Int J Sports Med 2012; 33(02): 137-141
DOI: 10.1055/s-0031-1291224
Training &Testing
© Georg Thieme Verlag KG Stuttgart · New York

MMP−2 Expression in Skeletal Muscle after Strength Training

A.P. L. Deus
1   UFSCar, Physiotherapy, Sao Carlos, Brazil
,
D. Bassi
1   UFSCar, Physiotherapy, Sao Carlos, Brazil
,
R. P. Simões
1   UFSCar, Physiotherapy, Sao Carlos, Brazil
,
C. R. Oliveira
2   Federal University of Sao Carlos, Medicine Department, Sao Carlos, Brazil
,
V. Baldissera
3   UFSCar, Physiological Sciences, Sao Carlos, Brazil
,
R. de Cássia Marqueti
4   Universidade Federal de São Carlos, Ciências Fisiológicas, São Carlos, Brazil
,
H.S. S. Araujo
4   Universidade Federal de São Carlos, Ciências Fisiológicas, São Carlos, Brazil
,
R. Arena
5   University of New Mexico, Department of Orthopaedics and Rehabilitation, Albuquerque, United States
,
A. Borghi-Silva
1   UFSCar, Physiotherapy, Sao Carlos, Brazil
› Author Affiliations
Further Information

Publication History



accepted after revision 12 September 2011

Publication Date:
17 November 2011 (online)

Abstract

The aim of this study was to assess the effects of resistance training on ladders (RTL) on MMP−2 expression and blood lactate concentration [La−]. 30 male (3 months of age), albino rats were divided into 3 groups: sedentary control (SC, n=10), low resistance exercise training (Low-IntRT, n=10) and high-intensive exercise training (High-IntRT, n=10). Animals of High-IntRT were submitted to a progressively increasing overload in relation to body weight until exhaustion, while the Low-IntRT group performed the same exercise regimen with no external load. The program had a frequency of 3 times per week over 8 weeks. MMP−2 expression of tibialis anterior muscle and [La−] were measured. While there was a significant increase of MMP−2 (pro-form) in both groups, only High-IntRT significantly increased MMP−2 in active-form (p<0.05). Both trained groups exhibited an increase in [La−] when compared to controls, however, the increase in [La−] was significantly higher in the High-IntRT compared to Low-IntRT (p<0.05). Strong correlation was found between MMP−2 (active form) and [La−] in High-IntRT (r=0.91). RTL in using low and high-intensity exercise can serve as a model to demonstrate different responses of MMP−2 expression in an animal model. It appears active form expression of MMP−2 is modulated by exercise intensity.

 
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