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- W2074430518 abstract "582 The hypothesis tested was that resistance training by older women would reduce susceptibility to muscular weakness and injury caused by an unaccustomed bout of eccentric (Ecc) exercise. Six women (age 66±5 yr) participated in 12 weeks of resistance training of the quadriceps femoris (QF) muscles. Subjects trained twice a week, 3-5 sets of 8-12 repetitions to failure. Unilateral concentric (Con) and Ecc one repetition maximum (1RM) were determined before and after training. Then an unaccustomed Ecc exercise bout(10 sets of 10 Ecc actions) with a weight equivalent to the Con 1RM for the test leg was completed. The Ecc bout was performed with one leg with the contralateral leg as a control. Test and control legs were reversed following training. Con and Ecc 1RM were assessed again on days 1, 3, 4, 7, 9, and 11 following the Ecc bout. Cross-sectional area (CSA) and muscle T2 for the QF were determined by magnetic resonance imaging (MRI) at rest and on day 3 following the Ecc bout. Prior to training, both Con and Ecc 1RM declined by 25% on the first day following the ecc bout (p=0.0001). Con strength returned to normal 9 days after the Ecc bout (p=0.26), while the decline in Ecc strength remained significant through day 3 (p=0.003). As assessed by MRI, 15% of the total CSA of the test leg showed elevated T2 (presumed to be injury) compared to 1% in the control limb (p<0.023). The training protocol elicited a 14% and 17% increase in Con and Ecc 1 RM, respectively (p=0.001). Post-training, Con and Ecc 1RM strength declined 15%, and 12% on the first day following the Ecc bout, (p=0.0001). Both Con and Ecc strength had returned to normal by day 3 (p=0.21, p=0.36). Post-training, only 4% of the total CSA of the test leg showed elevated T2 (injury) on the MRI scans compared to <1% in control limb. An unaccustomed bout of Ecc exercise caused a significant and prolonged loss of strength in untrained older women. Twelve weeks of resistance training attenuated this response as evidenced by both smaller strength loss and a faster recovery." @default.
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- W2074430518 date "1998-05-01" @default.
- W2074430518 modified "2023-09-26" @default.
- W2074430518 title "RESISTANCE TRAINING REDUCES SUSCEPTIBILITY TO ECCENTRICALLY-INDUCED MUSCULAR WEAKNESS AND INJURY IN OLDER WOMEN" @default.
- W2074430518 doi "https://doi.org/10.1097/00005768-199805001-00582" @default.
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