Basic characteristics of explanatory factors for LBP in sports science students of Ljubljana University Faculty of Sports; n=54_
| Group of factors | Factor | Category | Count (%) | Mean±SD |
|---|---|---|---|---|
| BIOCHEMICAL FACTORS | ||||
| Iron [μmol/L] | 18.5±6.6 | |||
| Ferritin [μg/L] | 51.6±29.1 | |||
| Ferritin level | Normal | 37 (68.5%) | ||
| Low | 17 (31.5%) | |||
| Haemoglobin [g/L] | 141.7±14.7 | |||
| PHYSICAL FITNESS FACTORS | ||||
| Balance | Overall PSV left [mm/s] | 38.4±9.1 | ||
| Overall PSV right [mm/s] | 37.2±8.6 | |||
| AP PSV left [mm/s] | 23.8±5.8 | |||
| AP PSV right [mm/s] | 23.2±5.8 | |||
| ML PSV left [mm/s] | 25.6±6.4 | |||
| ML PSV right [mm/s] | 24.6±5.8 | |||
| Vertical jump | SJ height [cm] | 27.0.0±5.0 | ||
| SJ power [W/kg] | 48.1±7.4 | |||
| CMJ height [cm] | 30.0±7.0 | |||
| CMJ power [W/kg] | 47.1±7.7 | |||
| Trunk strength | Extension [Nm] | 229.1±98.1 | ||
| Flexion [Nm] | 181.4±79.5 | |||
| Lateral flexion left [Nm] | 162.9±70.3 | |||
| Lateral flexion right [Nm] | 161.3±75.0 | |||
| Knee strength | Extension left [N] | 193.8±55.1 | ||
| Extension right [N] | 184.1±54.9 | |||
| Flexion left [N] | 106.9±32.6 | |||
| Flexion right [N] | 112.4±35.7 | |||
| Ankle strength | Plantar flexion [N] | 250.5±83.1 | ||
| Plantar flexion left [N] | 126.5±43.2 | |||
| Plantar flexion right [N] | 124.9±41.2 | |||
| Dorsal flexion [N] | 75.1±28.5 | |||
| Dorsal flexion left [N] | 34.3±15.0 | |||
| Dorsal flexion right [N] | 41.2±13.9 | |||
| WORKLOAD AND SLEEP FACTORS | ||||
| Training (h) | 8.9±5.3 | |||
| Practical courses (h) | 8.0±3.0 | |||
| Sleep quantity (h) | 6.9±0.7 | |||
| Sleep deficit | No | 24 (44.5%) | ||
| Yes | 30 (55.6%) | |||
| Sleep quality (VAS) | 6.3±1.5 | |||
| PREVIOUS INJURY FACTORS | ||||
| Previous LBP | No | 35 (64.8%) | ||
| Yes | 19 (35.2%) | |||
| Previous knee injury | No | 47 (87.0%) | ||
| Yes | 7 (13.0%) |
Basic characteristics of participants of the study of factors associated with LBP in sports science students of Ljubljana University Faculty of Sports; n=54_
| Characteristic | Category | Count (%) | Mean±SD |
|---|---|---|---|
| Sex | Females | 25 (46.3%) | |
| Males | 29 (53.7%) | ||
| Age (years) | 19.1±0.6 | ||
| BMI (kg/m2) | 22.4±2.2 | ||
| BMI | Normal weight | 47 (87.0%) | |
| Overweight | 7 (13.0%) |
Results of multivariate analysis of relationship between LBP and different explanatory factors in sports science students adjusted for BMI and sex; n=54_
| Factor | Category | OR (95% CI for OR) | p |
|---|---|---|---|
| Ferritin level | Normal | 1.00 | 0.008 |
| Low | 8.70 (1.78-42.60) | ||
| Previous LBP | No | 1.00 | 0.006 |
