The Effects of a Pre-Throwing Program on Collegiate NCAA Division I Softball Pitchers’ Biomechanical Measures of the Hip and Shoulder Range of Motion
Gretchen D.
Oliver1*, Jessica K. Washington1, Kenzie B. Friesen1,
Adam W. Anz2, Jeff R. Dugas3, James R.Andrews2
1Sports Medicine
& Movement Lab, School of Kinesiology, Auburn University, Auburn, AL, USA
2Andrews
Institute for Orthopaedics & Sports Medicine, Gulf Breeze, FL, USA
3Andrews Sports Medicine and Orthopaedic Center, Birmingham, Alabama, USA
*Corresponding author: Gretchen D. Oliver, School of Kinesiology, Auburn University, 301 Wire Road, Auburn, Alabama 36849, USA. Tel: +1-3348444483; Fax: +1-3348441467; Email: goliver@auburn.edu
Received Date: 14February, 2018; Accepted Date: 27February,
2018; Published Date: 06March, 2018
Citation: Oliver GD, Washington JK, Friesen KB, Anz AW, Dugas JR, et al.(2018) The Effects of a Pre-Throwing Program on Collegiate NCAA Division I Softball Pitchers’ Biomechanical Measures of Hip and Shoulder Range of Motion. J Orthop Res Ther 2018: 181. DOI: 10.29011/2575-8241.000181
1. Abstract
The purpose of the study was to examine the effects of a pre-throwing program on softball pitchers’ passive rotational hip and shoulder range of motion and isometric strength.Four female fast-pitch softball pitchers (20.6 + 1.4 yrs, 174.0 + 6.7 cm, 82.6 + 6.6 kg) completed a pre-throwing program one hour prior to the start ofevery game.Data were collected pre-game, post-game, and 24-hours post game three times: pre-season, mid-season, and post-season. Data were analyzed using a repeated-measures analysis of variance with an alpha level of p<0.05.Statistical analysis revealed a significant decrease in throwing shoulder internal rotation from pre-season to mid-season (Mean Difference (MD) = -8.692, p=0.001) and from pre-season to post-season (MD= -12.617, p=0.002) in addition to a significant decrease innon-throwing shoulder internal rotation from pre-season to mid-season (MD= -9.542, p=0.012) and from pre-season to post-season (MD= -12.792, p=0.003). Additionally, a significant increase was revealed in external rotation strength of the non-throwing shoulder from pre-game to 24 hours post-game (MD = 0.925, p=0.043) as well as a significant increase in post-game external rotation strength of the back hip from pre-season to post-season (MD = 1.375, p=0.003).No significant differences were found in rotational hip range of motion, suggesting the pre-throwing program helped maintain the necessary kinematics to aid proper pitching mechanics.These data support the continual implementation of a pre-throwing program as well as biomechanical monitoring of passive range of motion in addition, the need of further research aiming to enroll additional teams into the pre-throwing program. Recruitment of additional teams both to the pre-throwing program as well as serving as a control would allow for more definitive conclusions of the program’s effectiveness.
2.
Keywords: Injury
Prevention; Performance; Windmill Softball Pitching
Figure 1: Inclinometer
placement for shoulder ROM measurement.
Figure 2: Inclinometer
placement for hip ROM measurement.
Figure 3: Dynamometer
placement for shoulder ISO measurement.
Figure 4: Dynamometer
placement for hip ISO measurement.
Table 1: Pre-throwing Program exercises.
Exercise
|
Description |
Single Leg Stance |
Non-weight bearing hip is flexed to 90 degrees with |
Lunge: without knee touching ground |
Arms remain in the W position, elbows to the opposite back pocket. |
Airplane |
Body parallel to the ground, weight bearing leg straight and fully flexed at the hip. |
Deep Squat |
Arms overhead in line with the ears. |
Single Leg Standing Hip Abduction |
Leg moving does not rest on the ground. Try to balance the whole time on standing leg and try not to lean forward or to the weight bearing side. |
Single Leg Standing Hip Extension |
Leg moving should not allow foot to rest on the ground throughout the exercise and try not to allow the trunk to lean forward. |
Side Lying Clams |
Position the body where hips, shoulder and knees are in a straight line, with knees bent and feet stacked. |
Basic Plank |
Maintain tight core and do not let butt rise into the air. |
Plank with Shoulder Taps |
Maintain tight core and do not let butt rise and do not rotate body when tapping. |
Basic Plank with Hip Abduction |
Maintain tight core and do not let butt rise into the air, try to keep abduction leg/foot off the ground the whole time. |
Pelvic Bridge |
Core tight, straight line from shoulders to hip with feet Together. |
Pelvic Bridge with Bands and Clams |
Core tight, straight line from shoulders to hip with feet together. |
Single Leg Standing Hip Diagonal Abduction |
Take the leg out and back diagonally to the end range of motion and then pump. Keep moving foot off the ground. |
Single Leg Standing Hip Extension Pumps |
Extend the leg back to the end range of motion and then pump. Keep moving foot off the ground. |
Single Leg Backward Kirsty Lunge with Single Leg Hold |
Lunge backward across body to get a stretch then bring lunge leg back up to single leg stance with hip flexed at 90 degrees and hold for a count of 3. |
Single Leg Pelvic Bridge with Leg Extended |
Keep butt level with torso as the right leg extends at the knee. |
Table 2: Range of motion comparisons between Pre, Post, 24-hours following game at the time events of pre-season, mid-season, and post-season.
