Andrew D Townshend1, Melinda M Franettovich Smith2, Mark W Creaby3. 1. School of Exercise Science, Australian Catholic University, Queensland, Australia. Electronic address: andrew.townshend@acu.edu.au. 2. Centre for Musculoskeletal Research, Mary MacKillop Institute for Health Research, Australian Catholic University, Queensland, Australia. 3. School of Exercise Science, Australian Catholic University, Queensland, Australia.
Abstract
OBJECTIVE: To investigate the acute effect of gait retraining aimed at reducing tibial peak positive acceleration (PPA) on energetic cost (VO2). DESIGN: Intervention with a pre/post-test design. SETTING: University biomechanics laboratory. PARTICIPANTS: 12 healthy male runners (23.4 ± 5.3 years, 179.7 ± 4.3 cm, 75.6 ± 9.2 kg). MAIN OUTCOME MEASURES: Tibial PPA and oxygen consumption (VO2) were measured after a five minute baseline run and at the end of a gait retraining session aimed at minimizing tibial PPA. RESULTS: Tibial PPA significantly decreased between baseline and after gait retraining (32.6%, p = 0.007). VO2 significantly increased between the two time periods (9.3%, p = 0.008). There was no correlation between change in tibial PPA and change in VO2 (p = 0.956, r = 0.018). CONCLUSION: Practitioners who aim to reduce injury risk by minimizing tibial PPA in runners need to consider the possible acute effect on performance as a result of changes in VO2. Further investigation is warranted to understand the energetic cost of different kinematic strategies used by individuals.
OBJECTIVE: To investigate the acute effect of gait retraining aimed at reducing tibial peak positive acceleration (PPA) on energetic cost (VO2). DESIGN: Intervention with a pre/post-test design. SETTING: University biomechanics laboratory. PARTICIPANTS: 12 healthy male runners (23.4 ± 5.3 years, 179.7 ± 4.3 cm, 75.6 ± 9.2 kg). MAIN OUTCOME MEASURES: Tibial PPA and oxygen consumption (VO2) were measured after a five minute baseline run and at the end of a gait retraining session aimed at minimizing tibial PPA. RESULTS: Tibial PPA significantly decreased between baseline and after gait retraining (32.6%, p = 0.007). VO2 significantly increased between the two time periods (9.3%, p = 0.008). There was no correlation between change in tibial PPA and change in VO2 (p = 0.956, r = 0.018). CONCLUSION: Practitioners who aim to reduce injury risk by minimizing tibial PPA in runners need to consider the possible acute effect on performance as a result of changes in VO2. Further investigation is warranted to understand the energetic cost of different kinematic strategies used by individuals.
Authors: Bas Van Hooren; Joel T Fuller; Jonathan D Buckley; Jayme R Miller; Kerry Sewell; Guillaume Rao; Christian Barton; Chris Bishop; Richard W Willy Journal: Sports Med Date: 2020-04 Impact factor: 11.136
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