Lower extremity strength training effects on balance and postural control in female elderly
- Authors: Rosenblatt, Desmarie
- Date: 2020
- Subjects: Muscle strength
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/46359 , vital:39595
- Description: Background: The global, exponential growth in the elderly population and increased longevity has been well documented. South Africa has the highest proportion of older population in sub-Saharan Africa. Empirical research is lacking on the efficacy of exercise interventions for the elderly to prevent fall risk and increase independent living associated with quality of life. Maintenance of muscular strength of the lower body is important to compensate for various physiological deficits due to the ageing process. Aim: The aim of the study was to determine the effects of an eight-week lower extremity strength training intervention on balance and postural control in female elderly, aged 65 years and older, living in a high socio-economic, urban, residential area in Nelson Mandela Bay in the Eastern Cape region of South Africa. Design and Methods: A true-experimental, pre-test, post-test study design, was used with a comparative experimental and control group. A total number of 21 participants met the inclusion criteria and were randomly assigned to an experimental or control group. The experimental group participated in an eight-week strength training intervention, attending exercise sessions, twice a week. Peak isometric strength of the knee flexors/extensors, adductors/abductors of the hip, and plantar / dorsi-flexors of the ankle were assessed post-intervention, using the FET2 handheld dynamometer. Balance was assessed by means the displacement of centre of pressure during the limits of stability and the ellipse area for postural sway assessment on a Kistler force plate, post-intervention. Medial/lateral displacement of centre of pressure and the mean velocity while descending a self-designed, two-step stair case, were determined after the intervention by measures obtained from a Kistler force plate. Descriptive statistics were calculated for measures of central tendency including means standard deviations. T-scores were used to standardise results obtained. Non-parametric, inferential statistics were used to determine the statistical significance of the results. The Wilcoxon matched pairs test and the Mann-Whitney U tests determined the significance of within group comparisons. Statistical significance was set at p<0.05. Spearman rank order correlations were used to measure the strength of associations Results: Lower extremity isometric strength in musculature around the hip, knee and ankle joints, as well as postural sway in a stationary position with eyes opened, have improved significantly after an eight-week resistance training Programme. Improvements in balance has been indicated by limits of stability in the postural sway stance with eyes closed, and dynamic balance during stair descending, were both not significant. Conclusion: The importance of physical interventions to enable the elderly in living a healthy and independent lifestyle should be promoted in all settings. Muscle strength gains and postural sway improvements could have been attributed to neural adaptation and calls for further investigation into the efficacy of strength training over longer durations. The relevance of incorporating stair negotiation as a functional activity of daily living should potentially be included in exercise Programmeprescription by biokineticists, as insufficient control of dynamic balance has been reported to increase fall risk.
- Full Text:
- Date Issued: 2020
- Authors: Rosenblatt, Desmarie
- Date: 2020
- Subjects: Muscle strength
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/46359 , vital:39595
- Description: Background: The global, exponential growth in the elderly population and increased longevity has been well documented. South Africa has the highest proportion of older population in sub-Saharan Africa. Empirical research is lacking on the efficacy of exercise interventions for the elderly to prevent fall risk and increase independent living associated with quality of life. Maintenance of muscular strength of the lower body is important to compensate for various physiological deficits due to the ageing process. Aim: The aim of the study was to determine the effects of an eight-week lower extremity strength training intervention on balance and postural control in female elderly, aged 65 years and older, living in a high socio-economic, urban, residential area in Nelson Mandela Bay in the Eastern Cape region of South Africa. Design and Methods: A true-experimental, pre-test, post-test study design, was used with a comparative experimental and control group. A total number of 21 participants met the inclusion criteria and were randomly assigned to an experimental or control group. The experimental group participated in an eight-week strength training intervention, attending exercise sessions, twice a week. Peak isometric strength of the knee flexors/extensors, adductors/abductors of the hip, and plantar / dorsi-flexors of the ankle were assessed post-intervention, using the FET2 handheld dynamometer. Balance was assessed by means the displacement of centre of pressure during the limits of stability and the ellipse area for postural sway assessment on a Kistler force plate, post-intervention. Medial/lateral displacement of centre of pressure and the mean velocity while descending a self-designed, two-step stair case, were determined after the intervention by measures obtained from a Kistler force plate. Descriptive statistics were calculated for measures of central tendency including means standard deviations. T-scores were used to standardise results obtained. Non-parametric, inferential statistics were used to determine the statistical significance of the results. The Wilcoxon matched pairs test and the Mann-Whitney U tests determined the significance of within group comparisons. Statistical significance was set at p<0.05. Spearman rank order correlations were used to measure the strength of associations Results: Lower extremity isometric strength in musculature around the hip, knee and ankle joints, as well as postural sway in a stationary position with eyes opened, have improved significantly after an eight-week resistance training Programme. Improvements in balance has been indicated by limits of stability in the postural sway stance with eyes closed, and dynamic balance during stair descending, were both not significant. Conclusion: The importance of physical interventions to enable the elderly in living a healthy and independent lifestyle should be promoted in all settings. Muscle strength gains and postural sway improvements could have been attributed to neural adaptation and calls for further investigation into the efficacy of strength training over longer durations. The relevance of incorporating stair negotiation as a functional activity of daily living should potentially be included in exercise Programmeprescription by biokineticists, as insufficient control of dynamic balance has been reported to increase fall risk.
