Biology of Sport
eISSN: 2083-1862
ISSN: 0860-021X
Biology of Sport
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3/2021
vol. 38
 
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abstract:
Original paper

High-volume intermittent maximal intensity isometric exercise caused great stress, although central motor fatigue did not occur

Giedre Jurgelaitiene
1
,
Andrius Satas
1
,
Agne Cekanauskaite
1
,
Kristina Motiejunaite
1
,
Dovile Valanciene
1
,
Jurate Stanislovaitiene
2
,
Kristina Bradauskiene
2
,
Daiva Majauskiene
3
,
Diana Karanauskiene
3
,
Albertas Skurvydas
4, 5

1.
Institute of Sport Science and Innovations, Lithuanian Sports University, Sporto str. 6, 44221 Kaunas, Lithuania
2.
Department of Coaching Science, Lithuanian Sports University, Sporto str. 6, 44221 Kaunas, Lithuania
3.
Department of Physical and Social Education, Lithuanian Sports University, Sporto str. 6, 44221 Kaunas, Lithuania
4.
Department of Rehabilitation, Physical and Sports Medicine, Faculty of Medicine, Vilnius University, M. K. Čiurlionio str. 21/27, LT-03101, Vilnius, Lithuania
5.
Education Academy, Vytautas Magnus University, Jonavos str. 66 – 310, 44191 Kaunas, Lithuania
Biol Sport. 2021;38(3):315–323
Online publish date: 2020/10/22
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To establish whether very high-volume, high-intensity isometric exercise causes stress to the body and how it affects peripheral and central fatigue. Nineteen physically active healthy male subjects(21.2 ± 1.7 years; height – 1.82 ± 0.41 m, body weight – 79.9 ± 4.5 kg; body mass index – 24.3 ± 2.1 kg/m2 ) volunteered to participate in this study. They participated in two experiments 3–5 days apart. Each experiment comprised six series of 60-s maximum voluntary contraction (MVC) force (knee extension) achieved as rapidly as possible. This very high-volume, high-intensity exercise (HVHIE) was performed at different quadriceps muscle lengths: short (SL) and long (LL). The MVC and the electrically stimulated contractile properties of the muscle were measured prior to HVHIE, immediately after and 3 min after each series, and at 3, 10, and 30 min after the end of HVHIE. We found that HVHIE caused high levels of stress (cortisol levels approximately doubled, heart rate and the root mean square successive difference of interval (RMSSD) decreased by about 75%); lactate increased to 8–11 mmol/L, voluntary and 100 Hz stimulation-induced force (recorded immediately after HVHIE) decreased by 55% at LL and 40% at SL. However, the central activation ratio during MVC did not change after either exercise. Isometric HVHIE performed using one leg caused high levels of stress (RMSSD decreased, cortisol increased after HVHIE equally at SL and LL; La increased more while exercising at LL) and the voluntary and electrostimulation-induced muscle force significantly decreased, but muscle central activation during MVC did not decrease.
keywords:

High-volume, High-intensity isometric exercise, Physiological stress, Peripheral and central fatigue, Rate of force development, Muscle length

 
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