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The Effect Of Power Output And Cycling Cadence On Lower Extremity EMG Responses In Recreational Cyclists
| Content Provider | Semantic Scholar |
|---|---|
| Author | Martin, Philip E. Sanderson, David J. Umberger, Brian R. |
| Copyright Year | 2001 |
| Abstract | Preferred cycling cadence (85-95 rpm) is substantially higher than the cadence that minimizes energy expenditure (50-60 rpm) (Coast and Welch, 1985; Marsh and Martin, 1993, 1997; Pugh, 1974; Seabury et al., 1977). This difference between preferred and most economical cadences suggests the selection of preferred cadence in cycling is dominated by factors others than energy cost or aerobic demand. The association between preferred cycling cadence and minimization of muscular effort (e.g., global expressions of lower extremity net joint moments, muscular stress, or muscle excitation) has been under investigation by several groups (Hull et al., 1988; MacIntosh et al., 2000; Marsh and Martin, 1995; Marsh et al., 2000; Redfield and Hull, 1986). Marsh and Martin (1995) quantified emg patterns of five lower extremity muscles at a single power output (200 W) over a cadence range of 50-110 rpm. Using a global expression of emg, the relationship between emg and cadence was similar to that observed between aerobic demand and cadence. In other words, the global expression of muscle excitation was lowest at 50 and 65 rpm and, therefore, was not minimized at or near preferred cadence. In an expanded design, MacIntosh et al. (2000) quantified muscle excitation patterns of seven lower extremity muscles during ergometer cycling at power outputs ranging from 100 to 400 W and across a cadence range of 50-120 rpm. Based upon an average emg measure across the seven muscles, MacIntosh et al. concluded lower extremity muscle excitation was affected by cadence for each power output tested. More importantly, the cadence at which average emg was minimized over the tested cadence range increased as power output increased. To better understand the role of lower extremity musculature in generating power output and affecting preferred cadence during cycling, our purpose was to extend our previous assessments of lower extremity emg response to cadence (Marsh and Martin, 1995) and contrast our new observations with recent findings by MacIntosh et al. (2000). |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://isbweb.org/images/conf/2001/Longabstracts/PDF/0900_0999/0966.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
