Reversal of muscle fatigue during 16 h of heavy intermittent cycle exercise

2004 ◽  
Vol 97 (6) ◽  
pp. 2166-2175 ◽  
Author(s):  
H. J. Green ◽  
T. A. Duhamel ◽  
S. Ferth ◽  
G. P. Holloway ◽  
M. M. Thomas ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Muscle Fatigue ◽  
Intermittent Exercise ◽  
Low Frequency ◽  
Quadriceps Muscle ◽  
Stimulation Frequency ◽  
Peak Oxygen Consumption ◽  
Force Frequency ◽  
Reduction In Force ◽  
Before And After

This study examined the effects of extended sessions of heavy intermittent exercise on quadriceps muscle fatigue and weakness. Twelve untrained volunteers (10 men and 2 women), with a peak oxygen consumption of 44.3 ± 2.3 ml·kg−1·min−1, exercised at ∼91% peak oxygen consumption for 6 min once per hour for 16 h. Muscle isometric properties assessed before and after selected repetitions (R1, R2, R4, R7, R12, and R15) were used to quantitate fatigue (before vs. after repetitions) and weakness (before vs. before repetitions). Muscle fatigue at R1 was indicated by reductions ( P < 0.05) in peak twitch force (135 ± 13 vs. 106 ± 11 N) and by a reduction ( P < 0.05) in the force-frequency response, which ranged between ∼53% at 10 Hz (113 ± 12 vs. 52.6 ± 7.4 N) and ∼17% at 50 Hz (324 ± 27 vs. 270 ± 30 N). No recovery of force, regardless of stimulation frequency, was observed during the 54 min between R1 and R2. At R2 and for all subsequent repetitions, no reduction in force, regardless of stimulation frequency, was generally found after the exercise. The only exception was for R2, where, at 20 Hz, force was reduced ( P < 0.05) by 18%. At R15, force before repetitions for high frequencies (i.e., 100 Hz) returned to R1 (333 ± 29 vs. 324 ± 27 N), whereas force at low frequency (i.e., 10 Hz) was only partially ( P < 0.05) recovered (113 ± 12 vs. 70 ± 6.6 N). It is concluded that multiple sessions of heavy exercise can reverse the fatigue noted early and reduce or eliminate weakness depending on the frequency of stimulation.

Females and males do not differ for fatigability, muscle damage and magnitude of the repeated bout effect following maximal eccentric contractions

2020 ◽  
Author(s):  
Christina D. Bruce ◽  
Luca Ruggiero ◽  
Gabriel U. Dix ◽  
Paul D. Cotton ◽  
Chris J McNeil
Keyword(s):  
Muscle Fatigue ◽  
Muscle Damage ◽  
Low Frequency ◽  
Calcium Handling ◽  
High Frequency Stimulation ◽  
Repeated Bout Effect ◽  
Indirect Measure ◽  
Force Depression ◽  
Before And After ◽  
Repeated Bout

Unaccustomed eccentric (ECC) exercise induces muscle fatigue as well as damage and initiates a protective response to minimize impairments from a subsequent bout (i.e., repeated bout effect; RBE). It is uncertain if the sexes differ for neuromuscular responses to ECC exercise and the ensuing RBE. Twenty-six young adults (13 females) performed two bouts (four weeks apart) of 200 ECC maximal voluntary contractions (MVCs) of the dorsiflexors. Isometric (ISO) MVC torque and the ratio of ISO torque in response to low- vs. high-frequency stimulation (10:100Hz) were compared before and after (2-10min and 2, 4, and 7d) exercise. The decline in ECC and ISO MVC torque, and the 10:100Hz ratio following bout one did not differ between sexes (P > 0.05), with reductions from baseline of 31.5 ± 12.3, 24.1 ± 15.4, and 51.3 ± 12.2%, respectively. After bout two, the 10:100Hz ratio declined less (45.0 ± 12.4% from baseline) and ISO MVC torque recovered sooner compared to bout one but no differences between sexes were evident for the magnitude of the RBE (P > 0.05). These data suggest that fatigability with ECC exercise does not differ for the sexes and adaptations that mitigate impairments to calcium handling are independent of sex. NOVELTY BULLETS: • One bout of 200 maximal eccentric dorsiflexor contractions caused equivalent muscle fatigue and damage for females and males • The repeated bout effect observed after a second bout four weeks later also had no sex-related differences • Prolonged low-frequency force depression is promoted as an indirect measure of muscle damage in humans

Plyometric Training Does Not Affect Central and Peripheral Muscle Fatigue Differently in Prepubertal Girls and Boys

2010 ◽  
Vol 22 (4) ◽  
pp. 547-556 ◽  
Author(s):  
Albertas Skurvydas ◽  
Marius Brazaitis
Keyword(s):  
Muscle Fatigue ◽  
Central Fatigue ◽  
Quadriceps Muscle ◽  
Voluntary Activation ◽  
Peripheral Fatigue ◽  
Plyometric Training ◽  
Peripheral Muscle ◽  
Before And After ◽  
Voluntary Contractions ◽  
Prepubertal Girls