Pre-Season |
Mid-Season |
Post-Season |
Average |
|
|
Mean, SD |
Mean, SD |
Mean, SD |
Mean, SD |
Back Hip IR (˚) |
||||
Pre |
29.50±11.28 |
26.35±6.11 |
26.08±7.28 |
27.31±8.22 |
Post |
31.05±7.05 |
24.20±4.87 |
30.75±7.25 |
28.67±6.39 |
24-Hrs |
29.25±12.27 |
27.40±7.09 |
28.20±9.37 |
28.28±9.58 |
Average |
29.93±10.2 |
25.98±6.02 |
28.34±7.97 |
- |
Back Hip ER (˚) |
||||
Pre |
34.40±4.18 |
28.05±9.60 |
27.58±9.29 |
30.01±7.69 |
Post |
29.58±7.24 |
28.55±3.55 |
30.80±6.35 |
29.64±5.71 |
24-Hrs |
32.60±8.27 |
28.80±3.50 |
30.15±7.05 |
30.52±6.27 |
Average |
32.19±6.56 |
28.47±5.55 |
29.51±7.56 |
- |
Lead Hip IR (˚) |
||||
Pre |
27.95±4.30 |
22.95±7.26 |
21.55±2.3E |
24.15±4.64 |
Post |
24.13±3.20 |
22.30±4.41 |
24.40±3.12 |
23.61±3.58 |
24-Hrs |
24.95±2.93 |
24.75±5.02 |
22.2±1.39 |
23.97±3.11 |
Average |
25.68±3.48 |
23.33±5.56 |
22.72±2.29 |
- |
Lead Hip ER (˚) |
||||
Pre |
35.95±11.71 |
30.65±6.88 |
29.05±7.58 |
31.88±8.72 |
Post |
34.38±4.75 |
31.93±6.56 |
31.45±9.15 |
32.58±6.82 |
24-Hrs |
32.98±5.67 |
29.73±6.65 |
32.18±10.40 |
31.63±7.57 |
Average |
34.43±7.38 |
30.77±6.70 |
30.89±9.04 |
- |
T Shoulder IR (˚) |
||||
Pre |
42.63±3.69 |
32.50±0.62 |
29.38±5.99 |
34.83±3.43 |
Post |
43.60±2.56 |
34.35±3.85 |
30.95±3.70 |
36.30±3.37 |
24-Hrs |
39.80±2.53 |
33.10±2.01 |
27.85±1.68 |
33.58±2.07 |
Average |
42.01±2.93*† |
33.32±2.16* |
29.39±3.79† |
- |
T Shoulder ER (˚) |
||||
Pre |
110.85±7.10 |
103.15±11.35 |
100.75±12.47 |
104.92±10.31 |
Post |
105.98±8.61 |
91.03±16.58 |
105.63±11.27 |
100.88±12.15 |
24-Hrs |
111.18±8.16 |
105.75±8.26 |
99.50±5.00 |
105.48±7.14 |
Average |
109.33±7.96 |
99.98±12.06 |
101.96±9.58 |
- |
NT Shoulder IR (˚) |
||||
Pre |
48.68±7.99 |
36.10±2.42 |
32.83±2.22 |
39.20±4.21 |
Post |
47.08±6.66 |
33.80±1.72 |
31.83±2.51 |
37.57±3.63 |
24-Hrs |
38.55±2.57 |
35.78±4.03 |
31.28±2.26 |
35.20±2.95 |
Average |
44.77±5.74*† |
35.23±2.72* |
31.98±2.33† |
- |
NT Shoulder ER (˚) |
||||
Pre |
106.775±8.90 |
103.30±16.46 |
94.28±7.22 |
101.45±10.86 |
Post |
105.63±12.02 |
95.75±15.72 |
102.30±10.58 |
101.23±12.77 |
24-Hrs |
103.50±7.17 |
95.55±14.22 |
96.65±15.75 |
98.57±12.38 |
Average |
105.30±9.36 |
98.20±15.47 |
97.74±11.18 |
|
IR = Internal Rotation, ER = External Rotation, T = Throwing, NT = Non-throwing. |
||||
*difference between pre-season and mid-season at significance level p < 0.05 |
||||
†difference between pre-season and post-season at significance level p < 0.05 |
Table 3:Isometric strength comparisons between Pre, Post, 24-hours following game at the time events of pre-season, mid-season, and post-season.
