Utilizing the RPE-Clamp model to examine interactions among factors associated with perceived fatigability and performance fatigability in women and men

Smith, R. Scott; Housh, Terry J.; Arnett, Jocelyn E.; Anders, John Paul V.; Neltner, Tyler J.; Ortega, Dolores G.; Schmidt, Richard J.; Johnson, Glen O.

doi:10.1007/s00421-023-05163-x

Cited by 1 publication

(9 citation statements)

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“…Theoretically, it is possible to predict force production (% MVIC) based on the RPE scale (i.e., OMNI-RES) because of a proportional relationship between RPE and % MVIC force output (34,45). During phase 1, the initial forces at the beginning of HTF underestimated the expected force values both at RPE 3 (30% MVIC) and RPE 7 (70% MVIC).…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, previous studies (43–45) have reported rapid decreases in force, followed by a plateau phase and eventual precipitous drop in force near the end of tasks performed with an RPE-clamp. It is not clear whether a plateau phase in force adjustments is consistent across all RPE-clamp tasks (43–45) and, if a plateau is displayed, what the relative intensity is relative to CF. The purpose of this exploratory study was to compare TTF, PF, and the time course of changes in force (relative to CF) as well as MMG AMP, MMG MPF, and % SmO 2 between isometric handgrip HTF anchored to RPE 3 and 7.…”

Section: Introductionmentioning

confidence: 89%

“…When an exercise was anchored to RPE, it was revealed that MMG AMP and MMG MPF tracked the RPE (unvarying) (27,43). The unvarying MMG AMP response may reflect a decrease in contractile efficiency (i.e., greater motor unit recruitment to meet the force demand) because of the unique aspects of the RPE-clamp model that requires individuals to reduce force outputs across time to maintain the prescribed RPE levels (27,(42)(43)(44)(45). That is, despite reductions in force, motor unit recruitment remained unchanged (27,43), suggesting greater levels of recruitment were required for a given force.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to neuromuscular measurements, near-infrared spectroscopy (NIRS) may be used to examine potential alterations in blood flow and muscle oxygenation during an exercise anchored to RPE (44,45). NIRS measures muscle oxygen saturation (SmO 2 ) during exercise, and the capacity of microvascular oxygen delivery associated with blood flow is a crucial determinant of oxygen utilization and an accumulation of metabolic byproducts (6,17,28).…”

Section: Introductionmentioning

confidence: 99%

“…However, it is not clear how the alterations in force to maintain an RPE influence % SmO 2 in the muscle. The examination of SmO 2 may provide insights into the effect peripheral fatigue has on force output at given intensities by assessing the potential alterations in blood flow and SmO 2 in active muscles (44,45).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Force, Neuromuscular, and Metabolic Responses During Sustained, Isometric Handgrip Holds to Failure Anchored to Low and High Perceptual Intensities in Men: An Exploratory Study

Kwak,

Succi,

Benitez

et al. 2024

Journal of Strength &Amp; Conditioning Research

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Kwak, M, Succi, PJ, Benitez, B, Mitchinson, C, Samaan, MA, Abel, MG, and Bergstrom, HC. Comparison of force, neuromuscular, and metabolic responses during sustained, isometric handgrip holds to failure anchored to low and high perceptual intensities in men: An exploratory study. J Strength Cond Res 38(8): e405–e416, 2024—This study examined the responses of force alterations, relative to critical force (CF), neuromuscular parameters, and muscle oxygenation (SmO2) for isometric handgrip holds to failure (HTF) anchored to ratings of perceived exertion (RPE) of 3 and 7. Twelve men completed pre-maximal voluntary isometric contractions (pre-MVIC), submaximal HTF at 4 percentages of pre-MVIC, HTF at RPE = 3 and 7, and post-MVIC. Mechanomyograpic (MMG) signals and SmO2 were recorded during the RPE HTF. Analyses included paired-samples t-tests and repeated-measures ANOVAs at an alpha level of p ≤ 0.05. Time to task failure was not different between RPE 3 (478.7 ± 196.6 s) and RPE 7 (495.8 ± 173.8 s). Performance fatigability (PF) and MMG amplitude (AMP) were greater for RPE 7 (PF: 37.9 ± 12.9%; MMG AMP: 15.7 ± 7.4% MVIC) than RPE 3 (PF: 30.0 ± 14.5%; MMG AMP: 10.2 ± 6.5% MVIC), but MMG mean power frequency (MPF) was greater for RPE 3 (146.2 ± 31.1% MVIC) than RPE 7 (128.8 ± 23.0% MVIC). There were RPE-dependent decreases in force (p ≤ 0.01) across 3 discernable phases during the HTF. There were decreases in MMG AMP across time for both RPEs, but there were no significant changes in MMG MPF or SmO2. There were overall similar motor unit control strategies and local metabolic demand between RPEs. The majority of the HTF performed below CF at RPE 3 and 7 indicated CF did not reflect the highest sustainable force. When prescribing isometric exercise anchored to RPE, practitioners should be aware of the magnitude of force loss and relative intensity of the task to be sure desired training loads are met.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%