An electromyographic analysis of selected abdominal exercises.
Abdominal exercises are commonly prescribed for abdominal musculature training and strengthening. This study determined the EMG activity of four selected abdominal exercises on the cumulative abdominal musculature and the influence of the rectus femoris. Twenty-four male subjects volunteered for thi...
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| Main Author: | |
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| Format: | Thesis Electronic eBook |
| Language: | English |
| Published: |
1997
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| Subjects: | |
| Online Access: | Static URL is not available. In OregonPDF, search for the Author using the All tab. Static URL is not available. In OregonPDF, search for the Author using the All tab |
| Summary: | Abdominal exercises are commonly prescribed for abdominal musculature training and strengthening. This study determined the EMG activity of four selected abdominal exercises on the cumulative abdominal musculature and the influence of the rectus femoris. Twenty-four male subjects volunteered for this study. Subjects performed four abdominal exercises (sit-up, Abflex(TM), AbRoller Plus(TM), and crunch). Time and amplitude normalized EMG activity were recorded from the upper rectus abdominis, lower rectus abdominis, external oblique, and rectus femoris muscles. A single factor ANOVA with 4 levels was performed on cumulative abdominal muscles to identify differences in exercises (sit-up, Abflex, AbRoller Plus, crunch). A significant difference between exercises F (3, 69)=9.89, p<.05 was observed. The crunch (746.8% IC 1 RM/ms) and the Abflex (745.6% IC 1 RM/ms) elicited significantly greater EMG activity than the sit-up (639.9% IC 1 RM/ms) and the AbRoller Plus (618.0% IC 1 RM/ms). The crunch was not significantly different from the Abflex; and the sit up was not significantly different from the AbRoller Plus. Personal preference to one abdominal exercise and/or sport specific training will dictate which exercise should be used. Stewart, Ian Braidwood. Can altered body position alleviate post-exercise pulmonary diffusing capacity impairment?, 1997. M.S., University of British Columbia (Ken Coutts). (70pp 1f $6.00) PH 1594. Abstract: Pulmonary diffusing capacity for carbon monoxide (Dlco), alveolar-capillary membrane diffusing capacity (Dm), and pulmonary capillary blood volume (Vc) are all significantly reduced following exercise. It is unknown if measurement position affects this impaired gas transfer post exercise. Prior to (baseline) and 15 minutes, 1, 2, and 4 hours following an incremental cycle to fatigue Dlco, Dm, and Vc were recorded in 10 healthy male subjects in both a supine and upright seated position. It was expected that the supine post-exercise measurement position would significantly reduce the decrement in Vc and thus Dlco, by facilitating a return of blood to the thoracic cavity. With removal of the 15 minute data, due to the lack of achievement of a resting cardiovascular state (heart rate, systolic and diastolic blood pressure all significantly different from baseline), a significant reduction in Dlco, Dm, and Vc was observed 1, 2, and 4 hours post exercise. (Table 1. Dlco, Dm, Vc means values for supine and seated combined corrected for alveolar volume. There was a significant difference between positions for Dlco (4.66+/-0.98 vs. 5.22+/-0.89, seated vs. supine, p=0.022) and Dm (6.28+/-1.36 vs. 7.00+/-1.32, seated vs. supine, p=0.016), but there was no position effect for Vc. Nor was there any significant interaction between the positions over time for Dlco, Dm, or Vc. The change in Dlco appears to be primarily due to a decrease in Vc. The limited decrease in Dm in the supine position was likely due to a redistribution of blood within the lung, due to gravity, enhancing the surface area available for diffusion. Although the mechanism for the reduction in Vc cannot be determined from this data, a passive relocation of blood into the periphery due to gravity can be discounted, indicating that active vasoconstriction of the pulmonary vasculature and/or peripheral vasodilatation maybe occurring post-exercise. This is the first data to indicate that the maintained diffusion impairment is independent of measurement position. |
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| Item Description: | [Advisor:] Mark D. Richard. |
| Physical Description: | 131 pgs. : 2 microfiche |
