TY - JOUR
T1 - 120 Left Ventricular Longitudinal Strain-Volume Relationships in Elite Athletes
AU - Oxborough, David
AU - Heemels, Annemieke
AU - Forsythe, Lynsey
AU - McClean, Gavin
AU - Mistry, Punit
AU - Lord, Rachel
AU - Utomi, Victor
AU - Jones, Nigel
AU - Thijssen, Dick
AU - Somauroo, John
AU - Sharma, Sanjay
AU - Osborne, Rebecca
AU - Sculthorpe, Nicholas
N1 - Published in BMJ Heart, Vol 102 Suppl 6,
PY - 2016/6/1
Y1 - 2016/6/1
N2 - Introduction
It is well established that left ventricular (LV) adaption occurs in response to chronic physiological conditioning. There is also evidence highlighting functional differences in myocardial strain imaging between athletes from sporting disciplines. This difference may be a consequence of the vague classification of sport i.e. not taking into account relative static and dynamic components and/or merely a consequence of chamber enlargement. We sought to utilise a novel simultaneous assessment of longitudinal strain and LV volume in athletes classified in the 4 corners of Mitchell’s classification of sporting disciplines. The primary aim was to determine relative longitudinal strain throughout the cardiac cycle and its specific contribution to LV volume change in these athletes.
Methods
92 elite male athletes were studied and sub classified based on sporting discipline in accordance with the Mitchell’s classification. (Group IA low static-low dynamic n = 20, Group IC low static-high dynamic n = 25, Group IIIA high static-low dynamic n = 21, Group IIIC high static-high dynamic n = 26). Conventional echocardiography of the LV was undertaken. The raw temporal global longitudinal strain values were exported and divided into 5% time increments across the cardiac cycle. Concomitant LV volumes were traced at each 5% time increment to provide simultaneous strain-volume loops. The strain-volume relationship was assessed by applying a polynomial regression analysis for each systolic and diastolic curve to derive absolute values for% end diastolic volumes (EDV).
Results
Conventional and peak strain indices are presented in table 1. Athletes in group IC and IIIC had larger LV end diastolic volumes (EDV) compared to athletes in groups IA and IIIA (50 ± 6 and 54 ± 8 ml/(m2)1.5 vs. 42 ± 7 and 43 ± 2 ml/(m2)1.5 respectively). Group IIIC also had significantly larger mean wall thickness (MWT) compared to all groups. Peak strain was variable between groups but once normalised for EDV all groups, with exception of IIIC, required similar strain to generate the same% reduction in EDV (see Figures 1 and 2). Conversely group IIIC required greater longitudinal strain for any given% volume which correlated to MWT (r = 0.4, p < 0.0001).
AB - Introduction
It is well established that left ventricular (LV) adaption occurs in response to chronic physiological conditioning. There is also evidence highlighting functional differences in myocardial strain imaging between athletes from sporting disciplines. This difference may be a consequence of the vague classification of sport i.e. not taking into account relative static and dynamic components and/or merely a consequence of chamber enlargement. We sought to utilise a novel simultaneous assessment of longitudinal strain and LV volume in athletes classified in the 4 corners of Mitchell’s classification of sporting disciplines. The primary aim was to determine relative longitudinal strain throughout the cardiac cycle and its specific contribution to LV volume change in these athletes.
Methods
92 elite male athletes were studied and sub classified based on sporting discipline in accordance with the Mitchell’s classification. (Group IA low static-low dynamic n = 20, Group IC low static-high dynamic n = 25, Group IIIA high static-low dynamic n = 21, Group IIIC high static-high dynamic n = 26). Conventional echocardiography of the LV was undertaken. The raw temporal global longitudinal strain values were exported and divided into 5% time increments across the cardiac cycle. Concomitant LV volumes were traced at each 5% time increment to provide simultaneous strain-volume loops. The strain-volume relationship was assessed by applying a polynomial regression analysis for each systolic and diastolic curve to derive absolute values for% end diastolic volumes (EDV).
Results
Conventional and peak strain indices are presented in table 1. Athletes in group IC and IIIC had larger LV end diastolic volumes (EDV) compared to athletes in groups IA and IIIA (50 ± 6 and 54 ± 8 ml/(m2)1.5 vs. 42 ± 7 and 43 ± 2 ml/(m2)1.5 respectively). Group IIIC also had significantly larger mean wall thickness (MWT) compared to all groups. Peak strain was variable between groups but once normalised for EDV all groups, with exception of IIIC, required similar strain to generate the same% reduction in EDV (see Figures 1 and 2). Conversely group IIIC required greater longitudinal strain for any given% volume which correlated to MWT (r = 0.4, p < 0.0001).
U2 - 10.1136/heartjnl-2016-309890.120
DO - 10.1136/heartjnl-2016-309890.120
M3 - Meeting Abstract
SN - 1355-6037
VL - 102
SP - A85-A86
JO - Heart
JF - Heart
IS - Suppl 6
T2 - BCS Annual Conference. ‘Prediction and Prevention’
Y2 - 6 June 2016 through 8 June 2017
ER -