title: The effect of resistance-training intensity on strength-gain response in the older adult.
abstract: This study examined how training intensity affects strength gains in older adults over an 18-week training period using nonperiodized, progressive resistance-training protocols. Untrained men and women participants were separated into 4 groups: group A (n = 17, 71.4 +/- 4.6 years) performed 2 sets of 15 repetitions maximum (RM), group B (n = 13, 71.5 +/- 5.2 years) performed 3 sets of 9 RM, group C (n = 17, 69.4 +/- 4.4 years) performed 4 sets of 6 RM, group D (n = 14, 72.3 +/- 5.9 years) served as controls. Training groups exercised 2 days/week performing 8 resistance exercises. Except for training intensity, the acute program variables were equated between groups. A 1RM for 8 exercises was obtained every 6 weeks. The total of 1RM for the 8 exercises served as the dependent variable.
  
  
  RESULTS
  repeated measures analysis of variance (ANOVA) and Scheffe post hoc revealed that, at 6 weeks, only groups B and C were significantly stronger than group D (p < 0.01). By weeks 12 and 18, all training groups were significantly stronger than controls (p < 0.01). However, no difference existed between groups A, B, and C at any time. The data suggests that, for protocols with equated acute program variables, strength gain is similar over 18 weeks for training intensities ranging from 6 to 15 RM in previously untrained older adults. When programming nonperiodized, progressive resistance exercise for novice senior lifters, in the initial phases of the program, a wide range of intensities may be employed with similar strength gain.
authors.affiliation: Center for Orthopaedic and Biomechanics Research, Department of Kinesiology, Boise State University, Boise, ID 83725, USA.
authors.forename: Chad
authors.initials: C
authors.lastname: Harris
authors.forename: Mark A
authors.initials: MA
authors.lastname: DeBeliso
authors.forename: Terry A
authors.initials: TA
authors.lastname: Spitzer-Gibson
authors.forename: Kent J
authors.initials: KJ
authors.lastname: Adams
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology*; D010806:Physical Education and Training / Q000379:methods*