Recent studies have demonstrated that increases in dynamic strength after weight-training in healthy subjects
were associated with reductions in heart rate (HR) and arterial blood pressure (ABP) during formal lifting of
identical absolute loads (McCartney et al., 1989; Sale et al., 1990). This study investigated whether the effect
could be transferred to strength-related activities of daily living in healthy older men. The effects of 10 weeks (30
sessions) of progressive dynamic weightlifting training on HR and ABP in 10 weight-trained (wttrain) subjects were
compared with 5 control subjects. Before and after training intra-brachial artery pressure and HR were monitored
continuously during: 10 repetitions of single-arm curl (SAC) and single-arm military press (SAMP) at 70 % of initial 1
repetition maximum (1 RM); 12 repetitions of single- (SLP) and double-leg press (DLP) exercise at 80% of initial 1 RM; 10 mins treadmill walking at 2.5 mph, carrying 20 and 30 pound loads between mins 4-6 and 8-10 respectively (T-10); 4 mins of treadmill walking at 3.0 mph up an incline of 8% (T-4); 12 flights of stairclimbing at 60 steps/min on a Stairmaster 6000 Ergometer (STR). In the wttrain group the 1 RM in SAC, SAMP, SLP and DLP increased overall by 61 (p < 0.007), 30 (p < 0.001), 27 (p<0.001) and 27 per cent (p < 0.001), respectively. After training the mean maximal systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR), and rate-pressure product (RPP; 10^3) values in all 4 weightlifting exercises were lower. The decreases were only significant however, for the DBP in the SAC (144.0 ± 14.9 to 110.0 ± 5.2 Torr; p < 0.001), SAMP (151.0 ± 5.9 to 144.0 ± 5.4 Torr; p < 0.007), the MAP for the DLP ( 154.0 ± 5.0 to 147.0 ±5.0 Torr; p < 0.021) and RPP for the SAC (22.7 ± 2.2 to 19.1 ± 1.4; p < 0.041). The same respective measurements in the control group were either unchanged or higher. After training, there were overall reductions in the SBP (p < 0.05, mins 8-10), DBP , MAP and RPP (P < 0.05, mins 1-4) responses during T-10 with consistently higher values found in the control group. Similar, but nonsignificant patterns emerged for T-4. In contrast, there was little or no reduction in any of the measured parameters during stairclimbing. It was concluded that improved strength in older subjects results in an attenuated HR and ABP response during weightlifting, and there is a modest transfer of this effect to certain activities of daily living which involve the trained muscles. / Thesis / Master of Science (MSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/24559 |
| Date | 09 1900 |
| Creators | Gibson, Sally |
| Contributors | McCartney, Neil, Human Biodynamics |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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