Respiratory Muscle Fatigue After an Ultra-Marathon Measured as Inspiratory Task Failure

Ker, James; Schultz, C. M.

doi:10.1055/s-2007-972884

Cited by 34 publications

(40 citation statements)

References 3 publications

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“…The aim of the present study was to apply different noninvasive techniques, commonly used in the literature to detect respiratory muscle fatigue [5, 8, 16], for the measurement of possible impairments of respiratory muscle performance after a type of exercise which was previously shown to induce diaphragmatic fatigue [2–4]. Also, the authors wanted to compare measures of reduced performance with the published data on reductions in P di,tw.…”

Section: Discussionmentioning

confidence: 99%

“…FEV1 and mean expiratory flow (MEF) reductions were reported in some of the above mentioned studies [6, 10, 14] while they remained unchanged in others [5, 7, 11, 13, 15]. Finally, K er and S chultz [16] showed that inspiratory muscle endurance time, as measured by sustained inspiratory mouth pressures at a given target pressure and a given duty cycle, was still impaired 3 days after an uotramarathon.…”

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confidence: 99%

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Noninvasive measurement of respiratory muscle performance after exhaustive endurance exercise

Perret¹,

Pfeiffer²,

Boutellier³

et al. 1999

Eur Respir J

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The use of noninvasive techniques to measure respiratory muscle performance after different types of endurance exercise has not been entirely successful, as the results have not consistently indicated diminished performance for similar types of exercise. The aim of the present study was 1) to compare different, noninvasive methods to assess respiratory muscle performance before and after an exhaustive cycling endurance test (which has previously been shown to induce diaphragmatic fatigue) and 2) to determine which of the tests best reflect published results of measurements of diaphragmatic fatigue.Twelve healthy subjects participated in the study and performed three different test series in a random order on three different days. These tests were performed before, and 5, 40 and 75 min after an exhausting task (a cycling endurance run at 85% of maximal oxygen uptake (V 'O 2 ,max)). The tests of the three test series were 1) breathing against a constant inspiratory resistance to task failure, 2) determination of 12-min sustained ventilatory capacity, and 3) spirometric and maximal inspiratory and expiratory mouth pressure measurements.The only measurement that was affected by exhaustive cycling was the time to task failure breathing against inspiratory resistance. It was significantly reduced from (meanSD) 36488 s before exercise to 219122 s at 5 min after cessation of exercise.It is concluded that the constant-load resistive breathing test to task failure is the only noninvasive respiratory muscle performance test evaluated in this study which shows a decrease in respiratory muscle performance after exhaustive endurance exercise.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Noninvasive measurement of respiratory muscle performance after exhaustive endurance exercise

Perret¹,

Pfeiffer²,

Boutellier³

et al. 1999

Eur Respir J

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“…Ambiguous results have been observed after ultramarathons. Ker and Schultz () reported no reduction in either maximal inspiratory or expiratory mouth pressures after an ultramarathon (87 km). Warren et al.…”

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confidence: 99%

Changes in lung function during an extreme mountain ultramarathon

Vernillo

Rinaldo

Giorgi

et al. 2014

Scandinavian Med Sci Sports

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This study aimed to assess the effects of an extreme mountain ultramarathon (MUM, 330 km, 24,000 D+) on lung function. Twenty-nine experienced male ultramarathon runners performed longitudinally [before (pre), during (mid), and immediately after (post) a MUM] a battery of pulmonary function tests. The tests included measurements of forced vital capacity, forced expiratory volume in 1 s, peak flow, inspiratory capacity, and maximum voluntary ventilation in 12 s (MVV12). A significant reduction in the running speed was observed (-43.0% between pre-mid and mid-post; P < 0.001). Expiratory function declined significantly at mid (P < 0.05) and at post (P < 0.05). A similar trend was observed for inspiratory function (P < 0.05). MVV12 declined at mid (P < 0.05) and further decreased at post (P < 0.05). Furthermore, there are significant negative correlations between performance time and MVV12 pre-race (R = -0.54, P = 0.02) as well as changes in MVV12 between pre- and post-race (R = -0.53, P = 0.009). It is concluded that during an extreme MUM, a continuous decline in pulmonary function was observed, likely attributable to the high levels of ventilation required during this MUM in a harsh mountainous environment.

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“…The decrease in respiratory muscle endurance reported after exercise in both groups of the present study is in agreement with findings in the literature. Loke et al (1982) reported a decrease in MVV after completion of a marathon, Ker and Schultz (1996) noted a decrease in t lim 3 days after completion of an ultra-marathon, and Perret at al. (1999) reported a decrease in t lim after a cycle test to exhaustion.…”

Section: Discussionmentioning

confidence: 94%

“…When the negative pressure inside the cylinder exceeded the predetermined pressure load, the inspiratory orifice situated at the bottom of the cylinder would open, allowing inspiratory flow. The spring adjustment of this valve allowed us to impose 75% of the athlete's P Imax at FRC at each inspiration (Ker and Schultz 1996). The P m , which represented this imposed inspiratory load, was constant for a given adjustment of the threshold valve and was nearly flow-independent once the orifice was open (Johnson et al 1996).…”

Section: Respiratory Muscle Endurancementioning

confidence: 99%

The effect of cycling followed by running on respiratory muscle performance in elite and competition triathletes

Boussana¹,

Hue

Matecki

et al. 2002

European Journal of Applied Physiology

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The effect of cycling followed by running on respiratory muscle performance in elite and competition triathletes Abstract This study investigated the possibility of there being differences in respiratory muscle strength and endurance in elite and competition triathletes who have similar maximal oxygen uptakes ( _ V V O 2max ) and ventilatory thresholds (Th vent ). Five internationally-ranked elite, [mean (SD) age 23.8 (1.4) years] and six nationallyand regionally-ranked competition [age 21.1 (1.1) years] male triathletes performed two successive trials: first an incremental cycle test to assess _ V V O 2max and Th vent and second 20 min of cycling followed by 20 min of running (C-R) at intensities higher than 85% _ V V O 2max . Cardioventilatory data were collected every minute during the two trials, using an automated breath-by-breath system. Maximal expiratory and inspiratory (P Imax ) strength were assessed before and 10 min after C-R from the functional residual capacity. Respiratory muscle endurance was assessed 1 day before and 30 min after C-R by measuring the time limit (t lim ). The results showed firstly that during C-R, the competition triathletes had significantly (P<0.05) higher minute ventilation [mean (SEM) 107.4 (3.1) compared to 99. and Th vent , the competition triathletes showed less extensive adaptive mechanisms, including those in the respiratory muscles, than did the elite triathletes. This led to higher ventilation, which appeared to be the cause of the faster development of fatigue in the inspiratory muscles in this group.

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Respiratory Muscle Fatigue After an Ultra-Marathon Measured as Inspiratory Task Failure

Cited by 34 publications

References 3 publications

Noninvasive measurement of respiratory muscle performance after exhaustive endurance exercise

Noninvasive measurement of respiratory muscle performance after exhaustive endurance exercise

Changes in lung function during an extreme mountain ultramarathon

The effect of cycling followed by running on respiratory muscle performance in elite and competition triathletes

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