- Full Text:
- Date Issued: 2020
A comparison of whole body vibration versus conventional training on leg strenght
- Authors: Nieuwoudt, Nadus
- Date: 2008
- Subjects: Leg -- Effect of vibration on , Exercise -- Physiological aspects , Muscle strength
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10093 , http://hdl.handle.net/10948/907 , Leg -- Effect of vibration on , Exercise -- Physiological aspects , Muscle strength
- Description: Whole Body Vibration (WBV) training is a new addition to the field of Exercise and Sports Science and has been developed for the use in strength and conditioning exercises. With the introduction of this new mode of exercise, the study focused on comparing the strength gaining effect of WBV training versus conventional resistance training. The study was conducted in a descriptive, exploratory manner utilizing a quasi-experimental approach with a three group comparison pre-test-post-test design consisting of an experimental-, comparison- and control group. Convenience and snowball sampling were used to select 43 male and female healthy, sedentary volunteer participants. The research focused on reviewing the contribution that each mode of training offers to increase strength in the upper leg and underlines the important physiological adaptations that the human body undergoes to bring about an increase in muscle strength. Both the whole body vibration and land-based resistance groups trained three times a week over an eight week intervention period. Exercises were performed with progressive increments in the frequency, amplitude and duration for the WBV- and in workload, number of sets and repetitions for the conventional resistance training program. The control group remained sedentary throughout the duration of the study. The dependent variables of peak torque flexion and extension of the knee joint in both legs were analyzed using descriptive and inferential statistics. Analysis of covariance (ANCOVA) was done to determine intra-group differences. Post-hoc analysis in the form of Scheffé’s test was done to determine and compare inter-group differences. Practical significance was indicated by means of Partial eta2 The analysis of the results revealed significant strength increases in both conventional resistance training and WBV for most of the dependent variables, except for peak torque extension, where the WBV group did not increase significantly. Based on these results, it can be concluded that both modes of conventional resistance and whole body vibration increased selected dependent variables for upper leg strength in previously inactive individuals.
