Postural control in athletes participating in an ironman triathlon

Nagy, Edit; Tóth, Kálmán; Janositz, Gabor; Kovács, G. L.; Fehér-Kiss, Anna; Ángyán, L; Horváth, Gyöngyi

doi:10.1007/s00421-004-1157-7

Cited by 108 publications

(107 citation statements)

References 39 publications

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“…It has been previously described that exercise at the RCP increases postural instability (Guidetti et al, 2011). However, that study was conducted on a treadmill which can influence visual, vestibular and somatic sensors affecting the postural control (Nagy, Toth, Janositz, Kovacs, Feher-Kiss, & Angyan, 2004). Our study contradicts the data by which reported higher values of LT4 (exercise intensity at which blood lactate concentration reaches a concentration of 4 mmol.L -1 ) and an inverse correlation between the LT4 and ranking position.…”

Section: Discussioncontrasting

confidence: 99%

PPeak oxygen uptake differentiates competitive from recreational male surfboard riders

et al. 2018

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The purpose of this study was to verify if competitive performance status was associated to different levels of specific aerobic fitness in Portuguese surfboard riders. Six recreational surfers (age: 32.3±3.1 years; body mass: 73.2±7.8kg; height: 1.75±0.05m) and six competitive international level surfers (age: 25±8.4years; body mass: 68.5±3.8kg; height: 1.74±0.05m) performed a maximal continuous incremental paddling test consisting of two-minute steps starting at 20W, with increments of 10W, for determination of peak oxygen uptake and maximal aerobic power. Ventilatory threshold and respiratory compensation point with corresponding heart rate and power output were also determined. Elite surfers presented higher values for peak oxygen uptake (43.6±7.9 ml.kg -1.min -1 ) than recreational surfers (31.1±7.4 ml.kg -1 .min -1 , p=0.01) however, there were no differences (p> 0.05) between groups for maximal aerobic power (elite: 76.6±18.6W; recreational: 76.6±16.6W). No significant differences between the power output at which ventilatory threshold or respiratory compensation point occurred but elite surfers reached ventilation threshold with 22.5±5.8 ml.kg -1 .min -1 which was significantly higher than recreational surfers (16±3.7 ml.kg -1 .min -1 ). These findings show that elite surfers have higher values of peak oxygen uptake than recreational surfers which suggest a higher aerobic adaptation that may be related to the different amount of exercise volume undertaken.

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Section: Discussioncontrasting

confidence: 99%

PPeak oxygen uptake differentiates competitive from recreational male surfboard riders

et al. 2018

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“…14,19 A few authors 20,21 have evaluated the fatiguing effects of actual sport performance in triathletes 22 and soccer players. In particular, Zemkova and Hamar 20 and Brito et al 21 analyzed center-of-pressure (COP) velocity of 19-to 21-year-old players (unipedal and bipedal stances with eyes open or closed) before a game, in the break period between the first and second halves, and after a game.…”

Section: Balance and Fatiguementioning

confidence: 99%

Fatigue-Induced Balance Impairment in Young Soccer Players

Pau

Ibba

Attene³

2014

Journal of Athletic Training

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Context: Although balance is generally recognized to be an important feature in ensuring good performance in soccer, its link with functional performance remains mostly unexplored, especially in young athletes.Objective: To investigate changes in balance induced by fatigue for unipedal and bipedal static stances in young soccer players.Design: Crossover study. Setting: Biomechanics laboratory and outdoor soccer field.Patients or Other Participants: Twenty-one male soccer players (age ¼ 14.5 6 0.2 years, height ¼ 164.5 6 5.6 cm, mass ¼ 56.8 6 6.8 kg).Intervention(s): Static balance was assessed with posturalsway analysis in unipedal and bipedal upright stance before and after a fatigue protocol consisting of a repeated sprint ability (RSA) test (2 3 15-m shuttle sprint interspersed with 20 seconds of passive recovery, repeated 6 times).Main Outcome Measure(s): On the basis of the center-ofpressure (COP) time series acquired during the experimental tests, we measured sway area, COP path length, and COP maximum displacement and velocity in the anteroposterior and mediolateral directions. Results:Fatigue increased all sway values in bipedal stance and all values except COP velocity in the mediolateral direction in unipedal stance. Fatigue index (calculated on the basis of RSA performance) was positively correlated with fatigue/rest sway ratio for COP path length and COP velocity in the anteroposterior and mediolateral directions for nondominant single-legged stance.Conclusions: Fatigued players exhibited reduced performance of the postural-control system. Participants with better performance in the RSA test appeared less affected by balance impairment, especially in single-legged stance.Key Words: postural sway, repeated sprint ability test, athletes Key PointsIn young soccer players, balance was adversely affected by fatigue. A moderate correlation existed between balance impairment and repeated sprint ability performance.