| Yes | 8.69 (1.94-38.98) |
Results of univariate analysis of relationship between LBP and different explanatory factors in sports science students of Ljubljana University Faculty of Sports; n=54_
| Group of factors | Factor | Category | OR (95% CI for OR) | p |
|---|---|---|---|---|
| BIOCHEMICAL FACTORS | Iron [μmol/L] | 0.98 (0.91-1.08) | 0.764 | |
| Ferritin [μg/L] | 0.99 (0.97-1.01) | 0.282 | ||
| Ferritin level | Normal | 1.00 | 0.043 | |
| Low | 3.50 (1.04-11.77) | |||
| Haemoglobin [g/L] | 0.98 (0.94-1.02) | 0.232 | ||
| PHYSICAL FITNESS FACTORS | ||||
| Balance | Overall PSV left [mm/s] | 0.99 (0.94-1.06) | 0.928 | |
| Overall PSV right [mm/s] | 0.98 (0.92-1.05) | 0.611 | ||
| AP PSV left [mm/s] | 1.01 (0.92-1.12) | 0.779 | ||
| AP PSV right [mm/s] | 0.98 (0.89-1.08) | 0.684 | ||
| ML PSV left [mm/s] | 0.98 (0.89-1.07) | 0.655 | ||
| ML PSV right [mm/s] | 0.97 (0.87-1.07) | 0.549 | ||
| Vertical jump | SJ height [cm] | 0.00 (0.00-2.19) | 0.068 | |
| SJ power [W/kg] | 0.93 (0.85-1.01) | 0.098 | ||
| CMJ height [cm] | 0.00 (0.00-1.16) | 0.054 | ||
| CMJ power [W/kg] | 0.92 (0.84-0.99) | 0.044 | ||
| Trunk strength | Extension [Nm] | 0.99 (0.99-1.00) | 0.059 | |
| Flexion [Nm] | 0.99 (0.98-0.99) | 0.030 | ||
| Lateral flexion left [Nm] | 0.99 (0.99-1.01) | 0.451 | ||
| Lateral flexion right [Nm] | 0.99 (0.99-1.00) | 0.170 | ||
| Knee strength | Extension left [N] | 0.99 (0.98-1.00) | 0.096 | |
| Extension right [N] | 0.99 (0.98-1.00) | 0.103 | ||
| Flexion left [N] | 0.98 (0.96-0.99) | 0.026 | ||
| Flexion right [N] | 0.98 (0.96-1.00) | 0.045 | ||
| Ankle strength | Plantar flexion [N] | 0.99 (0.98-1.02) | 0.687 | |
| Plantar flexion left [N] | 0.99 (0.96-1.04) | 0.769 | ||
| Plantar flexion right [N] | 0.99 (0.95-1.04) | 0.724 | ||
| Dorsal flexion [N] | 0.99 (0.99-1.00) | 0.093 | ||
| Dorsal flexion left [N] | 0.99 (0.98-1.00) | 0.115 | ||
| Dorsal flexion right [N] | 0.99 (0.97-1.00) | 0.086 | ||
| WORKLOAD AND SLEEP FACTORS | ||||
| Training (h) | 0.99 (0.98-1.01) | 0.842 | ||
| Practical courses (h) | 1.02 (0.99-1.04) | 0.144 | ||
| Sleep quantity (h) | 0.57 (0.23-1.41) | 0.221 | ||
| Sleep deficit | No | 1.00 | 0.087 | |
| Yes | 2.91 (0.86-9.86) | |||
| Sleep quality (VAS) | 0.77 (0.51-1.16) | 0.218 | ||
| PREVIOUS INJURY FACTORS | ||||
| Previous LBP | No | 1.00 | 0.007 | |
| Yes | 5.50 (1.61-18.84) | |||
| Previous knee injury | No | 1.00 | 0.775 | |
| Yes | 0.78 (0.14-4.45) | |||
| CONFOUNDING FACTORS | ||||
| Sex | Males | 1.00 | 0.127 | |
| Females | 2.47 (0.77-7.88) | |||
| BMI | Overweight | 1.00 | 0.275 | |
| Normal weight | 0.29 (0.03-2.65) |