Measurement of work and power output using friction-loaded cycle ergometers.

Friction-loaded cycle ergometers are widely used to measure the work done in short-duration high-intensity exercise. This work is calculated from the product of the average values of flywheel speed and resistive load. This method assumes the flywheel to be revolving at a constant speed and does not take into account the work required to accelerate it. This study examines the possible error resulting from such an assumption. Ten subjects (five males and five females) each performed a single bout of 30 s maximal exercise on a cycle ergometer, from a rolling start, against a resistive loading of 75 g/kg bodyweight. High frequency logging of the flywheel speed was performed by a microcomputer. Two sets of instantaneous and average values of power and work were calculated by the computer at the conclusion of the exercise. The first used the standard method of calculation and did not take into account the acceleration of the flywheel, whereas the second corrected for it. Statistical comparisons of the two sets ...

[1]  A. Taylor,et al.  The relationship between muscle fiber composition and maximal anaerobic power and capacity. , 1982, The Journal of sports medicine and physical fitness.

[2]  P CERRETELLI,et al.  BALANCE AND KINETICS OF ANAEROBIC ENERGY RELEASE DURING STRENUOUS EXERCISE IN MAN. , 1964, Journal of applied physiology.

[3]  N L Jones,et al.  Effects of pH on maximal power output and fatigue during short-term dynamic exercise. , 1983, Journal of applied physiology: respiratory, environmental and exercise physiology.

[4]  V. Katch,et al.  All-out versus a steady-paced cycling strategy for maximal work output of short duration. , 1976, Research quarterly.

[5]  O. Inbar,et al.  Relationships between Leg Muscle Fiber Type Distribution and Leg Exercise Performance , 1981, International journal of sports medicine.

[6]  Ira Jacobs,et al.  The Effects of Thermal Dehydration on Performance of the Wingate Anaerobic Test , 1980 .

[7]  Per A. Tesch,et al.  Anaerobic Capacity and Muscle Fiber Type Distribution in Man , 1980 .

[8]  A. Fuchs,et al.  The development of spatial‐frequency selectivity in kitten striate cortex. , 1981, The Journal of physiology.

[9]  E. Asmussen,et al.  Body Temperature and Capacity for Work , 1945 .

[10]  W. W. Tuttle,et al.  Effect of altered breakfast habits on physiologic response. , 1949, Journal of applied physiology.

[11]  R Margaria,et al.  Measurement of muscular power (anaerobic) in man. , 1966, Journal of applied physiology.

[12]  M Nadeau,et al.  The bicycle ergometer for muscle power testing. , 1983, Canadian journal of applied sport sciences. Journal canadien des sciences appliquees au sport.

[13]  V L Katch,et al.  Interrelationship between anaerobic power output, anaerobic capacity and aerobic power. , 1979, Ergonomics.

[14]  P A Tesch,et al.  Lactate in human skeletal muscle after 10 and 30 s of supramaximal exercise. , 1983, Journal of applied physiology: respiratory, environmental and exercise physiology.

[15]  V. Katch,et al.  Optimal test characteristics for maximal anaerobic work on the bicycle ergometer. , 1977, Research quarterly.

[16]  A. Hill.  The maximum work and mechanical efficiency of human muscles, and their most economical speed , 1922, The Journal of physiology.

[17]  A Weltman,et al.  Supramaximal training in females: effects on anaerobic power output, anaerobic capacity, and aerobic power. , 1978, The Journal of sports medicine and physical fitness.

[18]  John Y. Harrison,et al.  Maximizing Human Power Output by Suitable Selection of Motion Cycle and Load , 1970 .

[19]  Evans Ja,et al.  Determination of resistance settings for anaerobic power testing. , 1981 .

[20]  V. Katch,et al.  Body weight, leg volume, leg weight and leg density as determiners of short duration work performance on the bicycle ergometer. , 1974, Medicine and science in sports.