The primary objective of the present study was to examine the effects of three resistance
training programs that varied in either inter-set rest interval length or volume of training on
the development of strength and muscle fiber size. Male subjects with a minimum of 1-
year of regular resistance training experience were randomly assigned to one of three, 8-
week training groups. The first set of all three programs was similar in that 10 repetitions
to failure were performed. In program A (n=5) the load (78% 1-RM) remained constant for
all subsequent sets. Program B (n=7) also used a constant load (80% 1-RM), however the
rest interval was reduced from 3 minutes (as in Program A) to 1 minute. Subjects in this
group performed additional sets to equate training volume with Program A. The training
load for Program C (n=7) was progressively reduced (80% to 70% 1-RM) before each
subsequent set to ensure the completion of 10 repetitions. Therefore, the volume
performed was greater than that of Programs A and B. Single arm elbow flexion 1-RM
increased by 12.3 +/- 3.5% in Program A, 16.5 +/-3.5% in Program B, and 14.1 +/- 4.7% in
Program C. Gains in 10-RM equaled 16.3 +/-4.1%, 18.0 +/- 5.0% and 13.9 +/- 3.1% for
Programs A, B and C, respectively. Although these increases in strength were significant
(p<.05), there were no differences in the magnitude of change between the three groups.
Increases in the cross-sectional area of type I and type II muscle fibers were similar after all
three training programs. The second objective of this investigation was to measure the
acute neuromuscular fatigue produced during a single session of each of the training
protocols incorporated in the longitudinal part of this study. Force and IEMG during
maximal isometric voluntary contractions (MVIC) along with blood lactate were assessed
prior to and upon the completion of each protocol. Subjects performed 3 sets of single-arm
elbow flexion to failure using a training load of approximately 77.3% 1-RM in Protocol A.
During Protocol B, subjects utilized the same constant resistance but the rest-intervals
between each set were 1 minute. Protocol C was designed to maintain the repetitions
completed per set at 10 while utilizing 3-minute rest interval. During Protocol C, the load
used during the first set was equal to that used during Protocol A and was then reduced by
about approximately 5% for each of the two subsequent sets. Protocol A and Protocol B
resulted in similar reductions in MVIC, whereas Protocol C (24.8 +/- 7.2%) resulted in a
significantly (p<.05) greater reduction in MVIC than Protocol A (20.2 +/- 7.7%). Protocols
A and B elicited similar reductions in the force-time curve of the MVIC. A significantly
greater reduction in the final 300ms of the force-time curve was observed following
Protocol C (in comparison to Protocol A) (p<.05). There were no significant changes in
IEMG after subjects performed protocols A and B. A significant time effect (with no
interaction effect) in IEMG was observed following the comparison of Protocol A with
Protocol C. Blood lactate increased significantly in response to all three protocols with no
differences between the protocols. The third objective of this study was to compare the
magnitude of resistance training-induced acute fatigue before and after the completion of 8
weeks of resistance training specific to the fatigue protocols used. The magnitude of
resistance training-induced acute neuromuscular fatigue remained unchanged following the
resistance training programs. The results appear to indicate that acute neuromuscular
fatigue produced during resistance training may not be associated with the chronic
increases in muscle strength and size. / Graduate
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/10184 |
| Date | 25 October 2018 |
| Creators | Brandenburg, Jason Peter |
| Contributors | Docherty, David |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
| Rights | Available to the World Wide Web |
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