The aim of the study was to evaluate the effect of plyometric training (PT) on central and peripheral (muscle) fatigue in prepubertal girls and boys. The boys (n = 13, age 10.3 ± 0.3 years) and girls (n = 13, age, 10.2 ± 0.3 years) performed continuous 2-min maximal voluntary contractions (MVCs) before and after 16 high-intensity PT sessions. PT comprised two training sessions per week of 30 jumps in each session with 20 s between jumps. The greatest effect of PT was on excitation–contraction coupling, (twitch force increased by 323% in boys and 21% in girls) and height of a counter–movement jump (increased by 37% in boys and 38% in girls). In contrast, the quadriceps voluntary activation index, central activation ratio, and MVC did not change significantly after PT. The thickness of the quadriceps muscle increased by 9% in boys and 14% in girls after PT. In conclusion, boys and girls demonstrated similar changes in indicators of central fatigue (50–60% decrease) and peripheral fatigue (45–55% decrease) after MVC before and after PT.

scholarly journals Cardiac Autonomic Modulation in Response to Muscle Fatigue and Sex Differences During Consecutive Competition Periods in Young Swimmers: A Longitudinal Study

2021 ◽  
Vol 12 ◽  
Author(s):  
Matías Castillo-Aguilar ◽  
Pablo Valdés-Badilla ◽  
Tomás Herrera-Valenzuela ◽  
Eduardo Guzmán-Muñoz ◽  
Pedro Delgado-Floody ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Body Fat ◽  
Systolic Pressure ◽  
Low Frequency ◽  
Wingate Test ◽  
Autonomic Modulation ◽  
Cardiac Autonomic Modulation ◽  
Before And After ◽  
Longitudinal Variations ◽  
Mean Pressure

Objective: To study the differences in cardiac autonomic modulation in response to muscle fatigue caused by high-intensity exercise during two consecutive competition periods in young swimmers.Methods: Twenty-six competitive swimmers, selected by their training volume, were separated in two groups, females (n = 12 [46%], age: 13.5 ± 1.4 years) and males (n = 14 [54%], age: 13.9 ± 1.7 years), aged between 10 and 16 years, were evaluated five times as follow: (i) 21 days before the first competition (t-0); (ii) two days before (t-1; t-3); and (iii) two days after (t-2; t-4) of the first and second competitions. Morphological measurements (body mass, percentage of total body fat and height), blood pressure, power, and resting heart rate variability (RR with Polar band) were recorded before and after Wingate test at each time.Results: Body fat was higher in females compared to males. However, no differences were found in other morphological parameters. An intra-subject analysis grouped by sex in cardiovascular parameters shows longitudinal variations in systolic pressure and mean pressure among females. Additionally, females depicted higher, very low frequency (VLF, which is intrinsically generated by the heart and strongly associated with emotional stress) after physical fatigue compared to males at t-1. Further, before the competition, the high frequency (HF) component of HRV (parasympathetic drive) was higher in males than females at t-0 and t-4.Conclusion: Our data revealed that males displayed greater parasympathetic reactivity after an anaerobic muscle fatigue test during their competition periods. Contrarily, females had a less cardiac autonomic modulation when comparing the pre-post Wingate test after two consecutive competition periods.

Effect of Caffeine on Quadriceps Muscle Pain during Acute Cycling Exercise in Low versus High Caffeine Consumers

2009 ◽  
Vol 19 (2) ◽  
pp. 150-161 ◽  
Author(s):  
Rachael C. Gliottoni ◽  
John R. Meyers ◽  
Sigurbjörn Á. Arngrímsson ◽  
Steven P. Broglio ◽  
Robert W. Motl
Keyword(s):  
Oxygen Consumption ◽  
High Intensity ◽  
Muscle Pain ◽  
Acute Exercise ◽  
Quadriceps Muscle ◽  
Cycle Ergometry ◽  
Peak Oxygen Consumption ◽  
Caffeine Ingestion ◽  
College Age ◽  
Future Work

This experiment examined the effect of a moderate dose of caffeine on quadriceps muscle pain during a bout of high-intensity cycling in low- versus high-caffeine-consuming males. College-age men who were low (≤100 mg/day; n = 12) or high (≥400 mg/day; n = 13) habitual caffeine consumers ingested caffeine (5 mg/kg body weight) or a placebo in a counterbalanced order and 1 hr later completed 30 min of cycle ergometry at 75–77% of peak oxygen consumption. Perceptions of quadriceps muscle pain, as well as oxygen consumption, heart rate, and work rate, were recorded during both bouts of exercise. Caffeine ingestion resulted in a statistically significant and moderate reduction in quadriceps muscle-pain-intensity ratings during the 30-min bout of high-intensity cycle ergometry compared with placebo ingestion in both low (d = −0.42) and high (d = −0.55) caffeine consumers. The results suggest that caffeine ingestion is associated with a moderate hypoalgesic effect during high-intensity cycling in college-age men who are low or high habitual caffeine consumers, but future work should consider better defining and differentiating pain and effort when examining the effects of caffeine during acute exercise.

