Fiber Type Composition and Capillary Density in Relation to Submaximal Number of Repetitions in Resistance Exercise

Terzis, Gerasimos; Spengos, Konstantinos; Manta, Panagiota; Sarris, Nickos; Georgiadis, G.

doi:10.1519/jsc.0b013e31816a5ee4

Cited by 31 publications

(43 citation statements)

References 25 publications

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“…A relationship has been shown to exist previously between capillary density and the number of submaximal leg press repetitions to exhaustion, suggesting that a high capillary density positively affects endurance performance (Terzis et al, 2008). However, we did not observe any reduction in the capillary density (cap/mm 2 ) following the 8‐day unloading period.…”

Section: Discussionmentioning

confidence: 87%

Changes in muscle strength and morphology after muscle unloading in Special Forces missions

Thorlund

Jakobsen

Madsen

et al. 2011

Scandinavian Med Sci Sports

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The purpose of the present study was to determine the changes in maximal muscle strength, rapid force capacity, jumping performance and muscle morphology following a Special Forces military operation involving 8 days of muscle unloading. Nine male Special Forces soldiers were tested before (pre) and immediately after (post1) an 8-day simulated special support and reconnaissance (SSR) mission and after 3 h of active recovery (post2). Maximal muscle strength (MVC) and rate of force development (RFD) were measured along with maximal counter movement jump height (JH). Muscle biopsies were obtained from the vastus lateralis at pre and post1. Acute reductions were found in MVC (11%), JH (10%) and RFD (17-22%) after 8 days of muscle unloading (post1) (P≤0.05). Type IIX fiber type area% increased (P≤0.05) at post1 together with a tendency toward increased type IIX fiber type % (P=0.09) and decreased type I fiber type % (P=0.06), suggesting a transition toward a less fatigue-resistant fiber-type profile. In conclusion, short-term unloading during SSR missions led to marked reductions in mechanical muscle function and functional performance, which may be partly explained by the changes in muscle morphology. Future studies should identify intervention strategies to counter-act the observed impairments.

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Section: Discussionmentioning

confidence: 87%

Changes in muscle strength and morphology after muscle unloading in Special Forces missions

Thorlund

Jakobsen

Madsen

et al. 2011

Scandinavian Med Sci Sports

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show abstract

“…Therefore, as no difference was found for the electromyographic parameters, peripheral factors may have influenced fatigue resistance [10, 15]. For example, Terzis et al [15] found a significant correlation (r = 0.70; P = 0.01) between the MNR at 70% 1RM in leg press and capillary density in vastus lateralis cross sectional area in twelve physically activity males.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Terzis et al [15] found a significant correlation (r = 0.70; P = 0.01) between the MNR at 70% 1RM in leg press and capillary density in vastus lateralis cross sectional area in twelve physically activity males. Thus, while Terzis et al [15] did not compare aerobic trained subjects, it is possible to presume that a higher capillary density in runners can lead them to a better ability to extend performance into strength endurance sets.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, a possible explanation for these findings is that peripheral adaptations developed by aerobic training could increase the oxidative capacity due to increases of the capillary and mitochondrial density [11, 16] and oxidative enzymes of the skeletal muscle [11], which could contribute to fatigue delay and to the increased work muscle ability [15]. …”

Section: Discussionmentioning

confidence: 99%

“…It is known that congenital factors can also be involved in the fatigue process, indicating that the ability to delay fatigue can be genetically influenced by some factors such as the positive relationship between a high number of slow twitch muscle fibres [3, 7] as well as capillary density [15] and fatigue resistance, independently of the training background. It is difficult to extract a pure impact of the training background.…”

Section: Discussionmentioning

confidence: 99%

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Maximum Number of Repetitions, Total Weight Lifted and Neuromuscular Fatigue in Individuals With Different Training Backgrounds

Panissa¹,

Neto²,

Júlio³

et al. 2013

Biol Sport

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The aim of this study was to evaluate the performance, as well as neuromuscular activity, in a strength task in subjects with different training backgrounds. Participants (n = 26) were divided into three groups according to their training backgrounds (aerobic, strength or mixed) and submitted to three sessions: (1) determination of the maximum oxygen uptake during the incremental treadmill test to exhaustion and familiarization of the evaluation of maximum strength (1RM) for the half squat; (2) 1RM determination; and (3) strength exercise, four sets at 80% of the 1RM, in which the maximum number of repetitions (MNR), the total weight lifted (TWL), the root mean square (RMS) and median frequency (MF) of the electromyographic (EMG) activity for the second and last repetition were computed. There was an effect of group for MNR, with the aerobic group performing a higher MNR compared to the strength group (P = 0.045), and an effect on MF with a higher value in the second repetition than in the last repetition (P = 0.016). These results demonstrated that individuals with better aerobic fitness were more fatigue resistant than strength trained individuals. The absence of differences in EMG signals indicates that individuals with different training backgrounds have a similar pattern of motor unit recruitment during a resistance exercise performed until failure, and that the greater capacity to perform the MNR probably can be explained by peripheral adaptations.

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Velocity-based resistance training: do women need greater velocity loss to maximize adaptations?

et al. 2022

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Purpose Men and women typically display different neuromuscular characteristics, force–velocity relationships, and differing strength deficit (upper vs. lower body). Thus, it is not clear how previous recommendations for training with velocity-loss resistance training based on data in men will apply to women. This study examined the inter-sex differences in neuromuscular adaptations using 20% and 40% velocity-loss protocols in back squat and bench press exercises. Methods The present study employed an 8-week intervention (2 × week) comparing 20% vs. 40% velocity-loss resistance training in the back squat and bench press exercises in young men and women (~ 26 years). Maximum strength (1-RM) and submaximal-load mean propulsive velocity (MPV) for low- and high-velocity lifts in squat and bench press, countermovement jump and vastus lateralis cross-sectional area were measured at pre-, mid-, and post-training. Surface EMG of quadriceps measured muscle activity during performance tests. Results All groups increased 1-RM strength in squat and bench press exercises, as well as MPV using submaximal loads and countermovement jump height (P < 0.05). No statistically significant between-group differences were observed, but higher magnitudes following 40% velocity loss in 1-RM (g = 0.60) and in low- (g = 1.42) and high-velocity (g = 0.98) lifts occurred in women. Training-induced improvements were accompanied by increases in surface EMG amplitude and vastus lateralis cross-sectional area. Conclusion Similar increases in strength and power performance were observed in men and women over 8 weeks of velocity-based resistance training. However, some results suggest that strength and power gains favor using 40% rather than 20% velocity loss in women.

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Fiber Type Composition and Capillary Density in Relation to Submaximal Number of Repetitions in Resistance Exercise

Cited by 31 publications

References 25 publications

Changes in muscle strength and morphology after muscle unloading in Special Forces missions

Changes in muscle strength and morphology after muscle unloading in Special Forces missions

Maximum Number of Repetitions, Total Weight Lifted and Neuromuscular Fatigue in Individuals With Different Training Backgrounds

Velocity-based resistance training: do women need greater velocity loss to maximize adaptations?

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