Fatigue after submaximal intensive stretch-shortening cycle exercise

Strojnik, Vojko; Komi, Paavo V.

doi:10.1097/00005768-200007000-00020

Cited by 56 publications

(52 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, our between session ratio reliability was excellent (ICC > 0.92). Therefore, we believe that the D/S ratio was highly sensitive to LFF as supported by others (Strojnik and Komi, 2000;Tubman et al, 1997).…”

Section: Comparisons With Previous Studiessupporting

confidence: 75%

“…We used the D/S ratio to quantify LFF even though others have used higher frequency trains (e.g., Skurvydas et al, 2003;Strojnik and Komi, 2000;Ratkevicius et al, 1998). Single and double pulses were employed in the present study rather than trains because they induce less co-contraction because they are more comfortable, and, therefore, allow a greater intensity of stimulation.…”

Section: Comparisons With Previous Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Iguchi

Baldwin

Boeyink

et al. 2008

Journal of Electromyography and Kinesiology

View full text Add to dashboard Cite

It is well accepted that a low intensity/long duration isometric contraction induces more low frequency fatigue (LFF) compared to a high-intensity/short-duration contraction. However, previous reports examined the intensity/duration of the contraction but did not control the level of fatigue when concluding fatigue is task dependent. The purpose of this study was to determine whether a long duration/low intensity fatiguing contraction would induce greater LFF than a short duration/ high-intensity contraction when the quadriceps muscle was fatigued to similar levels. Eighteen healthy male subjects performed quadriceps contractions sustained at 35% and 65% of maximal voluntary contraction (MVC) on separate days, until the tasks induced a similar amount of fatigue (force generating capacity = 45% MVC). Double pulse torque to single pulse torque ratio (D/S ratio) was obtained before, immediately and 5 min after fatigue along with the electromyographic (EMG) signal from vastus medialis (VM) and rectus femoris (RF). The D/S ratio significantly (p < 0.05) increased by 8.7 ± 8.5% (mean ± SD) and 10.2 ± 9.2% after 35% and 65% tasks, respectively, and remained elevated 5 min into recovery; however, there was no significant difference in ratio between the two sessions immediately or 5 min post-fatigue (p > 0.05) even though the endurance time for the 35% fatigue task (124 ± 39.68 s) was significantly longer (p = 0.05) than that of the 65% task (63 ± 17.73 s). EMG amplitude and median power frequency (MPF) analysis also did not reveal any significant differences between these two sessions after fatigue. These findings indicate that LFF fatigue is fatigue dependent as well as task intensity/duration dependent. These findings assist us in understanding task dependency and muscle fatigue.

show abstract

Section: Comparisons With Previous Studiessupporting

confidence: 75%

Section: Comparisons With Previous Studiesmentioning

confidence: 99%

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Iguchi

Baldwin

Boeyink

et al. 2008

Journal of Electromyography and Kinesiology

View full text Add to dashboard Cite

show abstract

“…More specifically, fatiguing SSC exercise generally leads to an immediate reduction in maximal voluntary contraction (MVC) force and electromyography (EMG) (Avela et al 1999;Skurvydas et al 2000;Kuitunen et al 2002;Millet et al 2003) as well as to reduced reflex sensitivity (Nicol et al 1996;Avela et al 1999). On the other hand, a post exercise increase in maximal voluntary EMG (Strojnik and Komi 2000) and stretch reflex response (Hortoba´gyi et al 1991) have also been reported after short-term SSC exercise (herein <10 min), despite the reduction in the MVC force. These results indicate that the factors underlying the acute post exercise MVC force deficit may vary depending, among others, on the duration and intensity of the SSC exercise.…”

Section: Introductionmentioning

confidence: 92%

Voluntary activation and mechanical performance of human triceps surae muscle after exhaustive stretch-shortening cycle jumping exercise

Kuitunen

Avela

Kyröläinen

et al. 2004

European Journal of Applied Physiology

View full text Add to dashboard Cite

The purpose of this study was to examine neuromuscular factors that may contribute to post exercise force loss and subsequent recovery after exhaustive stretch-shortening cycle (SSC) exercise. Six subjects were fatigued on a sledge apparatus by 100 maximal rebound jumps followed by continuous submaximal jumping until complete exhaustion. Exercise-induced changes in neuromuscular performance were followed up to 7 days post exercise. The total number of jumps in the SSC exercise ranged from 336 to 1392. The SSC exercise induced a significant immediate plantarflexion torque decline of 29, 38 and 44% ( P<0.05) in maximal voluntary contraction and evoked maximal twitch and low-frequency (LF) stimulation, respectively. The higher the number of jumps in the SSC exercise the larger was the post exercise reduction in voluntary activation as well as in contractile force ( r=-0.94, P<0.01, in both). Furthermore, a higher number of jumps augmented a delayed force recovery and late decline in stretch reflex EMG response ( r=-0.94, P<0.01). Clear differences were found in central and peripheral adaptation to the exhaustive SSC exercise between the subjects. The magnitude of post exercise contractile and activation failure as well as the delayed recovery of neuromuscular performance may have been augmented in some subjects due to their high number of jumps in the exercise.

show abstract

“…It does not come from an increase in mechanical work production or from increase in muscular activation. There seems to be no failure of the excitation-contraction coupling, which has been reported for stretch-shortening cycle exercises of short (Strojnik and Komi 2000) and long duration (Nicol et al 1991). Therefore, as there was no increase in EMG as a function of running time, it seems unlikely that increase in muscle fibre recruitment occurs in the present type of running protocol.…”

Section: Discussionmentioning

confidence: 55%

“…Therefore, muscle fatigue would have been more important in these previous studies. Thus, EMG levels would have increased to counteract the failure of the excitation-contraction coupling (Gollhofer et al 1987;Strojnik and Komi 2000) that occurred with muscle fatigue.…”

Section: Discussionmentioning

confidence: 99%

Influence of mechanical and metabolic strain on the oxygen consumption slow component during forward pulled running

Avogadro¹,

Kyröläinen

Belli³

2004

Eur J Appl Physiol

View full text Add to dashboard Cite

The possible influence of increased eccentric mechanical work on the increase in oxygen uptake ( V(.)O(2)) after 3 min of running (Delta V(.)O(2)) was investigated through forward pulled running. Ten subjects ran at individually predetermined constant velocity on a treadmill, while being pulled forward. Ground reaction forces, expired gas and EMGs from leg muscles were collected after 3 min and at the end of the run. V(.)O(2) and mechanical work were then calculated. The amplitude of Delta V(.)O(2) was 138 (139) ml x min(-1) [mean (SD)]. Increased ventilation explained only 8% of Delta V(.)O(2). Stride frequency slightly decreased, inducing a similar decrease in internal work and total mechanical work (all P<0.01), while integrated EMG showed no modifications. It was concluded that Delta V(.)O(2) does not come from either an increase in mechanical work production or an increase in muscular activity. Delta V(.)O(2) could come from a lower muscle efficiency that could be due to a modification of fibre type recruitment.

show abstract

Fatigue after submaximal intensive stretch-shortening cycle exercise

Abstract: It was concluded that after submaximal stretch-shortening exercise, the low-frequency fatigue occurred, very likely caused by lower Ca2+ release per single action potential.

Cited by 56 publications

References 20 publications

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Voluntary activation and mechanical performance of human triceps surae muscle after exhaustive stretch-shortening cycle jumping exercise

Influence of mechanical and metabolic strain on the oxygen consumption slow component during forward pulled running

Contact Info

Product

Resources

About