- Full Text:
- Date Issued: 2008
- Authors: Nieuwoudt, Nadus
- Date: 2008
- Subjects: Leg -- Effect of vibration on , Exercise -- Physiological aspects , Muscle strength
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10093 , http://hdl.handle.net/10948/907 , Leg -- Effect of vibration on , Exercise -- Physiological aspects , Muscle strength
- Description: Whole Body Vibration (WBV) training is a new addition to the field of Exercise and Sports Science and has been developed for the use in strength and conditioning exercises. With the introduction of this new mode of exercise, the study focused on comparing the strength gaining effect of WBV training versus conventional resistance training. The study was conducted in a descriptive, exploratory manner utilizing a quasi-experimental approach with a three group comparison pre-test-post-test design consisting of an experimental-, comparison- and control group. Convenience and snowball sampling were used to select 43 male and female healthy, sedentary volunteer participants. The research focused on reviewing the contribution that each mode of training offers to increase strength in the upper leg and underlines the important physiological adaptations that the human body undergoes to bring about an increase in muscle strength. Both the whole body vibration and land-based resistance groups trained three times a week over an eight week intervention period. Exercises were performed with progressive increments in the frequency, amplitude and duration for the WBV- and in workload, number of sets and repetitions for the conventional resistance training program. The control group remained sedentary throughout the duration of the study. The dependent variables of peak torque flexion and extension of the knee joint in both legs were analyzed using descriptive and inferential statistics. Analysis of covariance (ANCOVA) was done to determine intra-group differences. Post-hoc analysis in the form of Scheffé’s test was done to determine and compare inter-group differences. Practical significance was indicated by means of Partial eta2 The analysis of the results revealed significant strength increases in both conventional resistance training and WBV for most of the dependent variables, except for peak torque extension, where the WBV group did not increase significantly. Based on these results, it can be concluded that both modes of conventional resistance and whole body vibration increased selected dependent variables for upper leg strength in previously inactive individuals.
- Full Text:
- Date Issued: 2008
A comparative normative survey of the isokinetic neck strength of senior elite South African rugby players and schoolboy rugby forwards
- Authors: Olivier, Pierre Emile
- Date: 2003
- Subjects: Rugby football -- South Africa -- Physiological aspects , Neck -- Muscles , Muscle strength , Rugby football players -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:11026 , http://hdl.handle.net/10948/308 , Rugby football -- South Africa -- Physiological aspects , Neck -- Muscles , Muscle strength , Rugby football players -- South Africa
- Description: The aim of this study was to generate useful isokinetic normative data for various cervical musculature strength, range of motion and ratio variables based on different positional categories in a sample of senior elite South African rugby players. Normative data was generated for the following variables: peak torque, power generated at 0.2 of a second, active and passive range of motion, the ratio of peak torque flexion to peak torque extension (PTF/PTE), the ratio of peak torque lateral flexion left to peak torque lateral flexion right (PTL/PTR), the ratios of peak torque to body weight (PT/BW) and the ratios of peak torque to lean body mass (PT/LBM). Furthermore, the data gathered from the senior elite players was compared to similar data obtained from a sample of schoolboy rugby forwards to detect statistically significant differences (p < .05). A normative survey design was used in which 189 subjects from eight provincial unions participated in a one off evaluation session. The evaluation session comprised of various anthropometrical measurements and an isokinetic cervical musculature assessment. The normative data, displayed in Stanine tables, was generated for four positional categories: the front row (# 1-3), the second row (# 4-5), the back row (# 6-8) and the backline (# 9 -15). The second row positional category performed the best on the peak flexion torque variable (44.04 Nm). The front row positional category achieved the largest average peak extension torque (65.6 Nm). The second row positional category achieved the largest average peak lateral flexion right torque (69.42 Nm). A similar result was observed with the measurement of peak lateral flexion left torque, with the second row positional category achieving the largest average peak lateral flexion left torque (66.31 Nm). The backline positional category achieved the lowest averages on all the abovementioned peak torque variables. The front row positional category performed the best on the flexion power generated at 0.2 of a second variable (160.92 W). The front row positional category again achieved the largest extension power generated at 0.2 of a second average (237.02 W). The second row positional category achieved the largest lateral flexion right power generated at 0.2 of a second average (269.81 W). Similar results were observed with the measurement of lateral flexion left power generated at 0.2 of a second. The second row positional category achieved the largest lateral flexion left power generated at 0.2 of a second average (259.62 W). Again the backline players