Influence of inspiratory resistance on performance during graded exercise tests on a cycle ergometer.

@article{Heus2004InfluenceOI,
  title={Influence of inspiratory resistance on performance during graded exercise tests on a cycle ergometer.},
  author={Ronald Heus and Emiel A den Hartog and L. A. Kistemaker and Walter J van Dijk and Gerard Swenker},
  journal={Applied ergonomics},
  year={2004},
  volume={35 6},
  pages={
          583-90
        }
}
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References

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Twenty subjects wearing protective respirators were studied during submaximal exercise on a treadmill and the difficulty in inspiration correlated significantly to inspiratory resistance and seems to be the main reason for cessation of the effort.
Physiological effects of inspiratory resistance on progressive aerobic work
TLDR
Breathing with the new CB respirator and each of the three purifying canisters had no detrimental effect on progressive aerobic work to exhaustion, however, prolonged work at intensities greater than 80–85% would in all probability be impaired when breathing with the CB mask and the canisters.
Combined effects of breathing resistance and hyperoxia on aerobic work tolerance.
TLDR
Aerobic work tolerance reduced with high inspiratory resistance was partly restored by moderate hyperoxia, apparently because the ventilatory limit was delayed, and ventilation and work tolerance were limited by R3 before the legs fatigued.
Inspiratory muscle training improves rowing performance.
TLDR
IMT improves rowing performance on the 6-min all-out effort and the 5000-m trial and improves the resistance of the training group to inspiratory muscle fatigue after the 7-minute all- out effort.
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TLDR
The presence of significant external resistance to breathing was found to influence the traditional relationship between exercise intensity and duration and the true physiological limit was found.
Addition of inspiratory resistance increases the amplitude of the slow component of O2 uptake kinetics.
TLDR
Taken together, this increase and the lack of any differences in minute volume and ventilatory parameters between the two experimental conditions suggest the occurrence of a Vo(2) slow component specific to the respiratory muscles in loaded condition.
Acceptable levels for breathing resistance of respiratory apparatus.
TLDR
It is concluded that excessive pressure exerted during inspiration is a major factor in determining subjective tolerance and an acceptable limit for inspiratory resistance is presented, which considers the additional respiratory work load in terms of unit ventilation.
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TLDR
This maximal inspiratory mouth pressure is proposed as a safety limit for prolonged work using a respirator, with a recommended energy expenditure close to 40% of maximal oxygen uptake.
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TLDR
During submaximal exercise, normal subjects did not reach their compensation limits for the variables studied and tended to limit peak work rate and to prolong the inspiratory portion of the respiratory cycle due to respirator use.
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TLDR
Although maxillary mouthguards do increase R(O) when jaw position is controlled, individual subjects respond differently when in control of mouth opening, related to variable recruitment of compensatory mechanisms (e.g. mouth opening and/or oral airway dilator muscle activity).
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