehabilitation, 85, 86-92.
Crossref  Google Scholar  PubMed 

2. Back, J. H., Park, J. H. & Lee, Y. S. (2006). Longitudinal Kinematical Analysis of Kip to Swallow Motion in Rings. Korean Society of Sports Biomechanics, 16(3), 173-181.
Crossref  Google Scholar 

3. Basset, S. H. & Leach, L. L. (2011). The effect of an eight-week training programme on core stability in junior female elite gymnasts. Afr. J. Phys. Hlth. Edu, 9-19.
Crossref  Google Scholar 

4. Bernasconi, S., Tordi, N., Parratte, B., Rouillon, J. D. & Monnier, G. (2004). Surface electromyography of nine shoulder muscles in two iron cross conditions in gymnastics. Journal of Sports Medicine and Physical Fitness, 44(3), 240-245.
Crossref  Google Scholar 

5. Chae, H. W., Jang, Y. S. & Woo, B. W. (1992). Sport Physiology for Coaches. Bogyung: Seoul.
Crossref 

6. Critchley, D. J., Pierson, Z. & Battersby, G. (2011). Effect of pilates mat exercises and conventional exercise programmes on transversus abdominis and obliquus internus abdominis activity: pilot rando- mised trial. Manual Therapy, 16(2), 183-189.
Crossref  Google Scholar 

7. Culligan, P. J., Scherer, J., Dyer, K., Priestley, J. L., Guingon-White, G., Delvecchio, D. & Vangeli, M. (2010). A randomized clinical trial comparing pelvic floor muscle training to a Pilates exercise program for improving pelvic muscle strength. International Urogynecology Journal, 21(4), 401-408.
Crossref  Google Scholar 

8. Dunlavy, J. K., Sands, W. A., McNeal, J. R., Stone, M. H., Smith, S. L., Jemni, M. & Haff, G. G. (2007). Strength performance assessment in a simulated men's gymnastics still rings cross. Journal of Sports Science & Medicine, 6(1), 93-97.
Crossref  Google Scholar 

9. Emery, K., De Serres, S. J., McMillan, A. & Côté, J. N. (2010). The effects of a Pilates training program on arm-trunk posture and movement. Clinical Biomechanics, 25(2), 124-130.
Crossref  Google Scholar  PubMed 

10. Federation of International Gymnastics (2013). International Code of Point-man Artistic Gymnasts.
Crossref 

11. Han, S. H. & Jeong, I. S. (2012). Kinematic Analysis on Forward Roll in Leaning Position after Performing Floor Exercise Handstand. The Korea Journal of Sports Science, 21(3), 1409-1420.
Crossref 

12. Herrington, L. & Davies, R. (2005). The influence of Pilates training on the ability to contract the transversus abdominis muscle in asymp- tomatic individuals. Journal of Bodywork and Movement Therapies, 9(1), 52-57.
Crossref  Google Scholar 

13. Hibbs, A. E., Thompson, K. G., French, D., Wrigley, A. & Spears, I. (2008). Optimizing performance by improving core stability and core strength. Sports Medicine, 38(12), 995-1008.
Crossref  Google Scholar  PubMed 

14. Irez, G. B., Ozdemir, R. A., Evin, R., Irez, S. G. & Korkusuz, F. (2011). In- tegrating Pilates exercise into an exercise program for 65+ year-old women to reduce falls. Journal of Sports Science & Medicine, 10(1), 105-111.
Crossref  Google Scholar  PubMed 

15. Jason Shea M. S., & PICP, P. (2011). Rethinking Core Training. APECSl: USA.
Crossref 

16. Johnson, E. G., Larsen, A., Ozawa, H., Wilson, C. A. & Kennedy, K. L. (2007). The effects of Pilates-based exercise on dynamic balance in healthy adults. Journal of Bodywork and Movement Therapies, 11(3), 238-242.
Crossref  Google Scholar 

17. Kim, C. M. & Eng, J. J. (2003). Symmetry in vertical ground reaction force is accompanied by symmetry in temporal but not distance variables of gait in persons with stroke. Gait and Posture, 18(1), 23 -28.
Crossref  Google Scholar 

18. Kim, D. M. & Nam, S. K. (2015). Trend Analysis of Exercise Content on the Rings Final in the Artistic Gymnastics World Championships 2015. The Korean Journal of Sport, 14(2), 51-60.
Crossref  Google Scholar 

19. Kim, K. H., Kim, K. B., Choi, M. D., Heo, J. Lee, D. S., Park, J. H. Joe, K. L., Kim, H. G. & Jung, D. S., (2007). Measurement and Evaluation of Physical Education. Hyungsung: Seoul.
Crossref 

20. Kim, K. H. & Lee, S. C. (2010). Dynamic Stability Effect of Applicable Core and Neuromuscular Training for 12 Weeks. Korean Journal of Sport Biomechanics, 20(1), 101-108.
Crossref  Google Scholar 

