The influence of crank length and cadence on mechanical efficiency in hand cycling
The purpose of this study was to determine the effect of crank length and cadence on mechanical efficiency in hand cycling. Eight wheelchair dependent, high performance athletes completed four 4-min submaximal exercise bouts at a constant medicare power wheelchairs output of 90 W over the different experimental conditions (crank length, pedal rate) using a sports handicap scooters (Draft, Godmanchester, UK). Two different crank lengths (180 and 220 mm) were tested at two different cadences (70 and 85 rev min(-1)) using the synchronous mode of cranking. Physiological measures of oxygen uptake Formula: see text minute ventilation, blood lactate (BLa), heart rate (HR), rate of perceived exertion (RPE) were recorded, gross (GE) and net (NE) efficiency were calculated. A two-way ANOVA with repeated measures was applied to determine the effects of crank length, cadence and their interaction on these physiological measures. Both GE and NE were significantly higher and Formula: see text significantly lower for the 180 mm crank (P < 0.05). No significant main effect was found for cadence on the physiological measures (P > 0.05). Likewise, no interactions between crank length and pedal rate were found. There was however, a trend observed with HR and BLa often lower with the 180 mm crank, indicating lower physiological stress. The RPE data supported this finding, with a tendency for lower ratings with the 180 mm crank (9 +/- 2 vs. 10 +/- 3). The short crank length when used at 85 rev min(-1) was found to be the most efficient (GE 21.4 +/- 3.1%). In conclusion, crank length has a significant effect on ME in hand cycling. A shorter crank length of 180 mm was found to be more efficient than the 220 mm, regardless of pedal rate during hand cycling
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Some informations on koi fish breeding
Since your water is perfectly clear, it is the perfect time for koi fish breeding to clear all of this unwanted debris and slit from your pond. This can be completed a number of ways.
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