The effect of simulated soccer match play on hip strength

Forsdyke, Dale, Salter, Jamie, Weston, Matt and Cresswell, Richard (2018) The effect of simulated soccer match play on hip strength. In: XXVI Isokinetic Medical Group Conference, Football Medicine Outcomes: Are We Winning, 2nd June 2018 - 4th June 2018, Barcelona. (Submitted)

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Introduction and purpose
Hip and groin injuries are a common and frequently complex problem in intense multidirectional sports such as soccer (1,2). Whilst the aetiology is thought to be multifactorial, previous research has highlighted a loss of hip muscle strength to be an important internal risk factor in the development of hip and groin injury (2). During soccer match play hip strength deficiency due to fatigue and the magnitude of this change in strength may increase the risk of injury. Therefore, the purpose of study was to investigate the effect of multidirectional soccer match play on hip muscle strength.

Seventy one male international soccer academy players (age 19.2 ±0.9, height 175.9cm ±5.8, weight 73kg ±8.2) provided consent and were recruited to the study. All players completed a 90-minute simulated soccer match play protocol using the Soccer Specific Aerobic Field Test (SAFT90, 3). Isometric strength of the players left and right hip adductor and abductor muscles was tested at 450 hip flexion using a Groinbar (Vald Performance, Queensland, Australia). Testing of hip muscle strength took place at baseline, during a standardised half time interval, and at full time upon SAFT90 completion. The SAFT90 was carried out in small groups (range 5-9 players) on a familiar synthetic pitch surface, with testing carried out over a period of eight weeks. We employed a magnitude-based inference (MBI) approach to the data analysis with the magnitude of all fixed effects interpreted using a threshold of 0.2 of the between-subject standard deviation derived from mixed linear modelling using 90% confidence intervals. Given the preliminary nature of our study, we adopted a conservative approach to inference whereby substantial effects were only declared when the probability likelihood for the effect was ≥75%.

Both hip adductor and abductor muscle strength decreased as a result of participation in the SAFT90 (Table 1). Analysis using MBI’s found that there was substantial (e.g. at least a likely) negative change when comparing baseline muscle adductor and abductor strength to half time and full time. This means a >75% probability participating in the SAFT90 negatively effected players hip strength. All measurements of hip strength at baseline compared to full time found a mostly likely (100%) negative change.

The findings from this study suggest that soccer match play leads to a substantial (>75% probability) reduction in hip adductor and abductor muscle strength. The greatest negative change was seen comparing baseline hip strength to full time strength. These results together with previous research (2) infer that towards the end of each half, and in particular the second half players may be vulnerable to hip and groin injury. This also highlights the risk of frequent soccer match play with insufficient recovery to restore hip strength may further compound this, albeit no direct injury measurement was taken. Practitioners should seek to condition hip muscle strength and resistance to fatigue, whilst ensuring sufficient recovery from match play to manage the risk of hip and groin injury and re-injury.

1. Werner J, Hägglund M, Waldén M, and Ekstrand J. UEFA injury Study: a prospective Study of hip and groin inuries in profesional Football over seven consecutive seasons. Br J Sports Med 2009; 43:1036-1040.
2. Whittaker J, Small C, Maffey L, and Emery C. Risk factors for groin injury in sport: an updated systematic review. Br J Sports Med 2015; 49:803-809.
3. Lovell R, Knapper B, and Small K. Physiological responses to SAFT90: a new soccer-specific match simulation. In: Verona-Ghirada Team Sports Conference Proceedings 2008.

Item Type: Conference or Workshop Item (Speech)
Status: Submitted
Subjects: R Medicine > R Medicine (General)
School/Department: School of Sport
URI: http://ray.yorksj.ac.uk/id/eprint/2776

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