Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy.
Br J Sports Med
; 49(19): 1277-83, 2015 Oct.
Article
en En
| MEDLINE
| ID: mdl-25979840
ABSTRACT
BACKGROUND:
Few interventions reduce patellar tendinopathy (PT) pain in the short term. Eccentric exercises are painful and have limited effectiveness during the competitive season. Isometric and isotonic muscle contractions may have an immediate effect on PT pain.METHODS:
This single-blinded, randomised cross-over study compared immediate and 45â min effects following a bout of isometric and isotonic muscle contractions. Outcome measures were PT pain during the single-leg decline squat (SLDS, 0-10), quadriceps strength on maximal voluntary isometric contraction (MVIC), and measures of corticospinal excitability and inhibition. Data were analysed using a split-plot in time-repeated measures analysis of variance (ANOVA).RESULTS:
6 volleyball players with PT participated. Condition effects were detected with greater pain relief immediately from isometric contractions isometric contractions reduced SLDS (mean±SD) from 7.0±2.04 to 0.17±0.41, and isotonic contractions reduced SLDS (mean±SD) from 6.33±2.80 to 3.75±3.28 (p<0.001). Isometric contractions released cortical inhibition (ratio mean±SD) from 27.53%±8.30 to 54.95%±5.47, but isotonic contractions had no significant effect on inhibition (pre 30.26±3.89, post 31.92±4.67; p=0.004). Condition by time analysis showed pain reduction was sustained at 45â min postisometric but not isotonic condition (p<0.001). The mean reduction in pain scores postisometric was 6.8/10 compared with 2.6/10 postisotonic. MVIC increased significantly following the isometric condition by 18.7±7.8%, and was significantly higher than baseline (p<0.001) and isotonic condition (p<0.001), and at 45â min (p<0.001).CONCLUSIONS:
A single resistance training bout of isometric contractions reduced tendon pain immediately for at least 45â min postintervention and increased MVIC. The reduction in pain was paralleled by a reduction in cortical inhibition, providing insight into potential mechanisms. Isometric contractions can be completed without pain for people with PT. The clinical implications are that isometric muscle contractions may be used to reduce pain in people with PT without a reduction in muscle strength.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tendinopatía
/
Terapia por Ejercicio
/
Voleibol
/
Analgesia
Tipo de estudio:
Clinical_trials
Límite:
Adolescent
/
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Br J Sports Med
Año:
2015
Tipo del documento:
Article
País de afiliación:
Australia