The effects of complex resistance training of the hip flexor musculature on acceleration performance in Rugby League playersDaniel Weaving (200875933)

Background

Acceleration in Rugby League

• Four accelerations per minute (Sirotic et al. 2009)

• Forwards- 10 metres (Gabbett, Jenkins & Abernethy, 2011)

• Backs- 40 metres (Meir, 1993)

• Tackling performance indicator

(Gabbett, Jenkins & Abernethy, 2011)

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Anatomy of the Hip flexor musculature. Taken from

Andersson, Nilsson & Thorstensson (1997)

Swing Phase (Bosch & Klomp, 2005)

Speed correlates (Dowson et al. 1998)

Hip Flexion

One study (Deane et al. 2005)

Focus on hip extensors (Wiemann & Tidow, 1995)

Aim & Hypotheses

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Hypothesis

Increase in hip flexion strength as a result of complex training would enhance the

acceleration performance of Rugby League players further than resistance training only

Research Method and DesignHip Flexion

•Dynamometer

•60, 270 & 450os-1

• 5 reps

Acceleration

•Standing start

• Timing gates

• 10, 20 & 30m

Pre & Post Test(15 subjects)

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6-week training protocol

Resistance

Reps

6 (Peterson, Rhea & Alvar

(2005)

Sets

4

Complex

Resistance Plyometrics

50 foot contacts (Chu, 1998)

Control

No training

Statistical Analysis

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• Paired t-tests

– Pre & Post test data

• One- way analysis of variance (ANOVA)

– Interactions between experimental groups

• Tukeys HSD post hoc

– Multiple comparisons between experimental groups

• 0.05 level of significance

Results

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Resistance Training Complex Training Control Group

Measure Pre-test Post test Pre-test Post test Pre-test Post test

10-m time (s) 1.930

(0.15)

1.844

(0.09)

1.932

(0.08)

1.886

(0.08)

1.974

(0.10)

1.984

(0.09)

20-m time (s) 3.278

(0.2)

3.144

(0.14)

3.364

(0.16)

3.192

(0.15)* ¥

3.314

(0.16)

3.374

(0.08)

30-m time (s) 4.552

(0.24)

4.370

(0.21)* ¥

4.641

(0.22)

4.469

(0.21)* ¥

4.604

(0.19)

4.645

(0.16)

Results

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Resistance Training Complex Training Control Group

Measure Pre-test Post test Pre-test Post test Pre-test Post test

60o.s-1 HF

TRQ (N.m)

153.1

(51.7)

177.9

(44.1)* ¥

140.9

(25.9)

159.1

(36.3)* ¥

164.4

(53.5)

162.5

(56.2)

270o.s-1 HF

TRQ (N.m)

108.5

(22.7)

119.5

(13.7)

122.8

(36.6)

142.36

(28.2)

100.9

(20.2)

101.0

(21.9)

450o.s-1 HF

TRQ (N.m)

112.7

(48.8)

119.5

(46.0)

111.8

(19.3)

159.0

(36.5)* ¥Ῐ

127.2

(33.7)

123.9

(36.2)

Discussion

Conflicts (Deane et al. 2005)

Stance Phase

10mRFD increase

SSC Psoas (Novacheck, 1998)

20mComparable (Dowson et al. 1998)

Swing leg recovery

30m

Discussion

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Useful for Rugby League players

Forwards

Sprint no more than 10m (Meir,

1993)

Backs

Increased frequency

of 20m carries

Attacking plays (Meir,

1993)

Conclusions

• Useful training method

• Complex training– More research needed

• Mechanisms unknown– 3-D Kinematic Analysis

Questions

References

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Bosch, F. & Klomp, R. (2005). Running: Biomechanics and Exercise Physiology applied in Practice. Netherlands: Elsevier

Deane, R.S., Chow, J.W., Tillman, M.D. & Fournier, K.A. (2005). Effects of Hip Flexor Training on Sprint, Shuttle Run, and Vertical Jump Performance. [Electronic version]. Journal of Strength and Conditioning Research, 19 (3), pp 615-621

Dowson, M.N., Nevill, M.E., Lakomy, H.K.A., Nevill, A.M. & Hazeldine, R.J. (1998). Modelling the relationship between isokinetic muscle strength and sprint running performance. [Electronic version]. Journal of Sports Sciences, 16, pp 257-265

Ebben, W.P. (2002). Complex Training: A Brief Review. [Electronic version]. Journal of Sports Science and Medicine, 1, pp 42-46

References

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Gabbett, T.J., Jenkins, D.G. & Abernethy, B. (2011). Correlates of Tackling Ability in High-Performance Rugby League Players. [Electronic version]. Journal of Strength and Conditioning Research, 25 (1), pp 72-79

Novacheck, T.F. (1998). The biomechanics of running. [Electronic version] Gait and Posture, 7, pp 77-95

Meir, R., Arthur, D., & Forrest, M. (1993). Time and motion analysis of professional rugby league: A case study. Strength and Conditioning Coach, 1, pp 24 – 29.

Peterson, M.D., Rhea, M.R. and Alva, B.A. (2005) Applications of the dose-response for muscular strength development: a review of meta-analytic efficacy and reliability for designing training prescription. [Electronic version]. Journal of Strength and Conditioning Research, 19, 950-958.

References

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Sirotic, A., Coutts, A.J., Knowles, H. & Catterick, C. (2009). A comparison of match demands between elite and semi-elite rugby league competition. [Electronic version]. Journal of Sports Sciences, 27 (3), pp 203-211

Wiemann, K. & Tidow, G. (1995). Relative activity of hip and knee extensors in sprinting- implications for training. [Electronic version]. New studies in Athletics, 10, pp 29-49