Muscle Strength in Obese Adult Females During Weight Loss

Pargman, David; Feldschuh, Joseph

doi:10.1093/ajcn/20.7.790

Cited by 1 publication

(11 citation statements)

References 5 publications

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“…Four interventions had moderate sample sizes of 30-41 participants (37,41,45,53), and only one intervention (46) investigating muscle strength via 1RM testing had a large sample size (71 participants), albeit that study found no significant results. Additionally, muscle strength was a primary outcome in only 15 (12,30,31,35,37,(39)(40)(41)(42)45,47,48,50,51,53) of the 27 publications included in this review. Of these 15 publications, eight found significant changes in muscle strength in varying muscle groups (30,31,37,(39)(40)(41)(42)50); nine muscle groups showed significant decreases in strength (30,37,39,40,42,50,74), 30 showed no significant change (12,35,37,40,45,47,48,51,53), and three muscle groups showed significant increases in strength (41,…”

Section: Discussionmentioning

confidence: 99%

“…Of the two publications that were excluded from the meta-analysis and analyzed qualitatively instead, knee extensor strength significantly decreased in one publication, which administered a 4-week VLED (50), while there was no significant change reported in the other publication, which also administered a VLED (12 weeks in this instance) (51). This discrepancy may be due to the latter publication (51) being published in 1967 and using different equipment.…”

Section: Isokinetic Dynamometrymentioning

confidence: 92%

“…For the 10 participants on two VLED interventions from one publication (38), significant reductions in body weight (À17.4 [À18.3, À16.6] kg, P < 0.001) and isokinetic knee extensor strength obesity reviews (À14.7 [À20.8, À8.7] N m À1 , P < 0.001) were also apparent, representing a pooled 13.1% decrease from the baseline strength value of 134 ± 8 N m À1 . Of the two publications that were excluded from the meta-analysis and analyzed qualitatively instead, knee extensor strength significantly decreased in one publication, which administered a 4-week VLED (50), while there was no significant change reported in the other publication, which also administered a VLED (12 weeks in this instance) (51). This discrepancy may be due to the latter publication (51) being published in 1967 and using different equipment.…”

Section: Isokinetic Dynamometrymentioning

confidence: 93%

“…Of the nine publications (11 interventions) that measured muscle strength via isokinetic dynamometry, seven investigated knee extensor muscles (34, 38,39,[48][49][50][51], three of these also investigated knee flexor muscles (34, 39,48), and three publications examined the effect of weight loss on quadriceps muscles (52,53), hamstring muscles (52) or elbow flexion (51).…”

Section: Isokinetic Dynamometrymentioning

confidence: 99%

“…Four publications (five interventions) administering a diet involving MER showed no significant changes in knee flexion (34, 39,48) or quadriceps strength (53) as examined via isokinetic dynamometry, which is different from our findings in the meta-analysis of knee extensor strength. A total of two publications investigated isokinetic muscle strength after a VLED intervention (51,52). One publication involving VLED showed a significant decrease in quadriceps strength (52), albeit there were no significant changes in elbow flexion (51) or, as measured in a separate publication, hamstring strength (52), in response to VLED and as assessed via isokinetic dynamometry.…”

Section: Isokinetic Dynamometrymentioning

confidence: 99%

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Effect of diet‐induced weight loss on muscle strength in adults with overweight or obesity – a systematic review and meta‐analysis of clinical trials

et al. 2016

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We conducted a systematic review and meta-analysis to identify how diet-induced weight loss in adults with overweight or obesity impacts on muscle strength. Twenty-seven publications, including 33 interventions, most of which were 8-24 weeks in duration, were included. Meta-analysis of seven interventions measuring knee extensor strength by isokinetic dynamometry in 108 participants found a significant decrease following diet-induced weight loss (-9.0 [95% confidence interval: -13.8, -4.1] N/m, P < 0.001), representing a 7.5% decrease from baseline values. Meta-analysis of handgrip strength from 10 interventions in 231 participants showed a non-significant decrease (-1.7 [-3.6, 0.1] kg, P = 0.070), with significant heterogeneity (I(2) = 83.9%, P < 0.001). This heterogeneity may have been due to diet type, because there was a significant decrease in handgrip strength in seven interventions in 169 participants involving moderate energy restriction (-2.4 [-4.8, -0.0] kg, P = 0.046), representing a 4.6% decrease from baseline values, but not in three interventions in 62 participants involving very-low-energy diet (-0.4 [-2.0, 1.2] kg, P = 0.610). Because of variability in methodology and muscles tested, no other data could be meta-analyzed, and qualitative assessment of the remaining interventions revealed mixed results. Despite varying methodologies, diets and small sample sizes, these findings suggest a potential adverse effect of diet-induced weight loss on muscle strength. While these findings should not act as a deterrent against weight loss, due to the known health benefits of losing excess weight, they call for strategies to combat strength loss - such as weight training and other exercises - during diet-induced weight loss. © 2016 World Obesity.

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