achieved the smallest power generated at 0.2 of a second averages for all the above-mentioned power variables. The measurement of passive (PROMFE) and active (AROMFE) range of motion for flexion to extension revealed that the second row had the largest average PROMFE (125.44°). The measurement of AROMFE revealed a similar result. The second row again had the largest average AROMFE (108.45°). The measurement of passive (PROMLF) and active (PROMFE) range of motion for lateral flexion left to right revealed smaller and different results to those found for PROMFE and AROMFE. For the variable of PROMLF the backline players had the largest average PROMLF (119.44°). Conversely, the second row had the largest average AROMLF (106.96°). The calculation of the various ratios revealed great variation between the positional categories. This can be attributed to the functional requirements the players have to adhere to, to be successful in their position. Various other statistical calculations were performed to draw the average force distance graphs for the positional categories for the peak torque variables. Furthermore the force distance graphs were assessed to determine the players’ ability to maintain 80% of peak torque. All the senior elite positional categories proved to be significantly (p < .05) older and heavier than the schoolboy forwards. The senior elite forward positional categories were also significantly (p < .05) taller than the schoolboy forward. There however proved to be no significant difference (p > .05) in stature between the backline and schoolboy forwards. All the positional categories proved to have significantly thicker (p < .05) necks, but significantly shorter (p < .05) cervical spines than the schoolboy forwards. The forward positional categories demonstrated to be significantly stronger (p < .05), on all peak torque measures, than the schoolboy forwards. The same was observed between the backline and schoolboy forwards, however no statistically significant difference (p > .05) was observed between the respective sample groups for the measure of peak lateral flexion left torque. For all the measures of power generated at 0.2 of a second, the senior forward positional categories proved to be significantly more powerful (p < .05) than the schoolboy forwards. The senior backline, although significantly more powerful (p < .05) in the flexion movement pattern, proved to be significantly less powerful (p < .05) than the schoolboy forwards in the lateral flexion right movement pattern. No statistically significant differences (p < .05) were found to exist between the senior backline and schoolboy forwards for the extension and lateral flexion left power generated at 0.2 of a second variables. All positional categories proved to have significantly smaller (p < .05) active and passive ranges of motion compared to the schoolboy forwards. Conversely, the senior elite players had significantly larger (p < .05) ratios (PTF/PTE, PTL/PTR, PT/BW and PT/LBM) than the schoolboy forwards. Literature has identified schoolboy rugby as having a much higher incidence of cervical spinal injuries than senior rugby. It can thus be inferred from the above information that the variables of peak torque and power generated at 0.2 of a second play a important role in safeguarding a player from injury on the field of play. Furthermore, calculated ratios show that senior players, especially the forwards, have undergone adaptive changes in cervical musculature strength to meet the requirements of the position they play in, thereby safeguarding themselves from cervical spinal injury. Proper cervical musculature conditioning has been cited in the literature as being an effective but neglected method of preventing cervical spinal injuries. The generation of normative data, concerning cervical musculature performance, can thus be used to prevent the occurrence of cervical injuries and re-injury of the cervical spine by providing a standard of musculature strength for safe participation in rugby, and possibly other collision type sports, and a quantified guide for successful patient rehabilitation respectively.
- Full Text:
- Date Issued: 2003
- Authors: Olivier, Pierre Emile
- Date: 2003
- Subjects: Rugby football -- South Africa -- Physiological aspects , Neck -- Muscles , Muscle strength , Rugby football players -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:11026 , http://hdl.handle.net/10948/308 , Rugby football -- South Africa -- Physiological aspects , Neck -- Muscles , Muscle strength , Rugby football players -- South Africa
- Description: The aim of this study was to generate useful isokinetic normative data for various cervical musculature strength, range of motion and ratio variables based on different positional categories in a sample of senior elite South African rugby players. Normative data was generated for the following variables: peak torque, power generated at 0.2 of a second, active and passive range of motion, the ratio of peak torque flexion to peak torque extension (PTF/PTE), the ratio of peak torque lateral flexion left to peak torque lateral flexion right (PTL/PTR), the ratios of peak torque to body weight (PT/BW) and the ratios of peak torque to lean body mass (PT/LBM). Furthermore, the data gathered from the senior elite players was compared to similar data obtained from a sample of schoolboy rugby forwards to detect statistically significant differences (p < .05). A normative survey design was used in which 189 subjects from eight provincial unions participated in a one off evaluation session. The evaluation session comprised of various anthropometrical measurements and an isokinetic cervical musculature