Comparing the aerobic demand of various pieces of accessible exercise equipment in individuals with multiple sclerosis
AuthorSnyder, Kaitlyn JG
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AbstractCurrent research in the effectiveness of different aerobic exercise modalities for individuals with MS is incomplete. The primary aim of this study is to compare the aerobic response of six selected pieces of accessible exercise equipment at a moderate intensity, as indicated by the current exercise guidelines for individuals with MS. Exercise equipment preference was evaluated using a questionnaire. Participants (n=10) performed a steady-state exercise test on an arm ergometer, arm-leg recumbent stepper, body weight supported treadmill, arm-leg functional electrical stimulation (FES) recumbent stepper, arm FES cycle ergometer, and leg FES cycle. The average VO2 (mlkgmin-1) was recorded on each piece of equipment. Here, the body weight support treadmill, arm leg FES recumbent stepper, and the arm leg stepper were significantly more aerobically demanding than the arm ergometer (p<.05). Further, there were no differences in pain (p> .05), safety (p> .05), enjoyment (p >.05), or anticipated adherence to exercise guidelines in duration (p >.05) or frequency (p> .05). In this study, all forms of accessible aerobic exercise were equally aerobically demanding and preferred in individuals with MS, with the exception of the arm ergometer being less aerobically demanding.
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The effect of a weighted-vest strength and balance training program on obstructed walking in postmenopausal womenSlack, Jill Patricia.; Applied Health Sciences Program (Brock University, 2003-05-21)SUMMARY Background: Age related declines in lower extremity strength have been associated with impaired mobility and changes in gait patterns, which increase the likelihood of falls. Since community dwelling adults encounter a wide range of locomotor challenges including uneven and obstmcted walking surfaces, we examined the effect of a strength 11 and balance exercise program on obstructed walking in postmenopausal women. Objectives: This study examined the effect of a weighted-vest strength and balance exercise program on adaptations of the stance leg during obstacle walking in postmenopausal women. Methods: Eighteen women aged 44-62 years who had not engaged in regular resistance training for the past year were recruited from the St. Catharines community to participate in this study. Eleven women volunteered for an aerobic (walking), strength, and balance training program 3 times per week for 12 weeks while 7 women volunteered as controls. Measurements included: force platform dynamic balance measure of the center of pressure (COP) and ground reaction forces (GRFs) in the stance leg while going over obstacles of different heights (0,5, 10,25 and 30 cm); and isokinetic strength measures of knee and ankle extension and flexion. Results: Of the 18 women, who began the trial, 16 completed it. The EX group showed a significant increase of 40% in ankle plantar flexion strength (P < 0.05). However, no improvements in measures of COP or GRFs were observed for either group. Failure to detect any changes in measures of dynamic balance may be due to small sample size. Conclusions: Postmenopausal women experience significant improvements in ankle strength with 12 weeks of a weighted-vest balance and strength training program, however, these changes do not seem to be associated with any improvement in measures of dynamic balance.
Training distribution and the acquisition of maximal isometric elbow flexion strengthCalder, Kristina M.; Applied Health Sciences Program (Brock University, 2004-07-14)Twenty-six sedentary, college-aged females were matched and randomly assigned to one of two groups. The massed group (n=13) completed 15 maximal isometric elbow flexion strength trials in one session, while the distributed group (n=13) performed five such contractions on three successive days. After a two-week and three month rest interval, both groups returned to perfonn another five maximal isometric elbow flexion strength trials to assess retention of any potential strength gains. Elbow flexion torque and surface electromyography (SEMG) of the biceps and triceps were monitored concurrently. There was a significant (P < 0.05) increase in strength in both groups from block one (first five contractions) to block four (first retest) and from block one to block five (second retest). Both groups exhibited a similar linear increasing (P < 0.05) trend in biceps root-mean-square (RMS) SEMG amplitude. A significant (P < 0.05) decrease in triceps RMS SEMG amplitude was found between block one and block four for the distributed group. However, a significant (P < 0.05) increase was then found between block one and five for the massed group, and between blocks four and five for distributed group. These results suggest that there is flexibility in resistive exercise schedules. An increase in neural drive to the agonist muscle continued throughout testing. This was accompanied by a reduction in antagonist co activation that was a short-tenn (two weeks) training effect, dissipated over the longer rest interval (three months).
The effects of a general excercise program on task self-efficacy and social physique anxiety in older adultsRansom, Kerry; Applied Health Sciences Program (Brock University, 2011-03-08)Older adults represent the most sedentary segment of the adult population, and thus it is critical to investigate factors that influence exercise behaviour for this age group. The purpose of this study was to examine the influence of a general exercise program, incorporating cardiovascular, strength, flexibility, and balance components, on task selfefficacy and SPA in older adult men and women. Participants (n=114, Mage = 67 years) were recruited from the Niagara region and randomly assigned to a 12-week supervised exercise program or a wait-list control. Task self-efficacy and SPA measures were taken at baseline and program end. The present study found that task self-efficacy was a significant predictor of leisure time physical activity for older adults. In addition, change in task self-efficacy was a significant predictor of change in SPA. The findings of this study suggest that sources of task self-efficacy should be considered for exercise interventions targeting older adults.