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Older women participated in a 12-week high-speed resistance training program under two supervisor-to-subject ratio methods (i.e., high versus low supervision) to assess its effects on muscle strength, power, functional performance, and quality of life assessed before (T1) and after (T2) intervention. Women were divided into either the control group (CG, n = 15), high supervision group (HSG, n = 30), or low supervision group (LSG, n = 28). The training program included exercises requiring high-speed concentric muscle actions. No differences were observed among groups at T1. Between T1 and T2, the HSG showed a higher (p < .05) improvement in muscle strength (ES = 0.36–1.26), power (ES = 0.5–0.88), functional performance (ES = 0.52–0.78), and quality of life (ES = 0.44–0.82) compared with LSG and CG. High-speed resistance training under closer supervision is more effective for improving muscle strength, power, functional performance, and quality of life in older women.

Ramírez-Campillo is with the Department of Physical Activity Sciences, Research Nucleus in Health, Physical Activity and Sport, Universidad de Los Lagos, Osorno, Chile; and the Laboratory of Exercise Sciences, MEDS Clinic, Santiago, Chile. Martínez is with the Department of Physical Education, Sport and Recreation, Universidad de La Frontera, Temuco, Chile. De La Fuente is with Career of Kinesiology, UDA Health Sciences, Faculty of Medicine, Pontificia Universidad Católica, Santiago, Chile. Cadore is with the Department of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil. Marques is with the Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal; and the Department of Sport Sciences, University of Beira Interior, Covilhã, Portugal. Nakamura is with the Department of Physical Education, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Campus Universitário, Londrina, Brazil. Loturco is with NAR—Nucleus of High Performance in Sport, São Paulo, SP, Brazil. Caniuqueo is with the Laboratory of Physiology and Biomechanics, Universidad Autónoma de Chile, Temuco, Chile. Cañas is with Laboratorio de Fisiología, Departamento de Ciencias Biológicas, Facultad de Ciencias Biológicas, Universidad Andres Bello, Viña del Mar, Chile; and Escuela de Kinesiología, Facultad de Medicina, Universidad Diego Portales, Chile. Izquierdo is with the Department of Health Sciences, Public University of Navarre, Navarre, Spain.

Address author correspondence to Mikel Izquierdo at