Abstract:
:This study systematically examined the role of work rate (WR) increment on the kinetics of pulmonary oxygen uptake (VO(2p)) and near-infrared spectroscopy (NIRS)-derived muscle deoxygenation (Δ[HHb]) during moderate-intensity (Mod) cycling. Fourteen males (24 ± 5 years) each completed four to eight repetitions of Mod transitions from 20 to 50, 70, 90, 110 and 130 W. VO(2p) and Δ[HHb] responses were modelled as a mono-exponential; responses were then scaled to a relative % of the respective response (0-100 %). The Δ[HHb]/VO(2) ratio was calculated as the average Δ[HHb]/VO(2) during the 20-120 s period of the on-transient. When considered as a single group, neither the phase II VO(2p) time constant (τVO(2p); 27 ± 9, 26 ± 11, 25 ± 10, 27 ± 14, 29 ± 13 s for 50-130 W transitions, respectively) nor the Δ[HHb]/VO(2) ratio (1.04 ± 0.13, 1.10 ± 0.13, 1.08 ± 0.07, 1.09 ± 0.11, 1.09 ± 0.09, respectively) was affected by WR (p > 0.05); yet, the VO(2) functional gain (G; ΔVO(2)/ΔWR) increased with increasing WR transitions (8.6 ± 1.3, 9.1 ± 1.2, 9.5 ± 1.0, 9.5 ± 1.0, 9.9 ± 1.0 mL min(-1) W(-1); p < 0.05). When subjects were stratified into two groups [Fast (n = 6), τVO(2p130W) < 25 s < τVO(2p130W), Slower (n = 8)], a group by WR interaction was observed for τVO(2p). The increasing functional G persisted (p < 0.05) and did not differ between groups (p > 0.05). The Δ[HHb]/VO(2) ratio was smaller (p < 0.05) in the Fast than Slower group, but was unaffected by WR. In conclusion, the present study demonstrated (1) a non-uniform effect of Mod WR increment on τVO(2p); (2) that τVO(2p) in the Slower group is likely determined by an O(2) delivery limitation; and (3) that increasing Mod WR increments elicits an increased functional G, regardless of the τVO(2p) response.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Spencer MD,Murias JM,Kowalchuk JM,Paterson DHdoi
10.1007/s00421-012-2460-3subject
Has Abstractpub_date
2013-03-01 00:00:00pages
545-57issue
3eissn
1439-6319issn
1439-6327journal_volume
113pub_type
杂志文章abstract:PURPOSE:Prolonged static stretching (SS) in isolation (no dynamic warm-up) can impair muscle performance. There are conflicting reports whether impairments are present in antagonist and contralateral muscles. The objective of this study was to assess the effect of unilateral hamstrings SS on ipsilateral stretched and c...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-019-04182-x
更新日期:2019-09-01 00:00:00
abstract::We compared the cardiorespiratory response and muscle recruitment [as determined by electromyography (EMG)] of 37 McArdle patients [19 males, 37.4 ± 2.8 years, body mass index (BMI): 25.1 ± 4.7 kg m(-2)] and 33 healthy controls (18 males, 36.4 ± 10.0 years, BMI: 25.7 ± 3.8 kg m(-2)) during cycle-ergometer exercise (an...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-010-1585-5
更新日期:2010-11-01 00:00:00
abstract:PURPOSE:The purpose of this research is to determine the pacing and nutrition strategies which minimize completion time and carbohydrate intake for athletes competing in ultramarathon races. METHODS:We present the formulation of a two-phase optimization model. The first-phase mixed-integer nonlinear program (MINLP) de...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-017-3741-7
更新日期:2017-12-01 00:00:00
abstract::In order to quantify the seasonal variability of haemoglobin mass (Hb(mass)) in cyclists during a competitive season, and investigate whether variability is associated with changes in training load or performance, Hb(mass) was measured in 10 internationally competitive female road cyclists approximately once per month...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-009-1349-2
更新日期:2010-05-01 00:00:00
abstract:PURPOSE:Topical application of nonivamide-nicoboxil cream to resting legs has been shown to enhance the level of oxygenated haemoglobin in leg muscles 15 min later. Here, we examined whether such application improves the performance of experienced cyclists in a subsequent 4-km time-trial. METHODS:Nine male cyclists [2...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-016-3357-3
更新日期:2016-05-01 00:00:00
abstract:PURPOSE:Endurance exercise competitions have shown a transient negative effect on global right ventricular (RV) performance. Most published studies are based on terrestrial sports. The aim of our study was to evaluate the cardiac effects after an open water swimming race. METHODS:We evaluated 33 healthy swimmers (mean...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-019-04085-x
更新日期:2019-04-01 00:00:00
abstract::This study assessed the relationship between rating of perceived exertion (RPE) and time to exhaustion during arm cranking exercise while exercising at two different constant-load exercise intensities in able-bodied and paraplegic individuals. The second aim of this study was to assess the rate of change in the RPE be...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-010-1722-1
