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185 The effects of twelve weeks low intensity resistance training on respiratory measures in obese individuals
Monophasic oral contraceptives use does not affect isokinetic torque-position curves in young women
R. Stanton 1*, A. Bryant2, E. Hohmann 1& P. Reaburn 1 1School Of Health And Human Performance, Central Queensland University, Rockhampton, Australia 2School of Physiotherapy, The University of Melbourne, Melbourne, Australia
Hormone fluctuations have been found to produce changes in muscle strength across the menstrual cycle in non-pill users. In contrast, recent evidence shows that young women using monophasic oral contraceptives do not exhibit changes in maximal quadriceps or hamstring strength at different times of the menstrual cycle. However, changes in the torque position curve of young women who use monophasic oral contraceptives have not been previously investigated. Seven subjects taking low dose (30 - 50mcg ethynylestradiol) monophasic oral contraceptives volunteered for this study. lsokinetic torque was assessed at day one (corresponding to,the onset of menstruation), then at weekly intervals throughout one complete menstrual cycle. After a standardised warm up, subjects performed five maximal concentric knee flexion/extension movements at speeds of 60°.s-1 and 240 0 .s-1. Results showed that neither peak knee extension torque nor peak knee flexion torque at 60°.s-1 or 240°.s-1, varied across the menstrual cycle (p>0.05). Isokinetic torque-position curves were compared across testing occasions at 10 degree increments from 80 degrees knee extension to 10 degrees knee extension using custom written LABVIEW software. No significant differences in the torque-position curve were observed across the weeks of the menstrual cycle (p>0.05). Therefore, administration or withdrawal of exogenous hormones maintains the amplitude and temporal characteristics of quadriceps and hamstring isokinetic torque production throughout the menstrual cycle. We conclude that the phase of the menstrual cycle does not need to be taken into account when undertaking isokinetic assessments of young women who use low dose monophasic oral contraceptives.
III :
The effects of twelve weeks low intensity resistance training on respiratory measures in obese individuals. R. Beavers,T. Levinger*, J. Howland, W. Gilleard &A. Binns Southern Cross University
Obesity is associated with impaired respiratory function. As a significant correlation exists between respiratory function, muscle strength and lean body mass, the aim of this study was to examine the effects of low intensity resistance training as an initial intervention, on respiratory function in obese individuals. Both resistance bands and free weights were used to examine the effectiveness of resistance bands as a training mode. Fifteen obese individuals, ten female and five male (mean age 53.9, range 27-75; mean BMI 38.0, range 30.4 to 46.2) volunteered for the study. Participants allocated to resistance band (n= 9) or weights groups (n=6) trained twice a week with intensity monitored by HR and RPE. Measurements include: Forced Vital Capacity (FVC), Forced Expiratory Volume in one second (FEV1) (spirometer) and quadriceps strength (cybex). A repeated measure MANOVA with planned contrasts was used to examine differences within and between groups and Spearman rho was used to assess the relationship between muscle strength and FVC and FEV. No significant differences were found within group or between groups (all variables p>0.05) after training. Correlation was found between quadriceps strength and FVC and FEV1 both before and after training (r between 0.78 and 0.85, p<0.01). Therefore, low intensity resistance training at this frequency is insufficient to induce significant strength changes in this population. The correlation between muscle strength and respiratory function suggests that higher training intensity and/or frequency which will increase strength and lean body mass is needed in order to enhance respiratory changes.
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R. Stanton 1*, A. Bryant2, E. Hohmann 1& P. Reaburn 1 1School Of Health And Human Performance, Central Queensland University, Rockhampton, Australia 2School of Physiotherapy, The University of Melbourne, Melbourne, Australia
Hormone fluctuations have been found to produce changes in muscle strength across the menstrual cycle in non-pill users. In contrast, recent evidence shows that young women using monophasic oral contraceptives do not exhibit changes in maximal quadriceps or hamstring strength at different times of the menstrual cycle. However, changes in the torque position curve of young women who use monophasic oral contraceptives have not been previously investigated. Seven subjects taking low dose (30 - 50mcg ethynylestradiol) monophasic oral contraceptives volunteered for this study. lsokinetic torque was assessed at day one (corresponding to,the onset of menstruation), then at weekly intervals throughout one complete menstrual cycle. After a standardised warm up, subjects performed five maximal concentric knee flexion/extension movements at speeds of 60°.s-1 and 240 0 .s-1. Results showed that neither peak knee extension torque nor peak knee flexion torque at 60°.s-1 or 240°.s-1, varied across the menstrual cycle (p>0.05). Isokinetic torque-position curves were compared across testing occasions at 10 degree increments from 80 degrees knee extension to 10 degrees knee extension using custom written LABVIEW software. No significant differences in the torque-position curve were observed across the weeks of the menstrual cycle (p>0.05). Therefore, administration or withdrawal of exogenous hormones maintains the amplitude and temporal characteristics of quadriceps and hamstring isokinetic torque production throughout the menstrual cycle. We conclude that the phase of the menstrual cycle does not need to be taken into account when undertaking isokinetic assessments of young women who use low dose monophasic oral contraceptives.
III :
The effects of twelve weeks low intensity resistance training on respiratory measures in obese individuals. R. Beavers,T. Levinger*, J. Howland, W. Gilleard &A. Binns Southern Cross University
Obesity is associated with impaired respiratory function. As a significant correlation exists between respiratory function, muscle strength and lean body mass, the aim of this study was to examine the effects of low intensity resistance training as an initial intervention, on respiratory function in obese individuals. Both resistance bands and free weights were used to examine the effectiveness of resistance bands as a training mode. Fifteen obese individuals, ten female and five male (mean age 53.9, range 27-75; mean BMI 38.0, range 30.4 to 46.2) volunteered for the study. Participants allocated to resistance band (n= 9) or weights groups (n=6) trained twice a week with intensity monitored by HR and RPE. Measurements include: Forced Vital Capacity (FVC), Forced Expiratory Volume in one second (FEV1) (spirometer) and quadriceps strength (cybex). A repeated measure MANOVA with planned contrasts was used to examine differences within and between groups and Spearman rho was used to assess the relationship between muscle strength and FVC and FEV. No significant differences were found within group or between groups (all variables p>0.05) after training. Correlation was found between quadriceps strength and FVC and FEV1 both before and after training (r between 0.78 and 0.85, p<0.01). Therefore, low intensity resistance training at this frequency is insufficient to induce significant strength changes in this population. The correlation between muscle strength and respiratory function suggests that higher training intensity and/or frequency which will increase strength and lean body mass is needed in order to enhance respiratory changes.
110