Effect of heavy load carriage on cardiorespiratory responses with varying gradients and modes of carriage

Table 1 Physiological responses during load carriage with the DM and CM of the backpack

Parameter	Grade	Mode of carriage (mean ± SD)			% of change
Parameter	Grade	No Load	DM (31.4 kg)	CM (31.4 kg)	NL vs DM	NL vs CM	CM vs DM
HR (beats/min)	−10%	88.00 ± 8.89	107.00 ± 7.00	92.00 ± 5.43	21.59^*	4.55	16.30
	−5%	89.00 ± 8.01	111.00 ± 5.54	92.00 ± 4.91	24.72^*	3.37	20.65^*
	0%	95.00 ± 7.00	121.00 ± 4.67	100.00 ± 5.54	27.37^*	5.26^*	21.00
	5%	111.00 ± 8.31	160.00 ± 13.50	125.00 ± 8.73	44.14^*	12.61^*	28.00^*
	10%	130.00 ± 9.09	183.00 ± 7.48	156.00 ± 8075	40.77^*	20.00^*	17.31
VO₂ [ml/(min·kg)]	−10%	6.64 ± 2.17	9.12.00 ± 3.35	8.24 ± 2.05	37.35^*	24.10	10.68
	−5%	6.76 ± 1.87	9.58 ± 3.85	8.92 ± 2.14	41.72^*	31.95	7.40
	0%	9.45 ± 2.13	13.50 ± 3.39	12.84 ± 2.50	42.86^*	35.87	5.14
	5%	15.14 ± 2.80	22.76 ± 3.57	17.75 ± 1.43	50.33^*	17.24	28.23
	10%	21.12 ± 2.58	30.50 ± 3.63	25.69 ± 4.53	44.41^*	21.64	18.72
EE (kcal/min)	−10%	2.45 ± 0.85	3.29 ± 1.20	2.87 ± 0.68	34.29^*	17.14	14.63
	−5%	2.51 ± 0.79	3.45 ± 1.34	3.11 ± 0.72	37.45^*	23.90	10.93
	0%	3.49 ± 0.90	4.46 ± 1.28	4.43 ± 0.88	27.79^*	26.93	0.68
	5%	5.59 ± 1.15	8.28 ± 1.29	6.26 ± 0.45	48.12^*	11.99	32.27^*
	10%	7.86 ± 1.22	11.61 ± 1.20	9.23 ± 1.27	47.71^*	17.43	25.79^*
RF (breaths/min)	−10%	27.49 ± 5.74	33.51 ± 6.40	31.62 ± 5.76	21.90^*	15.02	5.98^*
	−5%	26.58 ± 4.94	33.38 ± 6.46	32.39 ± 5.98	25.58^*	21.86	3.06^*
	0%	27.51 ± 6.54	34.13 ± 5.77	32.29 ± 6.14	24.06	17.38	5.70^*
	5%	28.51 ± 4.20	37.54 ± 5.18	35.34 ± 4.93	31.67^*	23.96	6.23
	10%	30.57 ± 3.73	44.67 ± 7.16	40.40 ± 5.61	46.12^*	32.16	10.57^*

NL No load, DM Distributed mode, CM Compact mode, HR Heart rate, VO₂ Oxygen consumption, EE Energy expenditure, RF Respiratory frequency; ^*P < 0.05

ISSN: 2054-9369