The influence of maturation on exercise‐induced cardiac remodelling and haematological adaptation
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Bibliographic record
Abstract
Abstract Cardiovascular and haematological adaptations to endurance training facilitate greater maximal oxygen consumption (), and such adaptations may be augmented following puberty. Therefore, we compared left ventricular (LV) morphology (echocardiography), blood volume, haemoglobin (Hb) mass (CO rebreathing) and in endurance‐trained and untrained boys ( n = 42, age = 9.0–17.1 years, = 61.6 ± 7.2 ml/kg/min, and n = 31, age = 8.0–17.7 years, = 46.5 ± 6.1 ml/kg/min, respectively) and girls ( n = 45, age = 8.2–17.0 years, = 51.4 ± 5.7 ml/kg/min, and n = 36, age = 8.0–17.6 years, = 39.8 ± 5.7 ml/kg/min, respectively). Pubertal stage was estimated via maturity offset, with participants classified as pre‐ or post‐peak height velocity (PHV). Pre‐PHV, only a larger LV end‐diastolic volume/lean body mass (EDV/LBM) for trained boys (+0.28 ml/kg LBM, P = 0.007) and a higher Hb mass/LBM for trained girls (+1.65 g/kg LBM, P = 0.007) were evident compared to untrained controls. Post‐PHV, LV mass/LBM (boys: +0.50 g/kg LBM, P = 0.0003; girls: +0.35 g/kg LBM, P = 0.003), EDV/LBM (boys: +0.35 ml/kg LBM, P < 0.0001; girls: +0.31 ml/kg LBM, P = 0.0004), blood volume/LBM (boys: +12.47 ml/kg LBM, P = 0.004; girls: +13.48 ml/kg LBM, P = 0.0002.) and Hb mass/LBM (boys: +1.29 g/kg LBM, P = 0.015; girls: +1.47 g/kg LBM, P = 0.002) were all greater in trained versus untrained groups. Pre‐PHV, EDV ( R 2 adj = 0.224, P = 0.001) in boys, and Hb mass and interventricular septal thickness ( R 2 adj = 0.317, P = 0.002) in girls partially accounted for the variance in . Post‐PHV, stronger predictive models were evident via the inclusion of LV wall thickness and EDV in boys ( R 2 adj = 0.608, P < 0.0001), and posterior wall thickness and Hb mass in girls ( R 2 adj = 0.490, P < 0.0001). In conclusion, cardiovascular adaptation to exercise training is more pronounced post‐PHV, with evidence for a greater role of central components for oxygen delivery. Key points It has long been hypothesised that cardiovascular adaptation to endurance training is augmented following puberty. We investigated whether differences in cardiac and haematological variables exist, and to what extent, between endurance‐trained versus untrained, pre‐ and post‐peak height velocity (PHV) children, and how these central factors relate to maximal oxygen consumption. Using echocardiography to quantify left ventricular (LV) morphology and carbon monoxide rebreathing to determine blood volume and haemoglobin mass, we identified that training‐related differences in LV morphology are evident in pre‐PHV children, with haematological differences also observed between pre‐PHV girls. However, the breadth and magnitude of cardiovascular remodelling was more pronounced post‐PHV. Cardiac and haematological measures provide significant predictive models for maximal oxygen consumption () in children that are much stronger post‐PHV, suggesting that other important determinants within the oxygen transport chain could account for the majority of variance in before puberty.
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Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it