TY - JOUR
T1 - Rowers with a recent history of low back pain engage different regions of the lumbar erector spinae during rowing
AU - Martinez Valdes, Eduardo
AU - Wilson , Fiona
AU - Fleming, Neil
AU - McDonnell, Sarah-Jane
AU - Horgan , Alex
AU - Falla, Deborah
PY - 2019/11
Y1 - 2019/11
N2 - Objectives: Despite the high prevalence of low back pain (LBP) in rowers, there are few studies investigating changes in lumbar muscle activation in rowers with a recent history of LBP. Such knowledge is relevant to understand potential mechanisms contributing to the maintenance and recurrence of LBP in rowers. For the first time, we evaluate the spatial distribution of erector spinae (ES) activity in rowers with and without a recent history of LBP, using a novel application of high-density surface electromyography (HDEMG). Design: Cross-sectional study. Methods: Asymptomatic rowers (N = 10) and rowers with a recent history of LBP (N = 8) performed 7 × 4-min exercise bouts (rowing ergometer) until volitional exhaustion. HDEMG signals were acquired bilaterally over the lumbar ES and the root mean square (RMS) amplitude and entropy were analyzed. In addition, the y-axis coordinate of the barycentre (RMS-map) was used to assess changes in ES spatial activation. Results: As the load increased, rowers with LBP showed higher amplitude (p < 0.01) and less complexity (entropy) of the HDEMG signals (p < 0.001). In addition, rowers with LBP showed opposite displacements of the barycentre, specifically showing a caudal shift of muscle activity at high intensities (p < 0.001). Conclusions: Both the magnitude of activation and distribution of ES activity were altered in rowers with a recent history of LBP. The lower complexity of signals together with the caudal displacements of the barycentre suggest an inefficient recruitment of the ES as the load progressed. Modification of the rowing technique in conjunction with feedback from HDEMG might prove useful in future studies.
AB - Objectives: Despite the high prevalence of low back pain (LBP) in rowers, there are few studies investigating changes in lumbar muscle activation in rowers with a recent history of LBP. Such knowledge is relevant to understand potential mechanisms contributing to the maintenance and recurrence of LBP in rowers. For the first time, we evaluate the spatial distribution of erector spinae (ES) activity in rowers with and without a recent history of LBP, using a novel application of high-density surface electromyography (HDEMG). Design: Cross-sectional study. Methods: Asymptomatic rowers (N = 10) and rowers with a recent history of LBP (N = 8) performed 7 × 4-min exercise bouts (rowing ergometer) until volitional exhaustion. HDEMG signals were acquired bilaterally over the lumbar ES and the root mean square (RMS) amplitude and entropy were analyzed. In addition, the y-axis coordinate of the barycentre (RMS-map) was used to assess changes in ES spatial activation. Results: As the load increased, rowers with LBP showed higher amplitude (p < 0.01) and less complexity (entropy) of the HDEMG signals (p < 0.001). In addition, rowers with LBP showed opposite displacements of the barycentre, specifically showing a caudal shift of muscle activity at high intensities (p < 0.001). Conclusions: Both the magnitude of activation and distribution of ES activity were altered in rowers with a recent history of LBP. The lower complexity of signals together with the caudal displacements of the barycentre suggest an inefficient recruitment of the ES as the load progressed. Modification of the rowing technique in conjunction with feedback from HDEMG might prove useful in future studies.
KW - rowing
KW - low back pain
KW - high-density surface electromyography
KW - erector spinae
UR - http://www.scopus.com/inward/record.url?scp=85069642684&partnerID=8YFLogxK
U2 - 10.1016/j.jsams.2019.07.007
DO - 10.1016/j.jsams.2019.07.007
M3 - Article
SN - 1440-2440
VL - 22
SP - 1206
EP - 1212
JO - Journal of Science and Medicine in Sport
JF - Journal of Science and Medicine in Sport
IS - 11
ER -