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“…Subsequently, a decrease was shown (17) in lower limb-tracking performance immediately after exercising to 50% exhaustion, i.e., short-term metabolic fatigue. However, this type of error can largely be compensated for visually (27,43), and there is indeed a proportionate enhancement of central motor effort during short-term (18) and long-term (6) fatigue. In addition, there is a slower reaction time to auditory stimulus during postexercise balance control (42), suggesting an additional attentional demand during fatigue.…”

mentioning

confidence: 99%

Fatigue and functional performance of human biceps muscle following concentric or eccentric contractions

Smith¹,

Newham²

2007

Journal of Applied Physiology

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Smith ICH, Newham DJ. Fatigue and functional performance of human biceps muscle following concentric or eccentric contractions. J Appl Physiol 102: 207-213, 2007. First published September 21, 2006; doi:10.1152/japplphysiol.00571.2006.-A long-lasting fatigue was measured in human biceps muscle, following 40 maximal isokinetic concentric or eccentric contractions of the forearm, as the response to single-shock stimuli every minute for 4 h. This protocol allowed new observations on the early time course of long-lasting fatigue. Concentric contractions induced a novel progressive decline to 30.2% (SE 7.8, n ϭ 7) of control at 23 min with complete recovery by 120 min. Eccentric contractions lead initially to a smaller force reduction of similar time course followed by a slower decline to 40.0% (SE 5.1, n ϭ 7) control at 120 min with recovery less than half complete at 4 h. A 50-Hz test stimuli overcame both fatigues, identifying low-frequency fatigue. EMG recordings from the biceps muscle showed moderate (Ͻ20%) changes during the fatigue. A visual-tracking task showed no decrement in performance at the time of maximal fatigue of the single-shock response. Because the eccentric contractions have a similar activation, a larger force, but much smaller metabolic usage than concentric contractions, it is concluded that the initial decline is related to the effects of metabolites, whereas the slower phase after eccentric contractions is associated with higher mechanical stress. skeletal muscle; motor control; skill PERIPHERAL MUSCLE FATIGUE can be both short term, with a simultaneous recovery of force and phosphocreatine largely complete within 1 min (36, 37), and long-lasting, remaining for at least 0.5 h after exercise (13). This later failure to develop tension is seen most clearly using low-frequency test stimuli, thus the nomenclature of low-frequency fatigue (19). It remains long after metabolic recovery and is associated with reduced calcium release per action potential (8, 9). In addition, it has long been recognized that high-intensity eccentric contractions give rise to further force reduction that lasts several days and is associated with muscle damage (30,29,35), although the mechanisms for the initial decline in force are still uncertain (2, 31). In this paper, which studies force reduction for up to 4 h after brief but intense fatiguing concentric or eccentric exercise, we refer to the force reduction by either protocol as fatigue. The time scale of the development of long-lasting fatigue remains unclear because it has been experimentally lost either by using a long period of fatiguing exercise or through infrequent test measurements of the degree of fatigue. Normally, the fatigue is shown as having developed by the first measurement point, leading to the assumption that it develops during the fatiguing exercise. However, it was recently found that, in response to short maximal isometric contractions, low-frequency fatigue developed between 3 and 9 min after the exercise (11). Thus, to achieve a faster time...

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Postural control in athletes participating in an ironman triathlon

Cited by 108 publications

References 39 publications

PPeak oxygen uptake differentiates competitive from recreational male surfboard riders

PPeak oxygen uptake differentiates competitive from recreational male surfboard riders

Fatigue-Induced Balance Impairment in Young Soccer Players

Fatigue and functional performance of human biceps muscle following concentric or eccentric contractions

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