更新日期:2011-06-01 00:00:00
abstract::Beta-hydroxy-beta-methylbutyrate (HMB) is a metabolite derived from leucine. The anti-catabolic effect of HMB is well documented but its effect upon skeletal muscle strength and fatigue is still uncertain. In the present study, male Wistar rats were supplemented with HMB (320 mg/kg per day) for 4 weeks. Placebo group ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-011-2224-5
更新日期:2012-07-01 00:00:00
abstract:PURPOSE:Many physiological maladaptations persist after overreaching and overtraining resistance exercise (RE). However, no studies have investigated changes in mitogen-activated protein kinases (MAPK) after overtraining in humans, despite their critical role regulating exercise-induced muscular adaptations. The purpos...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-016-3492-x
更新日期:2016-12-01 00:00:00
abstract::Decompression sickness is initiated by gas bubbles formed during decompression, and it has been generally accepted that exercise before decompression causes increased bubble formation. There are indications that exercise-induced muscle injury seems to be involved. Trauma-induced skeletal muscle injury and vigorous exe...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-012-2537-z
更新日期:2013-05-01 00:00:00
abstract::This study compared the rate of fatigue and lower limb EMG activities during high-intensity constant-load cycling in upright and supine postures. Eleven active males performed seven cycling exercise tests: one upright graded test, four fatigue tests (two upright, two supine) and two EMG tests (one upright, one supine)...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-009-1254-8
更新日期:2010-03-01 00:00:00
abstract::Branched chain amino acids (BCAA), particularly leucine, have been suggested to be ergogenic for both endurance and strength/power performance. This study investigated the effects of dietary leucine supplementation on the exercise performance of outrigger canoeists. Thirteen (ten female, three male) competitive outrig...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-005-0036-1
更新日期:2006-08-01 00:00:00
abstract:PURPOSE:The aim of this study was to compare the muscle oxygenation between trained and untrained subjects during heavy exercise until exhaustion at two extreme pedaling cadences using a NIRS system. METHODS:Nine untrained male subjects and nine male competitive triathletes cycled until exhaustion at an intensity corr...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-015-3235-4
更新日期:2015-12-01 00:00:00
abstract::The purpose of this study was to assess cardiac function and arteriovenous oxygen difference (a-vO(2) difference) at rest and during exercise in young, normal-weight (n = 20), and obese (n = 12) men and women who were matched for age and fitness level. Participants were assessed for body composition, peak oxygen consu...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-010-1554-z
更新日期:2011-06-01 00:00:00
abstract::We tested the validity of an new methodological approach to the calculation of oxygen uptake efficiency slope (OUES) [i.e. the use of exercise end-points based on fractions of heart rate reserve (HR(res))], as an alternative to the traditional time-based calculation. Twenty-nine healthy sedentaries >60 years of age (1...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-007-0545-1
更新日期:2007-12-01 00:00:00
abstract::The purposes of this study were firstly to compare and investigate localised fatigue in the upper trapezius muscle in various arm positions as assessed by mechanomyographic (MMG) and surface electromyographic (EMG) signals and secondly to study the effects of different normalisation methods on MMG and EMG signals duri...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-002-0655-8
更新日期:2002-08-01 00:00:00
abstract::Coordination of the respiratory rhythm with the rhythm of limb movements has often been observed during rhythmical exercise (e.g. in locomotion). It is usually associated with changes in the respiratory time course, but not in the locomotor rhythm. Therefore, we hypothesised that in walking, the extent of coordination...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210000224
更新日期:2000-07-01 00:00:00
abstract::The aim of this study was to investigate the role of trunk incline (TI) and projected frontal area (A(eff)) in determining drag during active/passive measurements. Active drag (D(a)) was measured in competitive swimmers at speeds from 0.6 to 1.4 m s(-1); speed specific drag (D(a)/v(2)) was found to decrease as a funct...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-009-1007-8
更新日期:2009-05-01 00:00:00