Yoga-Based Guided Relaxation Reduces Sympathetic Activity Judged from Baseline Levels

2002 ◽  
Vol 90 (2) ◽  
pp. 487-494 ◽  
Author(s):  
R. P. Vempati ◽  
Shirley Telles
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Sympathetic Activity ◽  
Low Frequency ◽  
Frequency Component ◽  
High Frequency Component ◽  
Before And After ◽  
Baseline Levels ◽  
Guided Relaxation ◽  
Heart Rate Variability Spectrum

35 male volunteers whose ages ranged from 20 to 46 years were studied in two sessions of yoga-based guided relaxation and supine rest. Assessments of autonomic variables were made for 15 subjects, before, during, and after the practices, whereas oxygen consumption and breath volume were recorded for 25 subjects before and after both types of relaxation. A significant decrease in oxygen consumption and increase in breath volume were recorded after guided relaxation (paired t test). There were comparable reductions in heart rate and skin conductance during both types of relaxation. During guided relaxation the power of the low frequency component of the heart-rate variability spectrum reduced, whereas the power of the high frequency component increased, suggesting reduced sympathetic activity. Also, subjects with a baseline ratio of LF/HF >0.5 showed a significant decrease in the ratio after guided relaxation, while subjects with a ratio ≤0.5 at baseline showed no such change. The results suggest that sympathetic activity decreased after guided relaxation based on yoga, depending on the baseline levels.

scholarly journals Initial Results From SOMMA: Contribution of Mitochondrial Function to Walking and Fitness

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 125-125
Author(s):  
Steve Cummings ◽  
Peggy Cawthon ◽  
Bret Goodpaster ◽  
Russell Hepple ◽  
Nancy W Glynn ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Consumption ◽  
Walking Speed ◽  
Vastus Lateralis ◽  
Quadriceps Muscle ◽  
Peak Oxygen Consumption ◽  
Strongly Correlated ◽  
Treadmill Testing ◽  
Initial Results ◽  
Mitochondrial Capacity

Abstract We hypothesize that the capacity of mitochondria in quadriceps skeletal muscle to generate ATP energy by respirometry (OXPHOS) in biopsies from the vastus lateralis, and in whole quadriceps muscle by 31PMRS (ATPmax) would contribute to 4 and 400m gait speed and to peak oxygen consumption on treadmill testing (VO2peak). In analyses from the first SOMMA participants recruited (N=122), OXPHOS was similarly associated with 4m (r=0.21) and 400 m (r=0.21) walking speed (P&lt;0.01). However, ATPmax was not associated with either 4m or 400m walking speed (r=-0.02 and -0.07 respectively). In contrast both OXPHOS (r=0.43) and ATP max (r=0.35) were more strongly correlated with fitness (VO2 peak). These findings suggest that in older people, the mitochondrial capacity to generate ATP plays an important role walking speed and may be even more important to fitness.

Influence of muscle temperature on the contractile properties of the quadriceps muscle in humans with spinal cord injury

1999 ◽  
Vol 98 (1) ◽  
pp. 31-38 ◽  
Author(s):  
H. L. GERRITS ◽  
A. DE HAAN ◽  
M. T. E. HOPMAN ◽  
L. H. V. VAN DER WOUDE ◽  
A. J. SARGEANT
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Low Frequency ◽  
Quadriceps Muscle ◽  
Contractile Properties ◽  
Muscle Temperature ◽  
Force Frequency ◽  
Cord Injury ◽  
Frequency Relationship ◽  
Relationship Of

Low muscle temperature in paralysed muscles of individuals with spinal cord injury may affect the contractile properties of these muscles. The present study was therefore undertaken to assess the effects of increased muscle temperature on the isometric contractile properties of electrically stimulated paralysed quadriceps muscles. When muscle temperature at a depth of 3 cm was increased from ∼32 °C to ∼36 °C by ultra-short-wave application, the half-relaxation time shortened and low-frequency force responses became less fused, but the maximal rate of increase in force remained unchanged. Heating had no effect upon either force decline or slowing of relaxation during fatiguing contractions. The force–frequency relationship of the paralysed quadriceps muscle was shifted to the right after the muscle was heated. Despite this shift, however, the relationship still resembled that in muscles of non-paralysed individuals, probably due to the unexplained high twitch forces. These results indicate that reduced muscle temperature in spinal-cord-injured individuals may lead to an underestimation of the changes in contractile properties in terms of relaxation rate or the degree of fusion with low-frequency stimulation. In addition, the force–frequency relationship of paralysed muscles does not accurately reflect the magnitude of these changes, even when the muscle is heated, and should therefore be treated with caution.

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