Neuromuscular responses to mild-muscle damaging eccentric exercise in a low glycogen state.

Authors: Gavin, J.P., Myers, S.D. and Willems, M.E.T.

Journal: J Electromyogr Kinesiol

Volume: 25

Issue: 1

Pages: 53-60

eISSN: 1873-5711

DOI: 10.1016/j.jelekin.2014.10.005

Abstract:

The aim of this study was to examine the effect of low muscle glycogen on the neuromuscular responses to maximal eccentric contractions. Fourteen healthy men (22 ± 3 years) performed single-leg cycling (20 min at ~75% maximal oxygen uptake (V̇O2 max); eight 90 s sprints at a 1:1 work-to-rest ratio (5% decrements from 90% to 55% V̇O2 max until exhaustion) the evening before 100 eccentric (1.57 rads(-1)) with reduced (RED) and normal glycogen (NORM). Neuromuscular responses were measured during and up to 48 h after with maximal voluntary and involuntary (twitch, 20 Hz and 50 Hz) isometric contractions. During eccentric contractions, peak torque decreased (RED: -16.1 ± 2.5%; NORM: -6.2 ± 5.1%) and EMG frequency increased according to muscle length. EMG activity decreased for RED only. After eccentric contractions, maximal isometric force was reduced up to 24h for NORM (-13.5 ± 5.8%) and 48 h for RED (-7.4 ± 10.9%). Twelve hours after eccentric contractions, twitch force and the 20:50 Hz ratio were decreased for RED but not for NORM. Immediate involuntary with prolonged voluntary force loss suggests that reduced glycogen is associated with increased susceptibility to mild muscle-damaging eccentric exercise with contributions of peripheral and central mechanisms to be different during recovery.

https://eprints.bournemouth.ac.uk/21609/

Source: PubMed

Neuromuscular responses to mild-muscle damaging eccentric exercise in a low glycogen state

Authors: Gavin, J.P., Myers, S.D. and Willems, M.E.T.

Journal: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY

Volume: 25

Issue: 1

Pages: 53-60

eISSN: 1873-5711

ISSN: 1050-6411

DOI: 10.1016/j.jelekin.2014.10.005

https://eprints.bournemouth.ac.uk/21609/

Source: Web of Science (Lite)

Neuromuscular responses to mild-muscle damaging eccentric exercise in a low glycogen state.

Authors: Gavin, J.P., Myers, S.D. and Willems, M.E.T.

Journal: Journal of Electromyography and Kinesiology

Volume: 25

Issue: 1

Pages: 53-60

Publisher: Elsevier

DOI: 10.1016/j.jelekin.2014.10.005

https://eprints.bournemouth.ac.uk/21609/

http://www.elsevier.com/

Source: Manual

Neuromuscular responses to mild-muscle damaging eccentric exercise in a low glycogen state.

Authors: Gavin, J.P., Myers, S.D. and Willems, M.E.T.

Journal: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology

Volume: 25

Issue: 1

Pages: 53-60

eISSN: 1873-5711

ISSN: 1050-6411

DOI: 10.1016/j.jelekin.2014.10.005

Abstract:

The aim of this study was to examine the effect of low muscle glycogen on the neuromuscular responses to maximal eccentric contractions. Fourteen healthy men (22 ± 3 years) performed single-leg cycling (20 min at ~75% maximal oxygen uptake (V̇O2 max); eight 90 s sprints at a 1:1 work-to-rest ratio (5% decrements from 90% to 55% V̇O2 max until exhaustion) the evening before 100 eccentric (1.57 rads(-1)) with reduced (RED) and normal glycogen (NORM). Neuromuscular responses were measured during and up to 48 h after with maximal voluntary and involuntary (twitch, 20 Hz and 50 Hz) isometric contractions. During eccentric contractions, peak torque decreased (RED: -16.1 ± 2.5%; NORM: -6.2 ± 5.1%) and EMG frequency increased according to muscle length. EMG activity decreased for RED only. After eccentric contractions, maximal isometric force was reduced up to 24h for NORM (-13.5 ± 5.8%) and 48 h for RED (-7.4 ± 10.9%). Twelve hours after eccentric contractions, twitch force and the 20:50 Hz ratio were decreased for RED but not for NORM. Immediate involuntary with prolonged voluntary force loss suggests that reduced glycogen is associated with increased susceptibility to mild muscle-damaging eccentric exercise with contributions of peripheral and central mechanisms to be different during recovery.

https://eprints.bournemouth.ac.uk/21609/

Source: Europe PubMed Central

Neuromuscular responses to mild-muscle damaging eccentric exercise in a low glycogen state.

Authors: Gavin, J., Myers, S.D. and Willems, M.E.T.

Journal: Journal of Electromyography and Kinesiology

Volume: 25

Issue: 1

Pages: 53-60

ISSN: 1050-6411

Abstract:

The aim of this study was to examine the effect of low muscle glycogen on the neuromuscular responses to maximal eccentric contractions. Fourteen healthy men (22±3years) performed single-leg cycling (20min at ∼75% maximal oxygen uptake (V̇O2 max); eight 90 s sprints at a 1:1 work-to-rest ratio (5% decrements from 90% to 55% V̇O2 max until exhaustion) the evening before 100 eccentric (1.57rads(-1)) with reduced (RED) and normal glycogen (NORM). Neuromuscular responses were measured during and up to 48h after with maximal voluntary and involuntary (twitch, 20Hz and 50Hz) isometric contractions. During eccentric contractions, peak torque decreased (RED: -16.1±2.5%; NORM: -6.2±5.1%) and EMG frequency increased according to muscle length. EMG activity decreased for RED only. After eccentric contractions, maximal isometric force was reduced up to 24h for NORM (-13.5±5.8%) and 48h for RED (-7.4±10.9%). Twelve hours after eccentric contractions, twitch force and the 20:50Hz ratio were decreased for RED but not for NORM. Immediate involuntary with prolonged voluntary force loss suggests that reduced glycogen is associated with increased susceptibility to mild muscle-damaging eccentric exercise with contributions of peripheral and central mechanisms to be different during recovery.

https://eprints.bournemouth.ac.uk/21609/

Source: BURO EPrints