Activation of pelvic floor, lumbar and abdominal musculature during a simulated manual material handling task: a cross-sectional study

Barros, Fernanda Cabegi de; Driusso, Patricia; Roberto, Fernanda; Batistão, Mariana Vieira; Corrêa, Mikaela; Sato, Tatiana de Oliveira

doi:10.1590/1809-2950/20005727032020

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ORIGINAL RESEARCH • Fisioter. Pesqui. 27 (3) • Jul-Sep 2020 • https://doi.org/10.1590/1809-2950/20005727032020 copy

Activation of pelvic floor, lumbar and abdominal musculature during a simulated manual material handling task: a cross-sectional study

Ativação do assoalho pélvico, musculatura lombar e abdominal durante uma tarefa simulada de manuseio de material: um estudo transversal

Activación del diafragma pélvico, de la musculatura lumbar y abdominal durante una actividad simulada de manejo de material: un estudio transversal

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Pelvic floor muscles act synergistically with the abdominal and lumbar muscles contributing to spine and pelvic control. These muscles are activated during activities that increase intra-abdominal pressure, such as manual material handling. The aim of our study was to assess the electrical activity of the lumbar, abdominal and pelvic floor muscles during manual material handling with different loads. This is a cross-sectional study with sixteen nulliparous continent women aged between 18 and 35 years. An electromyographic system was used to evaluate the activation of the multifidus, erector spinal (iliocostal) and abdominal rectus muscles bilaterally (Trigno Wireless®, DelSys®, Boston, USA) and another for the pelvic floor muscles (Thought Technology Ltd, Canadá). Electromyographic data were collected during manual handling of three loads: light (1.5 kg), medium (4.5 kg) and heavy (11.3 kg). Repeated measures ANOVA was applied to compare the activation among loads at a 5% level of significance (α = 0.05). There was a significant increase in the activation of the lumbar and abdominal musculature as the load increases. No difference among loads was found for the pelvic floor muscle activation. Pelvic floor muscles did not increase their activation in function of the load, as occur for the lumbar and abdominal muscles in nulliparous continent women. These findings need to be confirmed for incontinent woman, since it could have clinical implications for designing both occupational tasks and pelvic floor rehabilitation.

Keywords:
Pelvic Floor Muscle; Electromyography; Women’s Health; Ergonomics

Demographic characteristics		mean (SD)
Age (years)		23.2 (4.0)
Weight (kg)		61.7 (9.1)
Height (m)		1.60 (0.1)
Body mass index (kg/m²)		23.0 (2.5)
Contraceptive (years)		4.6 (4.7)
Physical activity index (Baecke)		3.0 (0.7)
Vaginal palpation
	Power (0-5 points)	3.2 (0.9)
	Endurance (seconds)	6.5 (2.4)
	Repeat (number of repetitions)	4.3 (1.2)
	Fast (number of repetitions)	7.9 (1.6)
Manometry (mmHg)
	Rest	42.6 (7.9)
	Contraction	51.8 (23.1)

		Light	Load	Heavy	P
			Medium
Left Iliocostal
	Sustain the load*	0.1 (0.1)	0.1 (0.1)	0.3 (0.1)	0.01
	Handling without rotation	0.5 (0.3)	0.6 (0.3)	0.8 (0.4)	0.10
	Handling with rotation**	0.5 (0.3)	0.7 (0.3)	0.8 (0.4)	<0.01
Right Iliocostal
	Sustain the load^β	0.1 (0.1)	0.1 (0.03)	0.2 (0.1)	0.01
	Handling without rotation^ββ	0.5 (0.3)	0.6 (0.3)	0.7 (0.4)	0.03
	Handling with rotation^βββ	0.4 (0.3)	0.6 (0.4)	0.7 (0.5)	<0.01
Left Multifidus
	Sustain the load ^£	0.1 (0.1)	0.2 (0.1)	0.3 (0.2)	<0.01
	Handling without rotation	0.6 (0.2)	0.7 (0.2)	0.9 (0.3)	0.08
	Handling with rotation ^££	0.6 (0.2)	0.7 (0.2)	1.0 (0.3)	<0.01
Right Multifidus
	Sustain the load^€	0.1 (0.1)	0.2 (0.04)	0.3 (0.1)	<0.01
	Handling without rotation^€€	0.6 (0.3)	0.7 (0.3)	0.9 (0.4)	0.02
	Handling with rotation^€€€	0.5 (0.2)	0.8 (0.3)	0.9 (0.2)	<0.01
Left Abdominal
	Sustain the load	0.2 (0.1)	0.2 (0.1)	0.4 (0.4)	0.19
	Handling without rotation	0.4 (0.3)	0.7 (0.6)	0.6 (0.4)	0.06
	Handling with rotation^α	0.3 (0.3)	0.4 (0.3)	0.9 (0.6)	<0.01
Right Abdominal
	Sustain the load	0.2 (0.1)	0.2 (0.1)	0.4 (0.4)	0.14
	Handling without rotation	0.4 (0.3)	0.7 (0.6)	0.7 (0.5)	0.11
	Handling with rotationµ	0.3 (0.3)	0.5 (0.3)	0.9 (0.7)	0.03
Pelvic Floor
	Sustain the load	2.5 (3.9)	2.7 (3.0)	2.4 (3.1)	0.40
	Handling without rotation	5.9 (9.0)	8.0 (9.4)	8.3 (7.8)	0.22
	Handling with rotation	4.7 (7.5)	4.6 (4.6)	7.8 (9.3)	0.25
Flexion
	Sustain the load	2.2 (8.5)	1.7 (8.5)	-0.5 (8.6)	0.31
	Handling without rotation	22.0 (12.5)	23.0 (15.9)	27.2 (14.9)	0.61
	Handling with rotation^θ	23.9 (11.8)	30.0 (12.7)	31.5 (14.8)	<0.01
Inclination
	Sustain the load	-0.3 (2.2)	-1.0 (2.7)	-0.1 (3.1)	0.65
	Handling without rotation	2.4 (2.2)	3.3 (2.8)	4.3 (2.2)	0.08
	Handling with rotation^θθ	2.5 (2.2)	4.2 (2.4)	5.8 (3.1)	0.03

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[1] Corresponding address: Tatiana de Oliveira Sato - Rodovia Washington Luís, km 235, Monjolinho - São Carlos (SP), Brazil - Zip Code: 13565-905 - E-mail: tatisato@gmail.com