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• W2955882364 abstract "PURPOSE: Power affects quality of life and sports performance across age. Plate-loaded machines are the most common equipment used by recreational lifters; however, no studies have determined the optimal loads that maximize power outputs using this equipment. METHODS: Fourteen older men (69.4 ± 6.7 y), 21 older women (69.8 ± 7.9 y), 24 young men (21.0 ± 2.2 y) and 22 young women (20.7 ± 1.5 y) participated in two sessions of strength and power testing. They performed ten different plate-loaded exercises to determine their maximum dynamic strength (1RM) and peak power output (PP). Power was tested at 40, 50, 60, 70 and 80% 1RM using a linear position transducer. PP was expressed relative to the highest power produced (PPREL). RESULTS: Significant sex x load interactions were seen for all upper body lifts (p<.05). Post hoc analyses showed that for multi-joint upper body exercises, men reached their highest PPREL at the low end of the loading spectrum (chest press and seated row: 40-60%1RM; shoulder press: 40-70%1RM), while women’s highest PPREL was at higher loads (50-70%1RM). For single joint upper body exercises, the biceps curl and triceps extension showed no differences in PPREL across loads for men, while women’s optimal loads were at 50-80%1RM for both exercises. For shoulder press and biceps curl there were also age x load interactions (p<.05). Younger persons reached PPREL at 40%1RM and 50-60%1RM, respectively and older persons at 60-70%1RM and 50-80%1RM, respectively. For lower body exercises, leg press, leg curl and hip abduction showed a significant main effect for load (p<.033) with optimal load at 60-70%1RM, 50-70%1RM, and 50-60%1RM, respectively. Hip adduction produced significant age x load (p<.031) and sex x load (p<.034) interactions. 50-70%1RM was optimal for both age groups, but older persons produced significantly higher PPREL at 40%1RM. For load x sex, optimal load was 50-70%1RM for both sexes; however, PPREL occurred at 70%1RM for men and 50%1RM for women. Analysis for the calf raise showed a significant age x load interaction (p<.001) where PPREL was 40-70%1RM for young and 50-80%1RM for older participants. CONCLUSIONS: Different optimal load ranges are required for individual plate-loaded exercises depending on age and sex. Younger persons and men optimize power at lower loads than older persons and women." @default.
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• W2955882364 date "2019-06-01" @default.
• W2955882364 modified "2023-09-23" @default.
• W2955882364 title "Optimal Loads for Power in Young and Old Men and Women Using Plate-Loaded Resistance Machines" @default.
• W2955882364 doi "https://doi.org/10.1249/01.mss.0000561124.56070.20" @default.
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