Isokinetic adaptations of knee extensors and flexors after aerobic walk training in old sedentary women.
Dr Pierre Louis BERNARDa, Dr Guillaume TALLONa, Prof Gregory NINOTb, Mrs Audrey JAUSSENTc, Dr Olivier COSTESd, Dr Sofiane RAMDANIa, Mrs Marie-Christine PICOTc, Prof Hubert BLAINe
a UFR APS. Euromov M2H, b UFR APS. Epsylon, c CHU montpellier. DIM, d DRJSCS Montpellier, e CHU Montpellier. Pole gérontologique A. Balmes
We examined the effects of active walk training 3 days per week, for 24 weeks on isokinetic peak torque (PT) and mean power (MP) of the knee extensors and flexors of osteopenic sedentary old women.
The population was composed by 121 women (65,5 +/- 4,2 years) with 5.3 (+/- 1.7) to the Physical Activity Scale for the Elderly (PASE) and 86% of the theoritical distance of the 6 minute walk test (6MWT). The women were eligible to participate if they had no medical contrindication and were not diagnosed with major motor and neurocognitive dysfonctions. The isokinetic performance of the knee extensors and flexors in both limbs was measured on Biodex System 3® in concentric/concentric condition on 80° range of motion.
The experimental protocol consisted in 5 maximal effort performed at 60°/sec, 60 second of rest inerval and 5 maximal effort at 180°/sec. After 5 minutes of rest, identical paradigm was performed on contro-lateral side. Experimental group performed aerobic walk training: 1) between 60 and 80% of maximal heart rate; 2) with a distance between 1500 to 4500 meters at the end of the training; 3) with a total time effort between 25 to 45 minutes at the end of the training.
Our results showed significant increase of PT of hamstring in dominant side at 180°/sec (p<0.01). We observed significant differences in the experimental group for the hamstring at 60°/sec for the dominant side (p<0.02) and the no-dominant side (p<0.01). For MP, no interaction was observed between groups and time. For the hamstring, we observed significant increase in the experimental group at 60°/sec on the no-dominant side (p<0.05).
Our results indicate a moderate effects of the aerobic walk training performed during 6 months on the peak torque and the mean power of isokinetic knee extensors and flexors in old sedentary women.