| Full text | |
| Author(s): |
Camata, Thiago V.
[1]
;
Altimari, Leandro R.
[1, 2, 3]
;
Bortolotti, Henrique
[1]
;
Dantas, Jose L.
[1, 2, 3]
;
Fontes, Eduardo B.
[1, 2, 3]
;
Smirmaul, Bruno P. C.
[1, 2, 3]
;
Okano, Alexandre H.
[1, 2, 3]
;
Chacon-Mikahil, Mara P. T.
[4]
;
Moraes, Antonio C.
[1, 2]
Total Authors: 9
|
| Affiliation: | [1] State Univ Londrina UEL, Grp Study & Res Neuromuscular Syst & Exercise, CEFE, GEPESINE, Londrina - Brazil
[2] Univ Estadual Campinas, GPNeurom, Lab Electromyog Studies, Fac Phys Educ, Campinas, SP - Brazil
[3] Fed Univ Alagoas UFAL, GEPEBIEX, Phys Educ Ctr Educ, Grp Study & Res Integrat Biol Exercise, Alagoas - Brazil
[4] Univ Estadual Campinas, Fisex Lab Exercise Physiol, Fac Phys Educ, Campinas, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF STRENGTH AND CONDITIONING RESEARCH; v. 25, n. 9, p. 2537-2543, SEP 2011. |
| Web of Science Citations: | 9 |
| Abstract | |
Camata, TV, Altimari, LR, Bortolotti, H, Dantas, JL, Fontes, EB, Smirmaul, BPC, Okano, AH, Chacon-Mikahil, MPT, and Moraes, AC. Electromyographic activity and rate of muscle fatigue of the quadriceps femoris during cycling exercise in the severe domain. J Strength Cond Res 25(9): 2537-2543, 2011-This study compared the activation pattern and the fatigue rate among the superficial muscles of the quadriceps femoris (QF) during severe cycling exercise. Peak oxygen consumption ((V) over dotO(2)peak) and maximal accumulated oxygen Deficit (MAOD) were established by 10 well-trained male cyclists (27.5 +/- 4.1 years, 71.0 +/- 10.3 kg, 173.4 +/- 6.6 cm, mean (V) over dotO(2)peak 56.7 +/- 4.4 ml.kg(-1).min(-1), mean MAOD 5.7 +/- 1.1 L). Muscle activity (electromyographic {[}EMG] signals) was obtained during the supramaximal constant workload test (MAOD) and expressed by root mean square (RMS) and median frequency (MF slope). The RMS of the QF, vastus lateralis (VL) and vastus medialis (VM) muscles were significantly higher than at the beginning after 75% of exercise duration, whereas for the rectus femoris (RF), this was observed after 50% of exercise duration (p <= 0.05). The slope of the MF was significantly higher in the RF, followed by the VL and VM (-3.13 +/- 0.52 vs. -2.61 +/- 0.62 vs. -1.81 +/- 0.56, respectively; p < 0.05). We conclude that RF may play an important role in limiting performance during severe cycling exercise. (AU) | |