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da Silva, J. C., Ekblom, M., Tarassova, O., Andersson, E., Rönquist, G., Grundström, H. & Arndt, A. (2018). Effect of increasing workload on knee extensor and flexor muscular activity during cycling as measured with intramuscular electromyography.. PLoS ONE, 13(8), Article ID e0201014.
Open this publication in new window or tab >>Effect of increasing workload on knee extensor and flexor muscular activity during cycling as measured with intramuscular electromyography.
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2018 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 8, article id e0201014Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to describe the effect of increasing workload on individual thigh muscle activation during a 20 minute incremental cycling test. Intramuscular electromyographic signals were recorded from the knee extensors rectus femoris, vastus lateralis, vastus medialis and vastus intermedius and the knee flexors semimembranosus, semitendinosus, and the short and long heads of the biceps femoris during increasing workloads. Mean activation levels were compared over the whole pedaling cycle and the crank angles at which onset and offset of activation and peak activity occurred were identified for each muscle. These data were compared between three workloads. EMG activation level significantly increased (p<0.05) with increasing workload in the rectus femoris, vastus medialis, vastus lateralis, vastus intermedius, biceps femoris long head, semitendinosus and semimembranosus but not in the biceps femoris short head. A significant change in activation timing was found for the rectus femoris, vastus lateralis, vastus medialis and semitendinosus. Of the knee flexors only the short head of the biceps femoris had its peak activity during the upstroke phase at the two highest workloads indicating a unique contribution to knee flexion.

National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5379 (URN)10.1371/journal.pone.0201014 (DOI)000440778600023 ()30071032 (PubMedID)
Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2018-09-04
da Silva, J. C., Tarassova, O., Ekblom, M., Andersson, E., Rönquist, G. & Arndt, A. (2016). Quadriceps and hamstring muscle activity during cycling as measured with intramuscular electromyography.. European Journal of Applied Physiology, 116(9), 1807-1817
Open this publication in new window or tab >>Quadriceps and hamstring muscle activity during cycling as measured with intramuscular electromyography.
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2016 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 116, no 9, p. 1807-1817Article in journal (Refereed) Published
Abstract [en]

PURPOSE: The aim of this study was to describe thigh muscle activation during cycling using intramuscular electromyographic recordings of eight thigh muscles, including the biceps femoris short head (BFS) and the vastus intermedius (Vint).

METHODS: Nine experienced cyclists performed an incremental test (start at 170 W and increased by 20 W every 2 min) on a bicycle ergometer either for a maximum of 20 min or to fatigue. Intramuscular electromyography (EMG) of eight muscles and kinematic data of the right lower limb were recorded during the last 20 s in the second workload (190 W). EMG data were normalized to the peak activity occurring during this workload. Statistical significance was assumed at p ≤ 0.05.

RESULTS: The vastii showed a greater activation during the 1st quadrant compared to other quadrants. The rectus femoris (RF) showed a similar activation, but with two bursts in the 1st and 4th quadrants in three subjects. This behavior may be explained by the bi-articular function during the cycling movement. Both the BFS and Vint were activated longer than, but in synergy with their respective agonistic superficial muscles.

CONCLUSION: Intramuscular EMG was used to verify muscle activation during cycling. The activation pattern of deep muscles (Vint and BFS) could, therefore, be described and compared to that of the more superficial muscles. The complex coordination of quadriceps and hamstring muscles during cycling was described in detail.

National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4517 (URN)10.1007/s00421-016-3428-5 (DOI)000384214300018 ()27448605 (PubMedID)
Available from: 2016-08-08 Created: 2016-08-05 Last updated: 2017-11-28Bibliographically approved
Andersson, E. A., Rönquist, G., Oddsson, K., Ekblom, Ö. & Nilsson, J. (2013). Äldre blir starkare av Hälsoprojektet. Svensk Idrottsforskning: Organ för Centrum för Idrottsforskning, 22(1), 25-27
Open this publication in new window or tab >>Äldre blir starkare av Hälsoprojektet
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2013 (Swedish)In: Svensk Idrottsforskning: Organ för Centrum för Idrottsforskning, ISSN 1103-4629, Vol. 22, no 1, p. 25-27Article in journal (Other academic) Published
Abstract [sv]

En god kondition och styrka har samband med förbättrad hälsa, minskad förekomst av flera folksjukdomar samt ökad livslängd. Fysiologiska tester kan vara stimulerande för äldre att följa utvecklingen av sin fysiska kapacitet och för olika aktörer som vill göra hälsoutvärderingar.

National Category
Health Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-3004 (URN)
Available from: 2013-10-25 Created: 2013-10-25 Last updated: 2017-12-06
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1477-6294

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