abstract:PURPOSE:To investigate (1) whether maximal stroke volume (SVmax) occurs at submaximal exercise intensities, (2) sex differences in SVmax once fat-free mass (FFM) has been controlled for, and, (3) the contribution of concurrent changes in FFM and SVmax to the sex-specific development of peak oxygen uptake [Formula: see ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-019-04241-3
更新日期:2019-12-01 00:00:00
abstract::The purpose of this study was to determine the impact of high-intensity intermittent exercise on the presence of circulating growth hormone (GH) aggregates measured using two different assay techniques. Six male subjects with endurance training background participated in this study under both exercise and no-exercise ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-002-0774-2
更新日期:2003-04-01 00:00:00
abstract:PURPOSE:To compare the increases in upper- and lower-body muscle strength in premenopausal women performing resistance training (RT) alone or alongside concurrent high-intensity interval training (CT). METHODS:Sixteen women (26-40 years) were randomly assigned into two groups that performed either RT or CT. Both group...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-017-3614-0
更新日期:2017-06-01 00:00:00
abstract:PURPOSE:Under electrically evoked contractions, the time interval between the onset of the stimulation pulse (Stim) and the beginning of force (F) development can be partitioned (Delay(TOT)), by an electromyographic (EMG), mechanomyographic (MMG) and F combined approach, into three components each containing different ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-013-2790-9
更新日期:2014-03-01 00:00:00
abstract::To compare the effect of hyperthermia on maximal oxygen uptake (VO2max) in men and women, VO2max was measured in 11 male and 11 female runners under seven conditions involving various ambient temperatures (Ta at 50% RH) and preheating designed to manipulate the esophageal (Tes) and mean skin (Tsk) temperatures at VO2m...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-004-1053-1
更新日期:2004-08-01 00:00:00
abstract::Twenty healthy women aged between 65 and 74 years, trained three times a week, for 16 weeks, on a cycle ergometer, to determine the effects of dynamic resistance training on heart rate variability (HRV). Subjects were allocated to two training groups, high (HI, n=10) and low (LO, n=10) intensity. The HI group performe...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-002-0775-1
更新日期:2003-03-01 00:00:00
abstract::The present study examined the effect of hyperbaric oxygen (HBO) on the formation of 2,3-dihydroxybenzoic acid (2,3-DHBA) and 2,5-dihydroxybenzoic acid (2,5-DHBA), the products of salicylate trapping of hydroxyl free radicals, and glutamate release in the striatum during acute ischemia and reperfusion. Non-HBO rats (n...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-009-1229-9
更新日期:2010-02-01 00:00:00
abstract:PURPOSE:Walking is a complex locomotor process that involves both spinal cord reflexes and cortical integration of peripheral nerve input. Maintaining an upright body position requires not only neuromuscular activity but also cardiovascular regulation. We postulated that plantar mechanical stimulation might modulate au...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-016-3479-7
更新日期:2016-12-01 00:00:00
abstract::Measuring physical workload in occupational medicine is fundamental for risk prevention. An indirect measurement of total and relative energy expenditure (EE) from heart rate (HR) is widely used but it has never been validated. The aim of this study was to validate this HR-estimated energy expenditure (HREEE) method a...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-004-1228-9
更新日期:2005-05-01 00:00:00
abstract::Physical inactivity in response to a spinal cord injury (SCI) represents a potent stimulus for conduit artery remodelling. Changes in conduit artery characteristics may be induced by the local effects of denervation (and consequent extreme inactivity below the level of the lesion), and also by systemic adaptations due...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-012-2400-2
更新日期:2012-12-01 00:00:00
abstract::The purpose of this study was to investigate the effects of unilateral muscle fatigue induced on the hip flexors/extensors or the ankle plantar/dorsiflexors on unipedal postural stability under different visual conditions. Twenty-four healthy young women completed 2 testing sessions 1 week apart with a randomized orde...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-012-2330-z
更新日期:2012-10-01 00:00:00
abstract::The influence of fatigue on the stretch reflex evoked in ankle extensor muscles by hopping was investigated in six healthy men. The men hopped on a force platform, at spontaneous frequency and amplitude, until they were unable to maintain the initial frequency or amplitude of the jumps. This task was done with the kne...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210000324
更新日期:2001-01-01 00:00:00