21. Kim, M. C. (2001). EMG Analysis of Handstand Motion in Rings. Un- published master thesis, Busan University.
Crossref 

22. Kim, W. S. (1985). EMG Analysis of the Ring Movement. Unpublished master thesis, Yeungnam University.
Crossref 

23. Kloubec, J. A. (2010). Pilates for improvement of muscle endurance, flexibility, balance, and posture. The Journal of Strength & Con- ditioning Research, 24(3), 661-667.
Crossref  Google Scholar  PubMed 

24. McGill, S. (2010). Core training: Evidence translating to better perfor- mance and injury prevention. Strength & Conditioning Journal, 32(3), 33-46.
Crossref  Google Scholar 

25. McMillan, A., Proteau, L. & Lèbe, R. M. (1998). The effect of Pilates-based training on dancers' dynamic posture. Journal of Dance Medicine & Science, 2(3), 101-107.
Crossref  Google Scholar 

26. Omorczyk, J., Kost, M., Dudek, D., Bujas, P. & Nosiadek, L. (2013). The level of technical efficiency of youngest-category gymnasts based on the phase structure of elementary floor exercises. ANTROPOM OTORYKA.
Crossref  Google Scholar 

27. Park, I. B. & Kim, J. T. (2007). The Effects of Elastic Resistance and Pilates Exercise on EMG in Baseball Pitcher. Korean Journal of Sport Biomechanics, 17(4), 127-139.
Crossref  Google Scholar 

28. Park, K. D. (2004). EMG Analysis of Swallow Motion in Rings. Korean Journal of Sport Biomechanics, 14(1), 41-50.
Crossref  Google Scholar 

29. Phrompaet, S., Paungmali, A., Pirunsan, U. & Sitilertpisan, P. (2011). Effects of pilates training on lumbo-hip stability and flexibility. Asian Journal of Sports Medicine, 2(1), 16.
Crossref  Google Scholar  PubMed 

30. Plessner, H. & Schallies, E. (2005). Judging the cross on rings: A matter of achieving shape constancy. Applied Cognitive Psychology, 19(9), 1145-1156.
Crossref  Google Scholar 

31. Robinson, R. O., Herzog, W. & Nigg, B. M. (1987). Use of force platform variables to quantify the effects of chiropractic manipulation on gait symmetry. Journal of Manipulative and Physiological Therapeutics, 10(4), 172-176.
Crossref  Google Scholar 

32. Sekendiz, B., Altun, Ö., Korkusuz, F. & Akın, S. (2007). Effects of Pilates exercise on trunk strength, endurance and flexibility in sedentary adult females. Journal of Bodywork and Movement Therapies, 11(4), 318-326.
Crossref  Google Scholar 

33. Sommer, C. (2008). Building the Gymnastic Body: The Science of Gymnastcis strength training. Olympic Bodies: Canada.
Crossref 

34. Uzunov, V. (2012). Developing the Straddle Sit Press to Handstand. Gym Coach Journal, 5, 1-5.
Crossref  Google Scholar 

35. Verschueren, S. M., Roelants, M., Delecluse, C., Swinnen, S., Vanderschueren, D. & Boonen, S. (2004). Effect of 6-Month Whole Body Vibration Training on Hip Density, Muscle Strength, and Pos- tural Control in Postmenopausal Women: A Randomized Con- trolled Pilot Study. Journal of Bone and Mineral Research, 19(3), 352-359.
Crossref  Google Scholar 

36. WANG, W. X. & LI, H. X. (2007). Competitive Athletes' Core Strength Training. Journal of Beijing Sport University, 8, 044.
Crossref  Google Scholar 

37. Willardson, J. M. (2007). Core stability training: applications to sports conditioning programs. The Journal of Strength & Conditioning Research, 21(3), 979-985.
Crossref  Google Scholar 

38. Yamada, T., Watanabe, K., Kiguchi, K. & Izumi, K. (2001). Acquisition of fuzzy control based exercises of a rings gymnastic robot. In Ro- botics and Automation, 2001. Proceedings 2001 ICRA. IEEE Inter- national Conference on (Vol. 3, pp. 2584-2589). IEEE.
Crossref  Google Scholar 

39. Yoon, S. H., Gil, H. J., Kim, J. N., Ha, S. H., Ryu, J. S., Park, S. K. & Yoon, S. H. (2014). The Effects of Sports Talented Exercise Program on Single Leg Standing Balane. The Korean Journal of Physical Education, 53(3), 721-730.
Crossref 

40. Yoon, Y. J. (1997). EMG Analysis of Flex Motion with Handstand. Un- published master thesis, Seoul University.
Crossref 

PIDS App ServiceClick here!

Download this article
Jump to: