Durability of the moderate-to-heavy intensity transition can be predicted using readily available markers of physiological decoupling DOI Creative Commons
Jeffrey A. Rothschild, Gabriele Gallo,

Kate Hamilton

и другие.

European Journal of Applied Physiology, Год журнала: 2025, Номер unknown

Опубликована: Май 22, 2025

Abstract Purpose To assess relationships between heart rate (HR), ventilation (̇ $$\dot V$$ V ˙ E ), and respiratory frequency (F R ) decoupling durability of the first ventilatory threshold (VT 1 strength practical models to predict power output at VT during prolonged exercise. Methods Durability was assessed via measurements before after ~ 2.5-h initially moderate-intensity cycling in 51 trained cyclists, as part four studies published elsewhere. In 12 those participants, every hour until task failure. For assessment , HR, F ̇ measured fixed outputs, thus these variables with determined. Bivariate repeated-measures correlations (r rm were assessed. Multivariable created exercise using generalised estimating equations. Results Negative observed exercise-induced change HR = −0.76, P < 0.001) −0.40, 0.013) decoupling, but not −0.25, 0.136). The final prediction model, containing baseline peak oxygen uptake, an interaction duration, effectively predicted real-time (mean absolute error, 7.2 W; 2 0.95). Conclusion and/or controlled training sessions may be a practically useful assessment. Our effective means improving within-session intensity regulation load monitoring.

Язык: Английский

Correlation properties and respiratory frequency of ECG‐derived heart rate variability during multiple race‐pace running intervals in female and male long‐distance runners DOI Creative Commons
Thomas Gronwald, Marcelle Schaffarczyk, Dominik Fohrmann

и другие.

Physiological Reports, Год журнала: 2025, Номер 13(3)

Опубликована: Фев. 1, 2025

Abstract Aim was to evaluate alterations of the non‐linear short‐term scaling exponent alpha1 detrended fluctuation analysis (DFAa1) heart rate (HR) variability (HRV) as a sensitive marker for assessing global physiological demands during multiple running intervals. As secondary analysis, agreement ECG‐derived respiratory frequency (EDR) compared (RF) derived from metabolic cart evaluated with same chest belt device. Fifteen trained female and male long‐distance runners completed four bouts over 5 min on treadmill at marathon pace. During last 3 each bout gas exchange data single‐channel ECG determination HR, DFAa1 HRV, EDR RF were analyzed. Additionally, blood lactate concentration (BLC) determined rating perceived exertion (RPE) requested. DFAa1, oxygen consumption, BLC, RPE showed stable behaviors comparing Only HR ( p < 0.001, d = 0.17) 0.012, 0.20) indicated slight increases small effect sizes. In addition, results point towards inter‐individual differences in all internal load metrics. The comparison revealed high correlations r 0.80, ICC 3,1 0.87) low mean (1.8 ± 4.4 breaths/min), but rather large limits 10.4 −6.8 breaths/min. Results show necessity methodology improvement before being used wide range individuals sports applications. Relationship other metrics, including RF, quasi‐steady‐state conditions bears potential further evaluation exercise prescription may enlighten decoupling mechanisms prolonged bouts.

Язык: Английский

Процитировано

0
The accuracy of fixed intensity anchors to estimate lactate thresholds in recreational runners DOI Creative Commons
Olli‐Pekka Nuuttila, Piia Kaikkonen, Harri Sievänen

и другие.

European Journal of Applied Physiology, Год журнала: 2025, Номер unknown

Опубликована: Март 15, 2025

Abstract Background Endurance exercise intensities can be categorized into moderate, heavy, and severe domains based on physiological responses during incremental testing. Since the evaluation of metabolic thresholds is not always possible, this study assessed accuracy fixed intensity anchors to estimate lactate thresholds. Methods 165 (64 females, 101 males) recreational runners performed a maximal treadmill test. The first (LT1) second (LT2) were determined as percentages maximum heart rate (HR), oxygen consumption (VO 2 ), running speed, alongside rating perceived exertion (RPE). Sex-specific mean values used determine threshold analyze error magnitude for each method. Results Females had higher relative HR, VO , speed at LT1 compared males ( p < 0.001). In pooled data, absolute estimating varied from 0.6 0.8 km/h 4.9–7.4 bpm while LT2 errors ranged 0.4 2.8–5.2 bpm, respectively. speed-derived estimations yielded smallest magnitudes, RPE-derived least accurate. Estimating increased respective 1.0 8.4 LT1, 1.1 6.7 LT2. Conclusion occurred in suggesting need sex-specific anchors. estimates most accurate, but estimation impaired prediction accuracy. Thus, optimal method also depends availability values.