|
Pre-Season |
Mid-Season |
Post-Season |
Average |
|
Mean, SD |
Mean, SD |
Mean, SD |
Mean, SD |
Back Hip FR (kgf) |
||||
Pre |
11.55±0.90 |
14.13±4.14 |
14.65±1.18 |
13.44±2.07 |
Post |
11.20±1.25 |
13.10±1.59 |
13.35±2.32 |
12.55±1.72 |
24-Hrs |
11.58±1.13 |
12.73±4.33 |
14.25±0.57 |
12.85±2.01 |
Average |
11.44±1.09 |
13.32±3.53 |
14.08±1.36 |
- |
Back Hip ER(kgf) |
||||
Pre |
11.28±1.31 |
11.70±2.22 |
11.40±1.28 |
11.46±1.60 |
Post |
9.58±1.48* |
11.43±2.78 |
10.95±1.69* |
10.65±1.98 |
24-Hrs |
11.53±1.44 |
10.05±2.83 |
12.58±1.79 |
11.38±2.02 |
Average |
10.79±1.41 |
11.06±2.61 |
11.64±1.59 |
- |
Lead Hip FR (kgf) |
||||
Pre |
12.15±1.21 |
13.25±3.15 |
13.88±2.81 |
13.09±2.39 |
Post |
11.03±2.02 |
13.95±2.49 |
13.03±3.55 |
12.67±2.69 |
24-Hrs |
11.70±1.35 |
12.78±3.02 |
13.93±2.84 |
12.80±2.40 |
Average |
11.63±1.53 |
13.33±2.89 |
13.61±3.07 |
- |
Lead Hip ER (kgf) |
||||
Pre |
11.55±1.44 |
10.45±2.45 |
12.10±2.49 |
11.37±2.13 |
Post |
9.90±1.94 |
11.93±2.07 |
11.23±2.39 |
11.02±2.13 |
24-Hrs |
10.68±0.59 |
10.75±1.80 |
12.95±2.32 |
11.46±1 .57 |
Average |
10.71±1.32 |
11.04±2.11 |
12.09±2.40 |
- |
T Shoulder IR (kgf) |
||||
Pre |
11.00±1.44 |
12.10±1.96 |
11.03±0.97 |
11.38±1.46 |
Post |
10.38±1.40 |
10.43±2.16 |
11.93±1.19 |
10.91±1.58 |
24-Hrs |
10.58±0.79 |
10.90±1.86 |
11.15±1.35 |
10.88±1.33 |
Average |
10.65±1.21 |
11.14±1 .99 |
11.37±1.17 |
- |
T Shoulder ER (kgf) |
||||
Pre |
10.85±1.76 |
11.13±0.90 |
10.30±0.79 |
10.76±1.15 |
Post |
10.20±0.87 |
10.75±0.26 |
10.95±1.31 |
10.63±0.81 |
24-Hrs |
10.05±1.10 |
11.00±1 .41 |
11.10±1.25 |
10.72±1.25 |
Average |
10.37±1.24 |
10.96±0.86 |
10.78±1.12 |
- |
NT Shoulder IR (kgf) |
||||
Pre |
9.73±1.13 |
11.08±1.48 |
10.60±1.07 |
10.47±1.23 |
Post |
10.18±1.81 |
10.73±1.88 |
10.93±0.87 |
10.61±1.52 |
24-Hrs |
10.28±1.28 |
10.75±1.95 |
11.73±1.11 |
10.92±1.45 |
Average |
10.06±1.41 |
10.85±1.77 |
11.08±1.02 |
- |
NT Shoulder ER (kgf) |
||||
Pre |
9.93±2.05 |
10.60±1.54 |
10.25±2.44 |
10.26±2.01* |
Post |
10.38±1.79 |
10.43±1.47 |
10.90±1.62 |
10.57±1.63 |
24-Hrs |
11.75±1.71 |
11.15±0.73 |
10.65±1.91 |
11.18±1.45* |
Average |
10.68±1.85 |
10.73±1.25 |
10.60±1.99 |
- |
IR = Internal Rotation, ER = External Rotation, T =Throwing, NT =Non-throwing. |
||||
*significance level p < 0.05 |
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