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Exercise and Muscle Performance01:27

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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Metabolic consequences of resistive force selection during cycle ergometry exercise.

Julien S Baker1, Michael R Graham, Bruce Davies

  • 1Health and Exercise Science Research Laboratory, School of Applied Science, University of Glamorgan, Pontypridd, Wales. jsbaker@glam.ac.uk

Research in Sports Medicine (Print)
|March 17, 2007
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Using fat-free mass (FFM) for cycle ergometry resistance may enhance peak power output and reduce blood lactate accumulation compared to using total-body mass (TBM). This suggests FFM better reflects high-intensity exercise capacity.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Assessing high-intensity exercise performance requires accurate protocols.
  • Previous methods using total-body mass (TBM) may not optimally differentiate physiological responses.

Purpose of the Study:

  • To compare power outputs and blood lactate concentrations ([La-]B) during maximal cycle ergometry.
  • To investigate the impact of resistive forces derived from total-body mass (TBM) versus fat-free mass (FFM).

Main Methods:

  • 30-second maximal cycle ergometry tests were performed.
  • Resistive forces were calculated based on either TBM or FFM.
  • Peak power output (PPO), pedal velocity (PV), resistive forces (RF), and blood lactate ([La-]B) were measured.

Main Results:

  • Significant differences were observed in PPO, PV, and RF between TBM and FFM protocols.
  • Blood lactate ([La-]B) increased post-exercise for both protocols, but was significantly higher with TBM.
  • FFM protocol yielded higher PPO (1020 W) compared to TBM (953 W).

Conclusions:

  • The fat-free mass (FFM) protocol may optimize the assessment of high-intensity exercise performance.
  • FFM may promote greater utilization of the adenosinotriphosphate-phosphocreatine (ATP-PC) energy system.
  • This approach could lead to a more accurate evaluation of exercise capacity compared to TBM.