Язык: Английский

Процитировано

0
Durability as an index of endurance exercise performance: Methodological considerations DOI Creative Commons
Ben Hunter, Ed Maunder, Andrew M. Jones

и другие.

Experimental Physiology, Год журнала: 2025, Номер unknown

Опубликована: Март 27, 2025

Endurance athletes routinely complete physiological assessments to predict performance, inform training programmes and monitor subsequent adaptations. This profiling is typically performed with the athlete in a 'fresh' (i.e., rested) condition, but variables deteriorate during prolonged exercise. Durability has been defined as resilience deterioration of performance or following Herein, we review current approaches measure durability. The construction fatiguing protocol affects durability profiles, greater relative intensity duration resulting more marked baseline measures. design should control for factors that could impact measurements, such nutrition environmental characteristics, ensure outcomes are repeatable can be compared between over time same athlete. selection these parameters based on proposed research question applied context take account status Accordingly, this highlights important considerations protocols practice appropriate.

Язык: Английский

Процитировано

0
Do heart rates of elite marathon runners exhibit room for drift? Implications for durability DOI Creative Commons
Fuminori Takayama, Atsushi Aoyagi

Frontiers in Sports and Active Living, Год журнала: 2025, Номер 7

Опубликована: Апрель 14, 2025

Язык: Английский

Процитировано

0
Prolonged running reduces speed at the moderate-to-heavy intensity transition without additional reductions due to increased eccentric load DOI Creative Commons

Annabel Barrett,

Ed Maunder

European Journal of Applied Physiology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 29, 2025

Abstract Aim To investigate the impact of prolonged running on speed at moderate-to-heavy intensity transition, and whether increased eccentric load modifies exercise-induced shifts in transition. Methods Twelve endurance-trained runners (4 females, 8 males, peak oxygen uptake 51.5 mL kg −1 min females 56.1 males) participated. Following trials to assess first ventilatory threshold (VT 1 ) a 0% gradient -10% gradient, participants completed two trials: (i) level trial (LVL): 120-min (ii) downhill (DH): with 90-min 6 × 5-min intervals (DH). Running was conducted 90% VT for respective gradients. Speed perceived leg muscle soreness, maximal voluntary isometric knee extensor torque were assessed pre- post-prolonged exercise. Results An effect time observed (∆-6.2 ± 3.6% LVL ∆-7.6 3.2% DH, P < 0.001), no condition (LVL vs. = 0.382), or interaction ( 0.295). Reduced metabolic energy expenditure (metabolic power) significantly contributed reduced both whereas changes economy (energetic efficiency) did not 0.228). Conclusion Prolonged moderate-intensity but this exacerbated by load. transition following primarily attributed decreased power.

Язык: Английский

Процитировано

0
Durability of the moderate-to-heavy intensity transition can be predicted using readily available markers of physiological decoupling DOI Creative Commons
Jeffrey A. Rothschild, Gabriele Gallo,

Kate Hamilton

и другие.

European Journal of Applied Physiology, Год журнала: 2025, Номер unknown

Опубликована: Май 22, 2025

Abstract Purpose To assess relationships between heart rate (HR), ventilation (̇ $$\dot V$$ V ˙ E ), and respiratory frequency (F R ) decoupling durability of the first ventilatory threshold (VT 1 strength practical models to predict power output at VT during prolonged exercise. Methods Durability was assessed via measurements before after ~ 2.5-h initially moderate-intensity cycling in 51 trained cyclists, as part four studies published elsewhere. In 12 those participants, every hour until task failure. For assessment , HR, F ̇ measured fixed outputs, thus these variables with determined. Bivariate repeated-measures correlations (r rm were assessed. Multivariable created exercise using generalised estimating equations. Results Negative observed exercise-induced change HR = −0.76, P < 0.001) −0.40, 0.013) decoupling, but not −0.25, 0.136). The final prediction model, containing baseline peak oxygen uptake, an interaction duration, effectively predicted real-time (mean absolute error, 7.2 W; 2 0.95). Conclusion and/or controlled training sessions may be a practically useful assessment. Our effective means improving within-session intensity regulation load monitoring.

Язык: Английский

Процитировано

0