Neuromuscular fatigue effects on Hamstring to Quadriceps Ratio in young female players

Oriol Nevot Casas; Montserrat Pujol Marzo; Berta Moreno Planes; Azahara Fort Vanmeerhaeghe

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Neuromuscular fatigue effects on Hamstring to Quadriceps Ratio in young female players

Oriol Nevot-Casas ^[1] ; Montse Pujol-Marzo ^[1] ; Berta Moreno-Planes ^[1] ; Azahara Fort-Vanmeerhaeghe ^[2]
1. [1] Generalitat de Catalunya
  
  Generalitat de Catalunya
  
  Barcelona, España
2. [2] Universitat Ramon Llull
  
  Universitat Ramon Llull
  
  Barcelona, España
Localización: Apunts: Medicina de l'esport, ISSN 0213-3717, ISSN-e 1886-6581, Vol. 55, Nº 208, 2020, págs. 137-142
Idioma: inglés
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Resumen
- Introduction Two of the main modifiable risk factors for suffering an injury in the anterior cruciate ligament are known to be the Hamstring-to-Quadriceps (H/Q) Ratio and neuromuscular fatigue.
  
  The main purpose of this research was to study the effect of neuromuscular fatigue on the H/Q Ratio and the maximum isometric strength of the quadriceps and hamstrings in teenage female basketball and handball players.
  
  Material and methods This is an experimental, pre-post intervention study with a sample of 19 female basketball players and 11 female handball players (17.02±1.19 yo, 177.8±7.2cm and 68.6±9.3kg). To assess muscle strength, a maximum isometric strength test was performed in a 90° hip and 60° knee position. The H/Q Ratio was then calculated. The 30–15 Intermittent Fatigue Test (30–15 IFT) was used to induce fatigue, measured using the Rating of Perceived Exertion (RPE) scale. A descriptive analysis and a Student's t-test were performed to study the differences in the H/Q Ratio, muscle strength and pre-post intervention fatigue.
  
  Results Although the H/Q Ratio decreased after the 30–15 IFT, the differences were not statistically significant. Regarding strength values, the right and left quadriceps presented strength reductions of 4.52% and 5.55%, respectively. The reduction in strength was statistically significant (p≤0.05), especially in the right hamstring (7.3%) and in the left hamstring (7.5%).
  
  The study conclusions suggest that leg muscular strength decreases after a fatigue test and that there is a tendency for the H/Q Ratio to decrease also.