assessment. The normative data, displayed in Stanine tables, was generated for four positional categories: the front row (# 1-3), the second row (# 4-5), the back row (# 6-8) and the backline (# 9 -15). The second row positional category performed the best on the peak flexion torque variable (44.04 Nm). The front row positional category achieved the largest average peak extension torque (65.6 Nm). The second row positional category achieved the largest average peak lateral flexion right torque (69.42 Nm). A similar result was observed with the measurement of peak lateral flexion left torque, with the second row positional category achieving the largest average peak lateral flexion left torque (66.31 Nm). The backline positional category achieved the lowest averages on all the abovementioned peak torque variables. The front row positional category performed the best on the flexion power generated at 0.2 of a second variable (160.92 W). The front row positional category again achieved the largest extension power generated at 0.2 of a second average (237.02 W). The second row positional category achieved the largest lateral flexion right power generated at 0.2 of a second average (269.81 W). Similar results were observed with the measurement of lateral flexion left power generated at 0.2 of a second. The second row positional category achieved the largest lateral flexion left power generated at 0.2 of a second average (259.62 W). Again the backline players achieved the smallest power generated at 0.2 of a second averages for all the above-mentioned power variables. The measurement of passive (PROMFE) and active (AROMFE) range of motion for flexion to extension revealed that the second row had the largest average PROMFE (125.44°). The measurement of AROMFE revealed a similar result. The second row again had the largest average AROMFE (108.45°). The measurement of passive (PROMLF) and active (PROMFE) range of motion for lateral flexion left to right revealed smaller and different results to those found for PROMFE and AROMFE. For the variable of PROMLF the backline players had the largest average PROMLF (119.44°). Conversely, the second row had the largest average AROMLF (106.96°). The calculation of the various ratios revealed great variation between the positional categories. This can be attributed to the functional requirements the players have to adhere to, to be successful in their position. Various other statistical calculations were performed to draw the average force distance graphs for the positional categories for the peak torque variables. Furthermore the force distance graphs were assessed to determine the players’ ability to maintain 80% of peak torque. All the senior elite positional categories proved to be significantly (p < .05) older and heavier than the schoolboy forwards. The senior elite forward positional categories were also significantly (p < .05) taller than the schoolboy forward. There however proved to be no significant difference (p > .05) in stature between the backline and schoolboy forwards. All the positional categories proved to have significantly thicker (p < .05) necks, but significantly shorter (p < .05) cervical spines than the schoolboy forwards. The forward positional categories demonstrated to be significantly stronger (p < .05), on all peak torque measures, than the schoolboy forwards. The same was observed between the backline and schoolboy forwards, however no statistically significant difference (p > .05) was observed between the respective sample groups for the measure of peak lateral flexion left torque. For all the measures of power generated at 0.2 of a second, the senior forward positional categories proved to be significantly more powerful (p < .05) than the schoolboy forwards. The senior backline, although significantly more powerful (p < .05) in the flexion movement pattern, proved to be significantly less powerful (p < .05) than the schoolboy forwards in the lateral flexion right movement pattern. No statistically significant differences (p < .05) were found to exist between the senior backline and schoolboy forwards for the extension and lateral flexion left power generated at 0.2 of a second variables. All positional categories proved to have significantly smaller (p < .05) active and passive ranges of motion compared to the schoolboy forwards. Conversely, the senior elite players had significantly larger (p < .05) ratios (PTF/PTE, PTL/PTR, PT/BW and PT/LBM) than the schoolboy forwards. Literature has identified schoolboy rugby as having a much higher incidence of cervical spinal injuries than senior rugby. It can thus be inferred from the above information that the variables of peak torque and power generated at 0.2 of a second play a important role in safeguarding a player from injury on the field of play. Furthermore, calculated ratios show that senior players, especially the forwards, have undergone adaptive changes in cervical musculature strength to meet the requirements of the position they play in, thereby safeguarding themselves from cervical spinal injury. Proper cervical musculature conditioning has been cited in the literature as being an effective but neglected method of preventing cervical spinal injuries. The generation of normative data, concerning cervical musculature performance, can thus be used to prevent the occurrence of cervical injuries and re-injury of the cervical spine by providing a standard of musculature strength for safe participation in rugby, and possibly other collision type sports, and a quantified guide for successful patient rehabilitation respectively.
- Full Text:
- Date Issued: 2003
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