Isometric Strength and Relative Isometric Endurance

Carlson, Brooke; McCraw, Lynn W.

doi:10.1080/10671188.1971.10615067

Cited by 13 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is also surprising as it may be thought that climbers would be able to continue to maintain grip for a greater length of time than nonclimbers. Previous investigations have demonstrated a negative relationship between MVC and relative endurance such that stronger individuals have the lowest isometric endurance and those with lesser maximum strength possess superior relative endurance (Carlson 1969;Carlson and McCraw 1971). Therefore, as climbers seem to be no stronger than sedentary subjects, there are no potential detrimental eects on the ability to maintain sustained contractions, which would be the consequence of a greater strength.…”

Section: Discussionmentioning

confidence: 94%

Arterial blood pressure and forearm vascular conductance responses to sustained and rhythmic isometric exercise and arterial occlusion in trained rock climbers and untrained sedentary subjects

Ferguson

Brown

1997

European Journal of Applied Physiology

112

View full text Add to dashboard Cite

Cardiovascular responses to sustained and rhythmic (5 s on, 2 s off) forearm isometric exercise to fatigue at 40% maximal voluntary contraction (MVC) and to a period of arterial occlusion were investigated in elite rock climbers (CLIMB) as a trained population compared to non-climbing sedentary subjects (SED). Blood pressure (BP), monitored continuously by Finapres, and forearm blood flow, by venous occlusion plethysmography, were measured and used to calculate vascular conductance. During sustained exercise, times to fatigue were not different between CLIMB and SED. However, peak increases in systolic (S) BP were significantly lower in CLIMB [25 (13) mmHg; (3.3 (1.7) kPa] than in SED [48 (17) mmHg; (6.4 (2.3) kPa] (P < 0.05), with a similar trend for increases in diastolic (D) BP. Immediately after sustained exercise, forearm conductance was higher in CLIMB than SED (P < 0.05) for up to 2 min. During rhythmic exercise, times to fatigue were two fold longer in CLIMB than SED [853 (76) vs 420 (69) s, P < 0.05]. Increases in SBP were not different between groups except during the last quarter of exercise when they fell in CLIMB. Conductance both during and after rhythmic exercise was higher in CLIMB than in SED. Following a 10-min arterial occlusion, peak vascular conductance was significantly greater in CLIMB than SED [0.597 (0.084) vs 0.431 (0.035) ml x min(-1) x 100 ml(-1) x mmHg(-1); P < 0.05]. The attenuated BP response to sustained isometric exercise could be due in part to enhanced forearm vasodilatory capacity, which also supports greater endurance during rhythmic exercise by permitting greater functional hyperaemia in between contraction phases. Such adaptations would all facilitate the ability of rock climbers to perform their task of making repetitive sustained contractions.

show abstract

Section: Discussionmentioning

confidence: 94%

Arterial blood pressure and forearm vascular conductance responses to sustained and rhythmic isometric exercise and arterial occlusion in trained rock climbers and untrained sedentary subjects

Ferguson

Brown

1997

European Journal of Applied Physiology

112

View full text Add to dashboard Cite

show abstract

“…Previous studies which have assessed endurance times in non-climbers found a shorter isometric endurance with those who had a greater MVC (Carlson, 1969;Carlson & McCraw, 1971;Ferguson & Brown, 1997). In the current study the absence of this negative relationship between MVC and endurance is more likely caused by the elite group being able to contract for a longer period of time, as opposed to the lower level groups contracting for a shorter period of time.…”

Section: Discussionmentioning

confidence: 99%

Forearm oxygenation and blood flow kinetics during a sustained contraction in multiple ability groups of rock climbers

Fryer¹,

Stoner

Scarrott

et al. 2014

Journal of Sports Sciences

View full text Add to dashboard Cite

DisclaimerThe University of Gloucestershire has obtained warranties from all depositors as to their title in the material deposited and as to their right to deposit such material.The University of Gloucestershire makes no representation or warranties of commercial utility, title, or fitness for a particular purpose or any other warranty, express or implied in respect of any material deposited.The University of Gloucestershire makes no representation that the use of the materials will not infringe any patent, copyright, trademark or other property or proprietary rights.The University of Gloucestershire accepts no liability for any infringement of intellectual property rights in any material deposited but will remove such material from public view pending investigation in the event of an allegation of any such infringement. O2%·s-1 respectively). Furthermore, elite climbers de-oxygenated the flexor carpi radialis significantly (p< 0.05) more, and at a greater rate than the intermediate group (36.5 vs. 14.6%O2 and 0.43 vs. 0.1O2%·s -1 respectively). However, there were no significant differences in total forearm ∆ blood flow. An increased MVC/N is not associated with greater blood flow occlusion in elite climbers therefore, oxidative capacity may be more important for governing performance.

show abstract

“…During the second visit, maximum voluntary isometric contraction (MVIC) was determined and one continuous, fatiguing muscle action was performed to determine the T lim at a randomly ordered percentage of MVIC (30, 45, 60, or 75%). These %MVIC values were selected to be consistent with those used in previous studies that examined endurance times during isometric muscle actions (Carlson and McCraw, 1971;Heyward, 1975). The subsequent three visits were to determine the T lim values for the remaining randomly ordered percentages of MVIC.…”

Section: Subjectsmentioning

confidence: 96%

Comparing electromyographic and mechanomyographic frequency-based fatigue thresholds to critical torque during isometric forearm flexion

Hendrix

Housh

Camic

et al. 2010

Journal of Neuroscience Methods

View full text Add to dashboard Cite

Isometric Strength and Relative Isometric Endurance

Cited by 13 publications

References 7 publications

Arterial blood pressure and forearm vascular conductance responses to sustained and rhythmic isometric exercise and arterial occlusion in trained rock climbers and untrained sedentary subjects

Arterial blood pressure and forearm vascular conductance responses to sustained and rhythmic isometric exercise and arterial occlusion in trained rock climbers and untrained sedentary subjects

Forearm oxygenation and blood flow kinetics during a sustained contraction in multiple ability groups of rock climbers

Comparing electromyographic and mechanomyographic frequency-based fatigue thresholds to critical torque during isometric forearm flexion

Contact Info

Product

Resources

About